scholarly journals Spectral Analysis of the Black Hole Candidate 4U 1630-47

2004 ◽  
Author(s):  
R Saxena
Keyword(s):  
Black Hole ◽  
Spectral Analysis ◽  
Black Hole Candidate

scholarly journals A detailed study on the reflection component for the black hole candidate MAXI J1836−194

2020 ◽  
Vol 493 (2) ◽  
pp. 2178-2187
Author(s):  
Yanting Dong ◽  
Javier A García ◽  
Zhu Liu ◽  
Xueshan Zhao ◽  
Xueying Zheng ◽  
...  
Keyword(s):  
Black Hole ◽  
Spectral Analysis ◽  
Primary Source ◽  
Ionization State ◽  
X Ray ◽  
Black Hole Candidate ◽  
Reflection Model ◽  
Iron Abundance ◽  
Reflection Component ◽  
Ionization Gradient

ABSTRACT We present a detailed spectral analysis of the black hole candidate MAXI J1836−194. The source was caught in the intermediate state during its 2011 outburst by Suzaku and RXTE. We jointly fit the X-ray data from these two missions using the relxill model to study the reflection component, and a steep inner emissivity profile indicating a compact corona as the primary source is required in order to achieve a good fit. In addition, a reflection model with a lamp-post configuration (relxilllp), which is normally invoked to explain the steep emissivity profile, gives a worse fit and is excluded at 99 per cent confidence level compared to relxill. We also explore the effect of the ionization gradient on the emissivity profile by fitting the data with two relativistic reflection components, and it is found that the inner emissivity flattens. These results may indicate that the ionization state of the disc is not constant. All the models above require a supersolar iron abundance higher than ∼4.5. However, we find that the high-density version of reflionx can describe the same spectra even with solar iron abundance well. A moderate rotating black hole (a* = 0.84–0.94) is consistently obtained by our models, which is in agreement with previously reported values.

scholarly journals Inference on accretion flow properties of XTE J1752-223 during its 2009-10 outburst

2020 ◽  
Vol 493 (2) ◽  
pp. 2452-2462 ◽  
Author(s):  
Kaushik Chatterjee ◽  
Dipak Debnath ◽  
Debjit Chatterjee ◽  
Arghajit Jana ◽  
Sandip K Chakrabarti
Keyword(s):  
Black Hole ◽  
Spectral Analysis ◽  
Low Frequency ◽  
Power Law Model ◽  
Flow Properties ◽  
Advective Flow ◽  
Black Hole Candidate ◽  
Two Component ◽  
Timing Properties ◽  
Spectral States

ABSTRACT Spectral and timing properties of the stellar-mass black hole candidate XTE J1752-223 during its 2009-10 outburst are studied using RXTE PCA data in the 2.5–25 keV energy range. Low frequency quasi-periodic oscillations are seen during outburst. The spectral analysis is done using two types of models: one is the combined disc blackbody plus power-law model and the other is Transonic flow solution based Two Component Advective Flow (TCAF) model. Light-curve profiles and evolution of hardness ratios are studied using MAXI GSC and Swift BAT data. Based on the evolution of the temporal and the spectral properties, we find that the object evolved through the following spectral states: hard, hard-intermediate, and soft-intermediate/soft. From the TCAF model fitted spectral analysis, we also estimate the probable mass of the black hole in the range of 8.1−11.9 M⊙, and more precisely, the mass appears to be 10 ± 1.9 M⊙.

scholarly journals Spectral analysis of new black hole candidate AT2019wey observed by NuSTAR

2021 ◽  
Vol 65 (1) ◽  
Author(s):  
Ye Feng ◽  
XueShan Zhao ◽  
LiJun Gou ◽  
YuFeng Li ◽  
James F. Steiner ◽  
...  
Keyword(s):  
Black Hole ◽  
Spectral Analysis ◽  
Black Hole Candidate

scholarly journals Properties of Faint X-ray Activity of XTE J1908+094 in 2019

Galaxies ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 25
Author(s):  
Debjit Chatterjee ◽  
Arghajit Jana ◽  
Kaushik Chatterjee ◽  
Riya Bhowmick ◽  
Sujoy Kumar Nath ◽  
...  
Keyword(s):  
Black Hole ◽  
Temporal Analysis ◽  
Power Density Spectrum ◽  
Periodic Oscillations ◽  
Telescope Array ◽  
Density Spectrum ◽  
X Ray ◽  
Black Hole Candidate ◽  
Short Period ◽  
Spectral State

We study the properties of the faint X-ray activity of Galactic transient black hole candidate XTE J1908+094 during its 2019 outburst. Here, we report the results of detailed spectral and temporal analysis during this outburst using observations from Nuclear Spectroscopic Telescope Array (NuSTAR). We have not observed any quasi-periodic-oscillations (QPOs) in the power density spectrum (PDS). The spectral study suggests that the source remained in the softer (more precisely, in the soft–intermediate) spectral state during this short period of X-ray activity. We notice a faint but broad Fe Kα emission line at around 6.5 keV. We also estimate the probable mass of the black hole to be 6.5−0.7+0.5M⊙, with 90% confidence.

scholarly journals XMM-Newton and INTEGRAL observations of the black hole candidate XTE J1817-330

2007 ◽  
Vol 473 (2) ◽  
pp. 561-568 ◽  
Author(s):  
G. Sala ◽  
J. Greiner ◽  
M. Ajello ◽  
E. Bottacini ◽  
F. Haberl
Keyword(s):  
Black Hole ◽  
Black Hole Candidate

scholarly journals The reflection component in the average and heartbeat spectra of the black hole candidate IGR J17091-3642 during the 2016 outburst

2018 ◽  
Vol 478 (4) ◽  
pp. 4837-4850 ◽  
Author(s):  
Yanan Wang ◽  
Mariano Méndez ◽  
Diego Altamirano ◽  
James Court ◽  
Aru Beri ◽  
...  
Keyword(s):  
Black Hole ◽  
Black Hole Candidate ◽  
Reflection Component

scholarly journals INSIGHT-HXMT Observations of the New Black Hole Candidate MAXI J1535−571: Timing Analysis

2018 ◽  
Vol 866 (2) ◽  
pp. 122 ◽  
Author(s):  
Y. Huang ◽  
J. L. Qu ◽  
S. N. Zhang ◽  
Q. C. Bu ◽  
Y. P. Chen ◽  
...  
Keyword(s):  
Black Hole ◽  
Timing Analysis ◽  
Black Hole Candidate

scholarly journals UNDERSTANDING GALACTIC BLACK HOLE CANDIDATE GRS 1915+105

2002 ◽  
pp. 2279-2288 ◽  
Author(s):  
SANDIP K. CHAKRABARTI ◽  
S.G. MANICKAM ◽  
A. NANDI ◽  
A.R. RAO
Keyword(s):  
Black Hole ◽  
Black Hole Candidate ◽  
Galactic Black Hole
Sign in / Sign up

Export Citation Format

Share Document