SPECTRAL EVOLUTION IN THE SOFT STATE OF BLACK HOLE BINARY 4U 1630-47

2020 ◽  
Vol 7 (10) ◽  
Keyword(s):  
Black Hole ◽  
Spectral Evolution ◽  
Soft State ◽  
Black Hole Binary

scholarly journals Hysteresis of Spectral Evolution in the Soft State of Black Hole Binary LMC X‐3

2007 ◽  
Vol 669 (2) ◽  
pp. 1138-1142 ◽  
Author(s):  
D. M. Smith ◽  
D. M. Dawson ◽  
J. H. Swank
Keyword(s):  
Black Hole ◽  
Spectral Evolution ◽  
Soft State ◽  
Black Hole Binary

scholarly journals GRS 1758–258: RXTE Monitoring of a Rare Persistent Hard State Black Hole

10.14311/1480 ◽  
2011 ◽  
Vol 51 (6) ◽  
Author(s):  
M. Obst ◽  
K. Pottschmidt ◽  
A. Lohfink ◽  
J. Wilms ◽  
M. Böck ◽  
...  
Keyword(s):  
Black Hole ◽  
State Transitions ◽  
Spectral Evolution ◽  
X Ray ◽  
Soft State ◽  
Hard State ◽  
Long Term Behavior ◽  
X Ray Binaries ◽  
Black Hole Candidates

GRS 1758–258 is the least studied of the three persistent black hole X-ray binaries in our Galaxy. It is also one of only two known black hole candidates, including all black hole transients, which shows a decrease of its 3-10 keV flux when entering the thermally dominated soft state, rather than an increase.We present the spectral evolution of GRS 1758–258 from RXTE-PCA observations spanning a time of about 11 years from 1996 to 2007. During this time, seven dim soft states are detected. We also consider INTEGRAL monitoring observations of the source and compare the long-term behavior to that of the bright persistent black hole X-ray binary Cygnus X-1. We discuss the observed state transitions in the light of physical scenarios for black hole transitions.

scholarly journals Long-Term Monitoring of the Black Hole Binary GX 339−4 in the High/Soft State during the 2010 Outburst with MAXI/GSC

2011 ◽  
Vol 63 (sp3) ◽  
pp. S803-S811 ◽  
Author(s):  
Megumi Shidatsu ◽  
Yoshihiro Ueda ◽  
Satoshi Nakahira ◽  
Hitoshi Negoro ◽  
Kazutaka Yamaoka ◽  
...  
Keyword(s):  
Black Hole ◽  
Soft State ◽  
Black Hole Binary ◽  
Long Term Monitoring ◽  
Term Monitoring

scholarly journals NICER observations reveal that the X-ray transient MAXI J1348−630 is a black hole X-ray binary

2020 ◽  
Vol 499 (1) ◽  
pp. 851-861 ◽  
Author(s):  
L Zhang ◽  
D Altamirano ◽  
V A Cúneo ◽  
K Alabarta ◽  
T Enoto ◽  
...  
Keyword(s):  
Black Hole ◽  
State Transitions ◽  
Spectral Evolution ◽  
X Ray ◽  
Black Hole Candidate ◽  
Soft State ◽  
Intermediate States ◽  
Different Types ◽  
Hard State ◽  
Timing Properties

ABSTRACT We studied the outburst evolution and timing properties of the recently discovered X-ray transient MAXI J1348−630 as observed with NICER. We produced the fundamental diagrams commonly used to trace the spectral evolution, and power density spectra to study the fast X-ray variability. The main outburst evolution of MAXI J1348−630 is similar to that commonly observed in black hole transients. The source evolved from the hard state (HS), through hard- and soft-intermediate states, into the soft state in the outburst rise, and back to the HS in reverse during the outburst decay. At the end of the outburst, MAXI J1348−630 underwent two reflares with peak fluxes approximately one and two orders of magnitude fainter than the main outburst, respectively. During the reflares, the source remained in the HS only, without undergoing any state transitions, which is similar to the so-called ‘failed outbursts’. Different types of quasi-periodic oscillations (QPOs) are observed at different phases of the outburst. Based on our spectral-timing results, we conclude that MAXI J1348−630 is a black hole candidate.

scholarly journals Probing Supercritical Accretion in Ultraluminous X-ray Source M82 X-1 by means of X-ray Spectral Evolution Analysis

2020 ◽  
Vol 240 ◽  
pp. 07005
Author(s):  
Izatul Hafizah ◽  
Kiki Vierdayanti
Keyword(s):  
Black Hole ◽  
Binary System ◽  
Accretion Rate ◽  
Spectral Evolution ◽  
X Ray ◽  
Mass Accretion Rate ◽  
Blackbody Model ◽  
Chi Squared ◽  
Dominant State ◽  
Black Hole Binary

We analyze the spectral evolution of ultraluminous X-ray source (ULX) M82 X-1 by means of spectral fitting. We use selected Swift/XRT data in 2014 and 2015. The flux of M82 X-1 increased by a factor of 2-3 from 2014 to 2015. Most of the data in 2015 show greater dominance of hard component than those of 2014. Due to moderate signal-to-noise ratio, we only fit each spectrum with power-law and disk blackbody model separately. The data in 2014 are better fitted with powerlaw model based on the value of reduced-chi squared. On the other hand, both powerlaw and diskbb models showed comparable re- duced chi-squared value for the data in 2015. We found that the range of spectral index for 2014 data is 1.65 < Γ < 2.08 and for 2015 data is 1.02 < Γ < 1.95 from the powerlaw model, resembling the range for that of black hole binary system at low mass accretion rate. We obtained higher innermost disk temper- ature from the disk blackbody model, 1.20 keV < Tin < 3.63 keV, compared to that of black hole binary system in the thermal state. The calculated innermost radius of the disk, Rin, varies between 0.99 to 4.89 RS assuming 10 M0 black hole which indicates that the spectral state is not in thermal dominant state but rather we suspect that M82 X-1 exhibits greater mass accretion rate than that of the thermal dominant state.

Parameters of V404 Cyg—A black-hole binary

2004 ◽  
Vol 48 (12) ◽  
pp. 1019-1028 ◽  
Author(s):  
A. M. Cherepashchuk ◽  
N. V. Borisov ◽  
M. K. Abubekerov ◽  
D. K. Klochkov ◽  
É. A. Antokhina
Keyword(s):  
Black Hole ◽  
Black Hole Binary

scholarly journals A reduced orbital period for the supermassive black hole binary candidate in the quasar PG 1302-102?

2015 ◽  
Vol 452 (3) ◽  
pp. 2540-2545 ◽  
Author(s):  
D. J. D'Orazio ◽  
Z. Haiman ◽  
P. Duffell ◽  
B. D. Farris ◽  
A. I. MacFadyen
Keyword(s):  
Black Hole ◽  
Orbital Period ◽  
Supermassive Black Hole ◽  
Black Hole Binary
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