EVOLUTION OF LARGE-SCALE MAGNETIC FIELDS AND STATE TRANSITIONS IN BLACK HOLE X-RAY BINARIES

2010 ◽  
Author(s):  
DING-XIONG WANG ◽  
CHANG-YIN HUANG ◽  
JIU-ZHOU WANG
Keyword(s):  
Black Hole ◽  
Magnetic Fields ◽  
Large Scale ◽  
State Transitions ◽  
X Ray ◽  
X Ray Binaries

scholarly journals A minimal timescale for the continuum in 4U 1608-52 and Aql X-1

2021 ◽  
Vol 502 (1) ◽  
pp. L72-L78
Author(s):  
K Mohamed ◽  
E Sonbas ◽  
K S Dhuga ◽  
E Göğüş ◽  
A Tuncer ◽  
...  
Keyword(s):  
Black Hole ◽  
Neutron Star ◽  
Power Spectra ◽  
Light Curves ◽  
State Transitions ◽  
Strong Positive Correlation ◽  
Present Evidence ◽  
X Ray ◽  
X Ray Binaries ◽  
The Continuum

ABSTRACT Similar to black hole X-ray binary transients, hysteresis-like state transitions are also seen in some neutron-star X-ray binaries. Using a method based on wavelets and light curves constructed from archival Rossi X-ray Timing Explorer observations, we extract a minimal timescale over the complete range of transitions for 4U 1608-52 during the 2002 and 2007 outbursts and the 1999 and 2000 outbursts for Aql X-1. We present evidence for a strong positive correlation between this minimal timescale and a similar timescale extracted from the corresponding power spectra of these sources.

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 Studying the presence of magnetic fields in a sample of high-mass X-ray binaries

2018 ◽  
Vol 14 (S346) ◽  
pp. 40-44
Author(s):  
Swetlana Hubrig ◽  
Alexander F. Kholtygin ◽  
Lara Sidoli ◽  
Markus Schöller ◽  
Silva P. Järvinen
Keyword(s):  
Magnetic Field ◽  
Black Hole ◽  
Magnetic Fields ◽  
Circular Polarization ◽  
Longitudinal Magnetic Field ◽  
Optical Component ◽  
High Mass ◽  
X Ray ◽  
X Ray Binaries ◽  
Low Dispersion

AbstractPrevious circular polarization observations obtained with the ESO FOcal Reducer low dispersion spectrograpgh at the VLT in 2007–2008 revealed the presence of a weak longitudinal magnetic field on the surface of the optical component of the X-ray binary Cyg X-1, which contains a black hole and an O9.7Iab supergiant on a 5.6 d orbit. In this contribution we report on recently acquired FORS 2 spectropolarimetric observations of Cyg X-1 along with measurements of a few additional high-mass X-ray binaries.

scholarly journals Modeling Magnetic Disk Wind State Transitions in Black Hole X-Ray Binaries

2021 ◽  
Vol 912 (2) ◽  
pp. 86
Author(s):  
Keigo Fukumura ◽  
Demosthenes Kazanas ◽  
Chris Shrader ◽  
Francesco Tombesi ◽  
Constantinos Kalapotharakos ◽  
...  
Keyword(s):  
Black Hole ◽  
State Transitions ◽  
Magnetic Disk ◽  
X Ray ◽  
Disk Wind ◽  
X Ray Binaries

scholarly journals Hot accretion flow with radiative cooling: state transitions in black hole X-ray binaries

2016 ◽  
Vol 459 (2) ◽  
pp. 1543-1553 ◽  
Author(s):  
Mao-Chun Wu ◽  
Fu-Guo Xie ◽  
Ye-Fei Yuan ◽  
Zhaoming Gan
Keyword(s):  
Black Hole ◽  
State Transitions ◽  
Radiative Cooling ◽  
X Ray ◽  
Accretion Flow ◽  
X Ray Binaries

scholarly journals X-Ray Determination of the Black-Hole Mass in Cygnus X-1

1998 ◽  
Vol 188 ◽  
pp. 388-389
Author(s):  
A. Kubota ◽  
K. Makishima ◽  
T. Dotani ◽  
H. Inoue ◽  
K. Mitsuda ◽  
...  
Keyword(s):  
Black Hole ◽  
Compact Object ◽  
Optical Observations ◽  
Black Hole Mass ◽  
X Ray ◽  
Upper Limit ◽  
Supergiant Star ◽  
X Ray Binaries ◽  
Two Bodies

About 10 X-ray binaries in our Galaxy and LMC/SMC are considered to contain black hole candidates (BHCs). Among these objects, Cyg X-1 was identified as the first BHC, and it has led BHCs for more than 25 years(Oda 1977, Liang and Nolan 1984). It is a binary system composed of normal blue supergiant star and the X-ray emitting compact object. The orbital kinematics derived from optical observations indicates that the compact object is heavier than ~ 4.8 M⊙ (Herrero 1995), which well exceeds the upper limit mass for a neutron star(Kalogora 1996), where we assume the system consists of only two bodies. This has been the basis for BHC of Cyg X-1.

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