Article Astronomy & Astrophysics
The flickering radio jet from the quiescent black hole X-ray binary A0620-00
Donna L. dePolo, Richard M. Plotkin, James C. A. Miller-Jones, Jay Strader, Thomas J. Maccarone, Tyrone N. O'Doherty, Laura Chomiuk, Elena Gallo
Summary: This study presents the results of a radio monitoring campaign of A0620 - 00, one of the best-studied and least-luminous known quiescent black hole X-ray binaries. The observations reveal significant variability in the radio emission of A0620 - 00, and the comparison with V404 Cyg suggests that less luminous jets are less variable in quiescence.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)
Add to Collection
Article Astronomy & Astrophysics
Failed-transition outbursts in black hole low-mass X-ray binaries
K. Alabarta, D. Altamirano, M. Mendez, V. A. Cuneo, F. M. Vincentelli, N. Castro-Segura, F. Garcia, B. Luff, A. Veledina
Summary: Black hole low-mass X-ray binaries (BH LMXBs) undergo evolution during outbursts, with common events being 'failed-transition outbursts' (FT outbursts) where the source never reaches the high/soft state. Both FT and full outbursts are driven by the same physical process and initial X-ray data do not distinguish between the two types.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)
Add to Collection
Article Astronomy & Astrophysics
Advection-dominated accretion flow for the varied transition luminosities in black hole X-ray binaries
Jiaqi Li, Erlin Qiao
Summary: This paper re-investigates the transition luminosities in black hole X-ray binaries (BH-XRBs) and derives fitting formulae for the transition rates as functions of the viscosity parameter alpha. The study finds that the value of alpha significantly affects the state transition, suggesting the existence of two classes of alpha values in further exploring the accretion physics in BH-XRBs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)
Add to Collection
Article Astronomy & Astrophysics
Evidence for an expanding corona based on spectral-timing modelling of multiple black hole X-ray binaries
Zheng Cao, Matteo Lucchini, Sera Markoff, Riley M. T. Connors, Victoria Grinberg
Summary: Studying galactic black hole X-ray binaries (BHXBs) provides insight into accretion processes, with the interaction and geometrical similarity of coronas and jets being crucial factors during hard and hard-intermediate states.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)
Add to Collection
Article Astronomy & Astrophysics
The Spin Measurement of MAXI J0637-430: a Black Hole Candidate with High Disk Density
Nan Jia, Ye Feng, Yu-Jia Song, Jun Yang, Jieun Yuh, Pei-Jun Huang, Li-Jun Gou
Summary: We studied the spectral properties of the Galactic black hole candidate MAXI J0637-430 using NuSTAR and Swift/XRT data. By fitting the spectra with a disk component and a powerlaw component model, we found a black hole spin a* > 0.72 and an inclination angle i = 46.1(-5.34)(+4.0) degrees for the accretion disk. The fitting results also suggest an extreme supersolar iron abundance, possibly due to a high-density accretion disk or a strong Fe K alpha emission line. Additionally, a soft excess was observed in the soft state spectral fitting results, which may be caused by free-free heating effect from the high density of the accretion disk. The robustness of black hole spin obtained by X-ray reflection spectroscopy was discussed, showing that the spin results are independent of iron abundance and disk density.
RESEARCH IN ASTRONOMY AND ASTROPHYSICS (2023)
Add to Collection
Article Astronomy & Astrophysics
Global accretion properties of black hole X-ray binaries: A phenomenological perspective
Arghajit Jana
Summary: By collecting spectral data of black hole X-ray binaries (BIIXBs) across different spectral states, the study explores the spectral properties and correlations among different spectral parameters. Interesting correlations and uncertain phenomena are observed in different spectral states.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)
Add to Collection
Article Astronomy & Astrophysics
Type-A quasi-periodic oscillation in the black hole transient MAXI J1348-630
Liang Zhang, Mariano Mendez, Federico Garcia, Yuexin Zhang, Ruican Ma, Diego Altamirano, Zi-Xu Yang, Xiang Ma, Lian Tao, Yue Huang, Shumei Jia, Shuang-Nan Zhang, Jinlu Qu, Liming Song, Shu Zhang
Summary: We present a detailed analysis of the spectral and timing characteristics of a 7-Hz type-A quasi-periodic oscillation (QPO) observed in the black hole X-ray binary MAXI J1348-630 during its high-soft state. The QPO exhibits similar spectral properties as the Comptonized component, suggesting that the variability is driven by the Comptonized region. The phase lags at the QPO frequency are always soft, indicating a softening effect at lower energies. The radiative properties of the type-A QPO can be explained by a vertically extended Comptonized region with a size of about 2300km.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)
Add to Collection
Article Astronomy & Astrophysics
NuSTAR View of the R - Γ Correlation in the Hard State of Black Hole Low-mass X-Ray Binaries
Yanting Dong, Zhu Liu, Xinwu Cao
Summary: The power law and reflection emission in X-ray spectra of black hole X-ray binaries and active galactic nuclei indicate a common physical origin. By analyzing NuSTAR data, a positive correlation is found between the photon index Gamma and the reflection strength R in low-mass black hole X-ray binaries in the hard state, supporting the moving corona model. Comparisons with different theoretical disk-corona models show significant variations in coronal geometry among black hole X-ray binaries. The reflection strength R is smaller in black hole X-ray binaries compared to active galactic nuclei, suggesting more vigorous variations in disk-coronal geometry in the latter.
