Confirming the thermal Comptonization model for black hole X-ray emission in the low-hard state

被引:8
|
作者
Castro, M. [1 ]
D'Amico, F. [1 ]
Braga, J. [1 ]
Maiolino, T. [2 ,3 ]
Pottschmidt, K. [4 ,5 ]
Wilms, J. [6 ,7 ]
机构
[1] INPE, BR-12227010 Sao Jose Dos Campos, Brazil
[2] Univ Ferrara, Phys Earth Sci Dept, I-44122 Ferrara, Italy
[3] Univ Nice Sophia Antipolis, F-06108 Nice, France
[4] NASA GSFC, Cresst, Greenbelt, MD USA
[5] UMBC, Baltimore, MD USA
[6] Univ Erlangen Nurnberg, Remeis Observ, D-96049 Bamberg, Germany
[7] Univ Erlangen Nurnberg, ECAP, D-96049 Bamberg, Germany
来源
ASTRONOMY & ASTROPHYSICS | 2014年 / 569卷
关键词
radiation mechanisms: non-thermal; radiation mechanisms: thermal; X-rays: stars; PHOTON IMAGING CAMERA; 1E; 1740.7-2942; GALACTIC-CENTER; XMM-NEWTON; 1E-1740.7-2942; 1E1740.7-2942; BINARIES; SPECTRUM; REFLECTION; IMAGER;
D O I
10.1051/0004-6361/201323290
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Hard X-ray spectra of black hole binaries in the low/hard state are well modeled by thermal Comptonization of soft seed photons by a corona-type region with kT similar to 50 keV and optical depth around 1. Previous spectral studies of 1E 1740.7-2942, including both the soft and the hard X-ray bands, were always limited by gaps in the spectra or by a combination of observations with imaging and non-imaging instruments. In this study, we have used three rare nearly-simultaneous observations of 1E 1740.7-1942 by both XMM-Newton and INTEGRAL satellites to combine spectra from four different imaging instruments with no data gaps, and we successfully applied the Comptonization scenario to explain the broadband X-ray spectra of this source in the low/hard state. For two of the three observations, our analysis also shows that, models including Compton reflection can adequately fit the data, in agreement with previous reports. We show that the observations can also be modeled by a more detailed Comptonization scheme. Furthermore, we find the presence of an iron K-edge absorption feature in one occasion, which confirms what had been previously observed by Suzaku. Our broadband analysis of this limited sample shows a rich spectral variability in 1E 1740.7 2942 at the low/hard state, and we address the possible causes of these variations. More simultaneous soft/hard X-ray observations of this system and other black-hole binaries would be very helpful in constraining the Comptonization scenario and shedding more light on the physics of these systems.
引用
收藏
页数:6
相关论文
共 50 条
  • [1] High-soft to Low-hard State Transition in Black Hole X-Ray Binaries with GRMHD Simulations
    Dihingia, Indu K.
    Mizuno, Yosuke
    Sharma, Prateek
    [J]. ASTROPHYSICAL JOURNAL, 2023, 958 (02):
  • [2] Detection of low-hard state spectral and timing signatures from the black hole X-ray transient XTE J1650-500 at low X-ray luminosities
    Tomsick, JA
    Kalemci, E
    Kaaret, P
    [J]. ASTROPHYSICAL JOURNAL, 2004, 601 (01): : 439 - 449
  • [3] Energy-dependent timing studies of the low-hard state of black hole X-ray binaries with XMM-Newton
    Stiele, Holger
    Kong, Albert K. H.
    [J]. ASTRONOMISCHE NACHRICHTEN, 2019, 340 (04) : 314 - 318
  • [4] A disk-corona model for the low/hard state of black hole X-ray binaries
    Wang, Jiu-Zhou
    Wang, Ding-Xiong
    Huang, Chang-Yin
    [J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS, 2013, 13 (10) : 1163 - 1180
  • [5] A disk-corona model for the low/hard state of black hole X-ray binaries
    Jiu-Zhou Wang
    Ding-Xiong Wang
    Chang-Yin Huang
    [J]. Research in Astronomy and Astrophysics, 2013, 13 (10) : 1163 - 1180
  • [6] Black hole accretion discs in the canonical low-hard state
    Reis, R. C.
    Fabian, A. C.
    Miller, J. M.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2010, 402 (02) : 836 - 854
  • [7] X-Ray Spectral Correlations in a Sample of Low-mass Black Hole X-Ray Binaries in the Hard State
    You, Bei
    Dong, Yanting
    Yan, Zhen
    Liu, Zhu
    Tuo, Youli
    Yao, Yuanle
    Cao, Xinwu
    [J]. ASTROPHYSICAL JOURNAL, 2023, 945 (01):
  • [8] X-Ray Spectral and Timing Studies of Black Hole Transients in the Hard State at Low Luminosity
    Tomsick, John A.
    Yamaoka, Kazutaka
    Kalemci, Emrah
    Corbel, Stephane
    Kaaret, Philip
    Migliari, Simone
    [J]. SUZAKU 2011: EXPLORING THE X-RAY UNIVERSE: SUZAKU AND BEYOND, 2012, 1427
  • [9] An additional soft X-ray component in the dim low/hard state of black hole binaries
    Chiang, C. Y.
    Done, Chris
    Still, M.
    Godet, O.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2010, 403 (03) : 1102 - 1112
  • [10] On the spectral slopes of hard X-ray emission from black hole candidates
    Ebisawa, K
    Titarchuk, L
    Chakrabarti, SK
    [J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 1996, 48 (01) : 59 - 65