RESEARCH IN ASTRONOMY AND ASTROPHYSICS (2023)
Add to Collection
Article Astronomy & Astrophysics
Fast transitions of X-ray variability in the black hole transient GX 339-4: comparison with MAXI J1820+070 and MAXI J1348-630
Zi-Xu Yang, Liang Zhang, S. N. Zhang, M. Mendez, Federico Garcia, Yue Huang, Qingcui Bu, He-Xin Liu, Wei Yu, P. J. Wang, L. Tao, D. Altamirano, Jin-Lu Qu, S. Zhang, X. Ma, L. M. Song, S. M. Jia, M. Y. Ge, Q. Z. Liu, J. Z. Yan, T. M. Li, X. Q. Ren, R. C. Ma, Yuexin Zhang, Y. C. Xu, B. Y. Ma, Y. F. Du, Y. C. Fu, Y. X. Xiao, P. P. Li, P. Jin, S. J. Zhao, Q. C. Zhao
Summary: In this paper, we present a broad-band spectral-timing analysis of fast transitions observed in the black hole X-ray binary GX 339-4. The transitions include shifts between band-limited noise-dominated power density spectra and type-B quasi-periodic oscillations, accompanied by rapid appearance or disappearance. Comparative studies with other sources, MAXI J1820+070 and MAXI J1348-630, reveal variations in spectral ratios above and below 10 keV, indicating an association between the appearance of type-B quasi-periodic oscillations and a redistribution of accretion power. The spectral ratios between periods with and without type-B quasi-periodic oscillations differ significantly from ratios between periods with type-B quasi-periodic oscillations and broad-band noise.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)
Add to Collection
Article Astronomy & Astrophysics
The Width-Flux Relation of the Broad Iron Kα Line during the State Transitions of the Black Hole X-Ray Binaries
Hang-Ying Shui, Fu-Guo Xie, Zhen Yan, Ren-Yi Ma
Summary: The study investigates the relation between the normalized intensity and the width of iron lines in black hole X-ray binaries during state transitions. Three scenarios were studied, and it was found that the cloud model best explains the observations. The study also modeled the iron line profiles and found that the cloud model can explain both the line profile and its variation with reasonable parameters.
RESEARCH IN ASTRONOMY AND ASTROPHYSICS (2023)
Add to Collection
Article Astronomy & Astrophysics
Potential origin of the state-dependent high-energy tail in the black hole microquasar Cygnus X-1 as seen with INTEGRAL
F. Cangemi, T. Beuchert, T. Siegert, J. Rodriguez, V Grinberg, R. Belmont, C. Gouiffes, I Kreykenbohm, P. Laurent, K. Pottschmidt, J. Wilms
Summary: Observations of the black hole microquasar Cygnus X-1 in the 0.1-10 MeV range have revealed a high-energy component, believed to be associated with emissions from a compact jet in the hard state and hybrid Comptonization in the soft state. These findings were based on extended data sets, providing better constraints on the properties of the spectral component in both states.
ASTRONOMY & ASTROPHYSICS (2021)
Add to Collection
Article Astronomy & Astrophysics
A variable magnetic disc wind in the black hole X-ray binary GRS 1915+105?
A. Ratheesh, F. Tombesi, K. f*ckumura, P. Soffitta, E. Costa, D. Kazanas
Summary: The study investigated the origin and geometry of the accretion disc wind in GRS 1915+105 using high-resolution spectroscopy, revealing a possible magnetic origin of the wind and a multiple ionisation component. The observed variability in the line flux between soft and hard states is most likely due to a large increase in the wind density, suggesting an intimate link between accretion and ejection processes in black hole binaries.
ASTRONOMY & ASTROPHYSICS (2021)
Add to Collection
Article Astronomy & Astrophysics
Millihertz X-ray variability during the 2019 outburst of black hole candidate Swift J1357.2-0933
Aru Beri, Vishal Gaur, Phil Charles, David R. A. Williams, Jahanvi, John A. Paice, Poshak Gandhi, Diego Altamirano, Rob Fender, David A. Green, David Titterington
Summary: Researchers observed the black-hole candidate X-ray transient Swift J1357.2 - 0933 during its third outburst in 2019, and found millihertz quasi-periodic X-ray oscillations and a similar feature. Spectral analysis showed that the measured X-ray flux was much lower than the peak values observed in previous outbursts. Optical/UV magnitudes correlated with X-ray observations, suggesting X-ray reprocessing as the probable origin of the optical and UV emission. However, the source was not significantly detected in the radio band.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)
Add to Collection
Article Astronomy & Astrophysics
On the energy dependence of the QPO phenomenon in the black hole system MAXI J1535-571
Akash Garg, Ranjeev Misra, Somasri Sen
Summary: Previous analysis of AstroSat observations of the black hole system MAXI J1535-571 reveals the presence of a strong Quasi-Periodic Oscillation (QPO) and its correlation with various spectral parameters. The QPO frequency is found to be correlated with the scattering fraction, accretion rate, and inner disc radii. Modelling the energy-dependent time-lag and r.m.s requires considering the variation of the accretion rate, inner disc radii, and coronal heating rate.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)
Add to Collection
Article Astronomy & Astrophysics
Fast infrared variability from the black hole candidate MAXI J1535-571 and tight constraints on the modelling
F. M. Vincentelli, P. Casella, D. M. Russell, M. C. Baglio, A. Veledina, T. Maccarone, J. Malzac, R. Fender, K. O'Brien, P. Uttley
Summary: This study presents the results of the fast X-ray/infrared variability analysis of the black hole transient MAXI J1535-571, showing a strong asymmetric anticorrelation between X-ray and near-IR light curves. The detection of a near-IR QPO and simultaneous X-ray QPO at approximately the same frequency suggests a possible misalignment between the disc and jet in scenarios for fast IR variability.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)
Add to Collection
Article Astronomy & Astrophysics
Broadband study and the discovery of pulsations from the Be/X-ray binary eRASSU J052914.9-662446 in the Large Magellanic Cloud
C. Maitra, D. Kaltenbrunner, F. Haberl, D. A. H. Buckley, I. M. Monageng, A. Udalski, S. Carpano, J. B. Coley, V. Doroshenko, L. Ducci, C. Malacaria, O. Koenig, A. Santangelo, G. Vasilopoulos, J. Wilms
Summary: In this study, the authors used data from multiple observatories including eROSITA, Swift, and NuSTAR to investigate the timing and spectral properties of a newly discovered high-mass X-ray binary eRASSU J052914.9-662446. They confirmed it as an accreting pulsar with a spin period of 1412 s and identified it as a Be X-ray binary pulsar in the Large Magellanic Cloud through optical spectroscopic observations.
ASTRONOMY & ASTROPHYSICS (2023)
Add to Collection
Article Astronomy & Astrophysics
CATCH: chasing all transients constellation hunters space mission
Panping Li, Qian-Qing Yin, Zhengwei Li, Lian Tao, Xiangyang Wen, Shuang-Nan Zhang, Liqiang Qi, Juan Zhang, Donghua Zhao, Dalin Li, Xizheng Yu, Qingcui Bu, Wen Chen, Yupeng Chen, Yiming Huang, Yue Huang, Ge Jin, Gang Li, Hongbang Liu, Xiaojing Liu, Ruican Ma, Wenxi Peng, Ruijing Tang, Yusa Wang, Jingyu Xiao, Shaolin Xiong, Sheng Yang, Yanji Yang, Chen Zhang, Tianchong Zhang, Liang Zhang, Xuan Zhang, Haisheng Zhao, Kang Zhao, Qingchang Zhao, Shujie Zhao, Xing Zhou
Summary: To address the challenge of discovering a substantial number of transients in time-domain astronomy, we propose an intelligent X-ray constellation called CATCH. It consists of 126 micro-satellites with different capabilities to perform follow-up observations for various types of transients simultaneously. Each satellite carries lightweight X-ray optics and uses a deployable mast to increase the focal length. Controlled by an intelligent system, the satellites can cooperate to perform uninterrupted monitoring, all-sky follow-up observations, and scanning observations with a flexible field of view.
EXPERIMENTAL ASTRONOMY (2023)
Add to Collection
Article Astronomy & Astrophysics
Beam Pattern Evolution of Accreting X-Ray Pulsar 1A 0535+262 during Its 2020 Giant Outburst
Y. F. Hu, L. Ji, C. Yu, P. J. Wang, V. Doroshenko, A. Santangelo, I. Saathoff, S. N. Zhang, S. Zhang, L. D. Kong
Summary: We conducted a pulse profile decomposition analysis on the bright transient X-ray pulsar 1A 0535+262 using Insight-HXMT observations. The observed pulse profile shape can be described by a combination of two symmetric single-pole contributions for a wide range of energies and luminosities. We reconstructed the intrinsic beam patterns of the pulsar and found evidence for a transition between pencil and fan beams in energy ranges above the cyclotron line energy.
ASTROPHYSICAL JOURNAL (2023)
Add to Collection
Article Astronomy & Astrophysics
HESS Follow-up Observations of GRB 221009A
F. Aharonian, F. Ait Benkhali, J. Aschersleben, H. Ashkar., M. Backes., A. Baktash, V. Barbosa Martins, R. Batzofin, Y. Becherini, D. Berge, K. Bernloehr, B. Bi, M. Boettcher, C. Boisson, J. Bolmont, M. de Bony de Lavergne, J. Borowska, M. Bouyahiaoui, F. Bradascio, M. Breuhaus, R. Brose, F. Brun, B. Bruno, T. Bulik, C. Burger-Scheidlin, S. Caroff, S. Casanova, J. Celic, M. Cerruti, T. Chand, S. Chandra, A. Chen, J. Chibueze, O. Chibueze, G. Cotter, S. Dai, J. Damascene Mbarubucyeye, J. Devin, A. Djannati-Atai, A. Dmytriiev, V. Doroshenko, K. Egberts, S. Einecke, J. -P. Ernenwein, S. Fegan, G. Fichet de Clairfontaine, M. Filipovic, G. Fontaine, M. Fuessling, S. Funk, S. Gabici, S. Ghafourizadeh, G. Giavitto, D. Glawion, J. F. Glicenstein, P. Goswami, G. Grolleron, M. -H. Grondin, J. A. Hinton, T. L. Holch, M. Holler, D. Horns, Zhiqiu Huang, M. Jamrozy, F. Jankowsky, V. Joshi, I. Jung-Richardt, E. Kasai, K. Katarzynski, R. Khatoon, B. Khelifi, W. Kluzniak, Nu. Komin, R. Konno, K. Kosack, D. Kostunin, R. G. Lang, S. Le Stum, F. Leitl, A. Lemiere, M. Lemoine-Goumard, J. -P. Lenain, F. Leuschner, T. Lohse, I. Lypova, J. Mackey, D. Malyshev, D. Malyshev, V. Marandon, P. Marchegiani, A. Marcowith, G. Marti-Devesa, R. Marx, M. Meyer, A. Mitchell, L. Mohrmann, A. Montanari, E. Moulin, T. Murach, K. Nakashima, M. de Naurois, J. Niemiec, A. Priyana Noel, P. O'Brien, S. Ohm, L. Olivera-Nieto, E. de Ona Wilhelmi, M. Ostrowski, S. Panny, M. Panter, R. D. Parsons, G. Peron, D. A. Prokhorov, H. Prokoph, G. Puehlhofer, M. Punch, A. Quirrenbach, P. Reichherzer, A. Reimer, O. Reimer, H. Ren, M. Renaud, B. Reville, F. Rieger, G. Rowell, B. Rudak, E. Ruiz-Velasco, V. Sahakian, H. Salzmann, A. Santangelo, M. Sasaki, J. Schaefer, F. Schuessler, H. M. Schutte, U. Schwanke, J. N. S. Shapopi, A. Specovius, S. Spencer, L. Stawarz, R. Steenkamp, S. Steinmassl, C. Steppa, I. Sushch, H. Suzuki, T. Takahashi, T. Tanaka, R. Terrier, N. Tsuji, Y. Uchiyama, M. Vecchi, C. Venter, J. Vink, S. J. Wagner, R. White, A. Wierzcholska, Yu Wun Wong, M. Zacharias, D. Zargaryan, A. A. Zdziarski, A. Zech, S. J. Zhu, N. Zywucka
Summary: GRB 221009A is the brightest gamma-ray burst ever detected. Using H.E.S.S. observations, we derived the upper limits of the energy flux and found consistency with other multiwavelength data. These results contribute to the understanding of the multiwavelength properties of GRB 221009A.
ASTROPHYSICAL JOURNAL LETTERS (2023)
Add to Collection
Article Astronomy & Astrophysics
Search for the evaporation of primordial black holes with HESS
F. Aharonian, F. Ait Benkhali, J. Aschersleben, M. Boettcher, M. Backes, V. Barbosa Martins, R. Batzofin, Y. Becherini, D. Berge, B. Bi, C. Boisson, J. Bolmont, M. de Bony de Lavergne, J. Borowska, F. Bradascio, R. Brose, F. Brun, B. Bruno, T. Bulik, C. Burger-Scheidlin, S. Caroff, S. Casanova, J. Celic, M. Cerruti, T. Chand, A. Chen, O. Chibueze, G. Cotter, J. Damascene Mbarubucyeye, A. Djannati-Atai, K. Egberts, C. van Eldik, J. -P. Ernenwein, M. Fuessling, A. Fiasson, G. Fichet de Clairfontaine, G. Fontaine, S. Gabici, S. Ghafourizadeh, G. Giavitto, D. Glawion, J. F. Glicenstein, G. Grolleron, M. -H. Grondin, L. Haerer, M. Haupt, J. A. Hinton, W. Hofmann, M. Holler, D. Horns, Z. -Q. Huang, M. Jamrozy, F. Jankowsky, V. Joshi, I. Jung-Richardt, E. Kasai, K. Katarzynski, B. Khelifi, S. Klepser, W. Kluzniak, N. Komin, K. Kosack, D. Kostunin, T. L. Holch, R. G. Lang, S. Le Stum, F. Leitl, A. Lemiere, J. -P. Lenain, F. Leuschner, T. Lohse, A. Luashvili, I. Lypova, J. Mackey, D. Malyshev, V. Marandon, P. Marchegiani, P. Marinos, G. Marti-Devesa, R. Marx, A. Mitchell, R. Moderski, L. Mohrmann, A. Montanari, E. Moulin, J. Muller, K. Nakashima, M. de Naurois, J. Niemiec, P. O'Brien, S. Ohm, L. Olivera-Nieto, E. de Ona Wilhelmi, M. Ostrowski, G. Puehlhofer, S. Panny, M. Panter, R. D. Parsons, G. Peron, A. Priyana Noel, D. A. Prokhorov, H. Prokoph, M. Punch, A. Quirrenbach, P. Reichherzer, O. Reimer, F. Rieger, G. Rowell, B. Rudak, H. Rueda Ricarte, V. Sahakian, H. Salzmann, D. A. Sanchez, A. Santangelo, M. Sasaki, H. M. Schutte, U. Schwanke, J. N. S. Shapopi, H. Sol, A. Specovius, S. Spencer, L. Stawarz, R. Steenkamp, S. Steinmassl, C. Steppa, I. Sushch, H. Suzuki, T. Takahashi, T. Tanaka, T. Tavernier, C. Thorpe-Morgan, N. Tsuji, Y. Uchiyama, M. Vecchi, J. Veh, C. Venter, J. Vink, S. J. Wagner, R. White, A. Wierzcholska, Y. W. Wong, M. Zacharias, D. Zargaryan, A. A. Zdziarski, A. Zech, S. Zouari, N. Zywucka
Summary: This paper reports on the search for evaporation bursts of very-high-energy (VHE) gamma rays from primordial black holes (PBHs) using the H.E.S.S. telescopes. The study found that the upper limit on the burst rate of local PBHs is 2000 pc-3 yr-1 for a burst interval of 120 seconds. The implications of these measurements for PBH dark matter are also discussed.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2023)
Add to Collection
Article Astronomy & Astrophysics
New constraints on decaying dark matter from INTEGRAL/SPI
S. Fischer, D. Malyshev, L. Ducci, A. Santangelo
Summary: Based on the data collected by the INTEGRAL's SPI spectrometer over nearly 20 years, constraints on decaying dark matter particles have been presented. The analysis reveals the detection of 32 line-like features, with 29 of them coinciding with known instrumental and astrophysical lines. Additionally, limits on the mixing angle for sterile neutrino dark matter have been reported in relation to the neutrino's mass.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)
Add to Collection
Article Astronomy & Astrophysics
Evolution of disc and corona in MAXI J1348-630 during the 2019 reflare: NICER and Insight-HXMT view
Xiaohang Dai, Lingda Kong, Qingcui Bu, Andrea Santangelo, Shu Zhang, Long Ji, Shuangnan Zhang, Emre Seyit Yorgancioglu
Summary: In this study, the authors analyze the spectral and timing evolution of a source during the first reflare, using observations from Neutron star Interior Composition Explorer and Insight-Hard X-ray Modulation Telescope. They find that below a critical luminosity, the corona shrinks in the radial direction while the inner radius of the disc remains relatively unchanged. However, when the source exceeds the critical luminosity, the inner radius of the disc starts to move inward. They conclude that at low luminosity, the increase in accretion rate only heats up the inner zone of the accretion disc without the transfer of angular momentum observed at higher luminosities.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)
Add to Collection
Article Astronomy & Astrophysics
Timing analysis of Swift J0243.6+6124 with NICER and Fermi/GBM during the decay phase of the 2017-2018 outburst
M. M. Serim, C. K. Donmez, D. Serim, L. Ducci, A. Baykal, A. Santangelo
Summary: We conducted a timing and noise analysis on the Be/X-ray binary system Swift J0243.6+6124 during its 2017-2018 super-Eddington outburst using NICER/XTI observations. By applying a synthetic pulse timing analysis, we expanded the spin frequency history of the source and found that the pulse profiles transition from double-peaked to single-peaked when the X-ray luminosity drops below approximately 7 x10(36) erg s(-1). We suggest that this transition is associated with a change in the magnetic field pattern, which implies a dipolar magnetic field strength of about 5 x10(12) G. Additionally, we analyzed the power density spectra (PDS) of the spin frequency derivative fluctuations and found that the red noise component in the PDS is steeper than other transient accreting sources. We also observed significantly high noise levels above the super-Eddington luminosity levels, possibly due to torque fluctuations caused by interactions with quadrupole fields.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)
Add to Collection
Article Astronomy & Astrophysics
Sensitivity of the Cherenkov Telescope Array to TeV photon emission from the Large Magellanic Cloud
A. Acharyya, R. Adam, A. Aguasca-Cabot, I. Agudo, A. Aguirre-Santaella, J. Alfaro, R. Aloisio, R. Alves Batista, E. Amato, E. O. Anguner, C. Aramo, C. Arcaro, K. Asano, J. Aschersleben, H. Ashkar, M. Backes, A. Baktash, C. Balazs, M. Balbo, J. Ballet, A. Bamba, A. Baquero Larriva, V. Barbosa Martins, U. Barres de Almeida, J. A. Barrio, D. Bastieri, P. Batista, I. Batkovic, J. R. Baxter, J. Becerra Gonzalez, J. Becker Tjus, W. Benbow, E. Bernardini, M. I. Bernardos Martin, J. Bernete Medrano, A. Berti, B. Bertucci, V. Beshley, P. Bhattacharjee, S. Bhattacharyya, C. Bigongiari, A. Biland, E. Bissaldi, F. Bocchino, P. Bordas, J. Borkowski, E. Bottacini, M. Bottcher, F. Bradascio, A. M. Brown, A. Bulgarelli, L. Burmistrov, S. Caroff, A. Carosi, E. Carquin, S. Casanova, E. Cascone, F. Cassol, M. Cerruti, P. Chadwick, S. Chaty, A. Chen, A. Chiavassa, L. Chytka, V. Conforti, J. Cortina, A. Costa, H. Costantini, G. Cotter, S. Crestan, P. Cristofari, F. D'Ammando, M. Dalchenko, F. Dazzi, A. De Angelis, V. De Caprio, E. M. de Gouveia Dal Pino, D. De Martino, M. de Naurois, V. de Souza, M. V. del Valle, A. G. Delgado Giler, C. Delgado, D. della Volpe, D. Depaoli, T. Di Girolamo, A. Di Piano, F. Di Pierro, R. Di Tria, L. Di Venere, S. Diebold, M. Doro, D. Dumora, V. V. Dwarkadas, C. Eckner, K. Egberts, G. Emery, J. Escudero, D. Falceta-Goncalves, E. Fedorova, S. Fegan, Q. Feng, D. Ferenc, G. Ferrand, E. Fiandrini, M. Filipovic, V. Fioretti, L. Foffano, G. Fontaine, Y. f*ckui, D. Gaggero, G. Galanti, G. Galaz, S. Gallozzi, V. Gammaldi, M. Garczarczyk, C. Gasbarra, D. Gasparrini, A. Ghalumyan, M. Giarrusso, G. Giavitto, N. Giglietto, F. Giordano, A. Giuliani, J. -F. Glicenstein, P. Goldoni, J. Goulart Coelho, J. Granot, D. Green, J. G. Green, M. -H. Grondin, O. Gueta, D. Hadasch, P. Hamal, T. Hassan, K. Hayashi, M. Heller, S. Hernandez Cadena, N. Hiroshima, B. Hnatyk, R. Hnatyk, W. Hofmann, J. Holder, M. Holler, D. Horan, P. Horvath, M. Hrabovsky, M. Hutten, M. Iarlori, T. Inada, F. Incardona, S. Inoue, F. Iocco, M. Jamrozy, W. Jin, I. Jung-Richardt, J. Jurysek, D. Kantzas, V. Karas, H. Katagiri, D. Kerszberg, J. Knodlseder, N. Komin, P. Kornecki, K. Kosack, G. Kowal, H. Kubo, A. Lamastra, J. Lapington, M. Lemoine-Goumard, J. -P. Lenain, F. Leone, G. Leto, F. Leuschner, E. Lindfors, T. Lohse, S. Lombardi, F. Longo, R. Lopez-Coto, A. Lopez-Oramas, S. Loporchio, P. L. Luque-Escamilla, O. Macias, P. Majumdar, D. Mandat, S. Mangano, G. Manico, M. Mariotti, P. Marquez, G. Marsella, J. Marti, P. Martin, M. Martinez, D. Mazin, S. Menchiari, D. M. -A. Meyer, D. Miceli, M. Miceli, J. Michalowski, A. Mitchell, R. Moderski, L. Mohrmann, M. Molero, E. Molina, T. Montaruli, A. Moralejo, D. Morcuende, A. Morselli, E. Moulin, V. Moya, R. Mukherjee, K. Munari, A. Muraczewski, S. Nagataki, T. Nakamori, A. Nayak, J. Niemiec, M. Nievas, M. Nikolajuk, K. Nishijima, K. Noda, D. Nosek, B. Novosyadlyj, S. Nozaki, M. Ohishi, S. Ohm, A. Okumura, B. Olmi, R. A. Ong, M. Orienti, R. Orito, M. Orlandini, E. Orlando, S. Orlando, M. Ostrowski, I. Oya, A. Pagliaro, M. Palatka, F. R. Pantaleo, R. Paoletti, J. M. Paredes, N. Parmiggiani, B. Patricelli, M. Pech, M. Pecimotika, M. Persic, O. Petruk, E. Pierre, E. Pietropaolo, G. Pirola, M. Pohl, E. Prandini, C. Priyadarshi, G. Puhlhofer, M. L. Pumo, M. Punch, F. S. Queiroz, A. Quirrenbach, S. Raino, R. Rando, S. Razzaque, A. Reimer, O. Reimer, T. Reposeur, M. Ribo, T. Richtler, J. Rico, F. Rieger, M. Rigoselli, V. Rizi, E. Roache, G. Rodriguez Fernandez, P. Romano, G. Romeo, J. Rosado, A. Rosales de Leon, B. Rudak, C. Rulten, I. Sadeh, T. Saito, M. Sanchez-Conde, H. Sano, A. Santangelo, R. Santos-Lima, S. Sarkar, F. G. Saturni, A. Scherer, P. Schovanek, F. Schussler, U. Schwanke, O. Sergijenko, M. Servillat, H. Siejkowski, C. Siqueira, S. Spencer, A. Stamerra, S. Stanic, C. Steppa, T. Stolarczyk, Y. Suda, T. Tavernier, M. Teshima, L. Tibaldo, D. F. Torres, N. Tothill, M. Vacula, B. Vallage, P. Vallania, C. van Eldik, M. Vazquez Acosta, M. Vecchi, S. Ventura, S. Vercellone, A. Viana, C. F. Vigorito, J. Vink, V. Vitale, V. Vodeb, S. Vorobiov, T. Vuillaume, S. J. Wagner, R. Walter, M. White, A. Wierzcholska, M. Will, R. Yamazaki, L. Yang, T. Yoshikoshi, M. Zacharias, G. Zaharijas, D. Zavrtanik, M. Zavrtanik, A. A. Zdziarski, V. I. Zhdanov, K. Zietara, M. Zivec
Summary: A deep survey of the Large Magellanic Cloud at & SIM;0.1-100 TeV photon energies with the Cherenkov Telescope Array is planned, and the detection prospects and constraints on the nature of dark matter are assessed. The survey will allow for fine spectral studies of known TeV emitters and the detection of additional sources, mainly pulsar-powered objects. The remnants from SN 1987A could be detected depending on the cosmic-ray spectrum and flux increase.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)
Add to Collection
Article Astronomy & Astrophysics
Multiwavelength Observations of the Blazar PKS 0735+178 in Spatial and Temporal Coincidence with an Astrophysical Neutrino Candidate IceCube-211208A
A. Acharyya, C. B. Adams, A. Archer, P. Bangale, J. T. Bartkoske, P. Batista, W. Benbow, A. Brill, J. H. Buckley, J. L. Christiansen, A. J. Chromey, M. Errando, A. Falcone, Q. Feng, G. M. Foote, L. Fortson, A. Furniss, G. Gallagher, W. Hanlon, D. Hanna, O. Hervet, C. E. Hinrichs, J. Hoang, J. Holder, T. B. Humensky, W. Jin, P. Kaaret, M. Kertzman, M. Kherlakian, D. Kieda, T. K. Kleiner, N. Korzoun, S. Kumar, M. J. Lang, M. Lundy, G. Maier, C. E. McGrath, M. J. Millard, J. Millis, C. L. Mooney, P. Moriarty, R. Mukherjee, S. O'Brien, R. A. Ong, M. Pohl, E. Pueschel, J. Quinn, K. Ragan, P. T. Reynolds, D. Ribeiro, E. Roache, I. Sadeh, A. C. Sadun, L. Saha, M. Santander, G. H. Sembroski, R. Shang, M. Splettstoesser, A. Kaushik Talluri, J. V. Tucci, V. V. Vassiliev, A. Weinstein, D. A. Williams, S. L. Wong, J. Woo, F. Aharonian, J. Aschersleben, M. Backes, V. Barbosa Martins, R. Batzofin, Y. Becherini, D. Berge, K. Bernloehr, B. Bi, M. Bottcher, C. Boisson, J. Bolmont, M. de Bony de Lavergne, J. Borowska, M. Bouyahiaoui, F. Bradascio, M. Breuhaus, R. Brose, F. Brun, B. Bruno, T. Bulik, C. Burger-Scheidlin, S. Caroff, S. Casanova, R. Cecil, J. Celic, M. Cerruti, T. Chand, S. Chandra, A. Chen, J. Chibueze, O. Chibueze, G. Cotter, S. Dai, J. Damascene Mbarubucyeye, A. Djannati-Atai, A. Dmytriiev, V. Doroshenko, S. Einecke, J. -P. Ernenwein, G. Fichet de Clairfontaine, M. Filipovic, G. Fontaine, M. Fuessling, S. Funk, S. Gabici, S. Ghafourizadeh, G. Giavitto, D. Glawion, J. F. Glicenstein, P. Goswami, G. Grolleron, L. Haerer, J. A. Hinton, T. L. Holch, M. Holler, D. Horns, M. Jamrozy, F. Jankowsky, V. Joshi, I. Jung-Richardt, E. Kasai, K. Katarzynski, R. Khatoon, B. Khelifi, S. Klepser, W. Kluzniak, K. Kosack, D. Kostunin, R. G. Lang, S. Le Stum, A. Lemiere, J. -P. Lenain, F. Leuschner, T. Lohse, A. Luashvili, I. Lypova, J. Mackey, D. Malyshev, V. Marandon, P. Marchegiani, A. Marcowith, G. Marti-Devesa, R. Marx, A. Mitchell, R. Moderski, L. Mohrmann, A. Montanari, E. Moulin, T. Murach, K. Nakashima, J. Niemiec, A. Priyana Noel, P. O'Brien, L. Olivera-Nieto, E. de Ona Wilhelmi, M. Ostrowski, S. Panny, M. Panter, G. Peron, D. A. Prokhorov, G. Puehlhofer, M. Punch, A. Quirrenbach, P. Reichherzer, A. Reimer, O. Reimer, H. Ren, M. Renaud, F. Rieger, B. Rudak, E. Ruiz-Velasco, V. Sahakian, A. Santangelo, M. Sasaki, J. Schaefer, F. Schuessler, H. M. Schutte, U. Schwanke, J. N. S. Shapopi, A. Specovius, S. Spencer, L. Stawarz, R. Steenkamp, S. Steinmassl, I. Sushch, H. Suzuki, T. Takahashi, T. Tanaka, R. Terrier, C. van Eldik, M. Vecchi, J. Veh, C. Venter, J. Vink, R. White, A. Wierzcholska, Yu Wun Wong, M. Zacharias, D. Zargaryan, A. A. Zdziarski, A. Zech, S. Zouari, N. Zywucka, K. Mori
Summary: We report on multiwavelength target-of-opportunity observations of the blazar PKS 0735+178, located 2 degrees .2 away from the best -fit position of the IceCube neutrino event IceCube-211208A detected on 2021 December 8. The source was in a high -flux state in the optical, ultraviolet, X-ray, and GeV ?-ray bands around the time of the neutrino event. The X-ray and ?-ray measurements provide strong constraints on the leptonic and hadronic models, and suggest the existence of an external photon field in the source.
ASTROPHYSICAL JOURNAL (2023)
Add to Collection
Article Astronomy & Astrophysics
Prospects for annihilating dark matter from M31 and M33 observations with the Cherenkov Telescope Array
Miltiadis Michailidis, Lorenzo Marafatto, Denys Malyshev, Fabio Iocco, Gabrijela Zaharijas, Olga Sergijenko, Maria Isabel Bernardos, Christopher Eckner, Alexey Boyarsky, Anastasia Sokolenko, Andrea Santangelo
Summary: This paper presents studies on the expected sensitivity of the Cherenkov Telescope Array (CTA) to the annihilation signal of weakly interacting massive particles from M31 and M33. The research shows that a 100-hour observation campaign by CTA can improve the current limits on annihilation cross-sections by an order of magnitude and potentially detect the extended emission from the bulge of M31.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2023)
Add to Collection
Article Astronomy & Astrophysics
The mHz quasi-regular modulations of 4U 1630-47 during its 1998 outburst
Q. C. Zhao, H. X. Yin, L. Tao, Z. X. Yang, J. L. Qu, L. Zhang, S. Zhang, E. L. Qiao, Q. C. Bu, S. J. Zhao, P. P. Li, Y. M. Huang, R. C. Ma, R. J. Tang, P. Jin, W. Yu, H. X. Liu, Y. Huang, X. Ma, J. Y. Xiao, X. Zhang, K. Zhao
Summary: This study presents a detailed analysis of the quasi-regular modulation (QRM) phenomenon in the black hole X-ray binary 4U 1630-47 during its 1998 outburst. The QRM is found to be flux dependent and is detected along with low-frequency quasi-periodic oscillations (LFQPOs). The observations are divided into four groups based on the behavior of the power density spectrum, and the energy dependence of QRM and LFQPOs is studied.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)
Add to Collection
Article Astronomy & Astrophysics
Detection of a strong similar to 2.5 Hz modulation in the newly discovered millisecond pulsar MAXI J1816-195
P. P. Li, L. Tao, L. Zhang, Q. C. Bu, J. L. Qu, L. Ji, P. J. Wang, Y. P. Chen, S. Zhang, R. C. Ma, Z. X. Yang, W. T. Ye, S. J. Zhao, Q. C. Zhao, Y. Huang, X. Ma, E. L. Qiao, S. M. Jia, S. N. Zhang
Summary: MAXI J1816-195 is a newly discovered accreting millisecond X-ray pulsar that exhibits a transient modulation during its decay period. The modulation is strongly correlated with spectral hardening and its amplitude increases with energy, indicating it is likely produced in an unstable corona. Reflection features, including a broadened Fe-K line and a Compton hump, are observed in the spectra, suggesting the presence of a disc-corona system. The radius of the inner disc is estimated to be (1.04-1.23) R-ISCO and the magnetic field strength is <= 4.67 x 10(8) G.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2023)
Add to Collection
No Data Available
