A Prominent Accretion Disk in the Low-Hard State of the Black Hole Candidate SWIFT J1753.5-0127

2006 ◽  
Vol 652 (2) ◽  
pp. L113-L116 ◽  
Author(s):  
J. M. Miller ◽  
J. Homan ◽  
G. Miniutti
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Black Hole Candidate ◽  
Hard State

scholarly journals Repeated short-term spectral softening in the low/hard state of the Galactic black hole candidate Swift J1753.5-0127

2015 ◽  
Vol 67 (1) ◽  
pp. 11-11 ◽  
Author(s):  
A. Yoshikawa ◽  
S. Yamada ◽  
S. Nakahira ◽  
M. Matsuoka ◽  
H. Negoro ◽  
...  
Keyword(s):  
Black Hole ◽  
Short Term ◽  
Black Hole Candidate ◽  
Galactic Black Hole ◽  
Hard State

scholarly journals Periodical Instabilities in the Blackhole Candidate GX339–4 Accretion Disk

1997 ◽  
Vol 163 ◽  
pp. 699-699
Author(s):  
Philippe Durouchoux
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Gamma Ray ◽  
Compact Object ◽  
Black Hole Candidate

AbstractGX339-4, a black hole candidate, has been monitored since more than 30 years by X and gamma-ray spectrometers on board a dozen of satellites. One of the main characteristics of this source is its bimodal behaviour (high and low states). These states, apparently driven by accretion of matter from a companion onto a compact object, appear to be periodic, with a 14.5 month repetitivity, and an approximative 4 month duration. We discuss, in this paper, on periodic instabilities in the accretion disk surrounding GX339–4 to explain this bimodal behaviour.

scholarly journals Accretion-outflow connection in the outliers of the “universal” radio/X-ray correlation

2010 ◽  
Vol 6 (S275) ◽  
pp. 255-259
Author(s):  
M. Coriat ◽  
S. Corbel ◽  
L. Prat ◽  
J. C. A. Miller-Jones ◽  
D. Cseh ◽  
...  
Keyword(s):  
Black Hole ◽  
Compact Objects ◽  
X Rays ◽  
X Ray ◽  
Black Hole Candidate ◽  
Long Term Study ◽  
Hard State ◽  
Universal Correlation ◽  
X Ray Binaries

AbstractIn recent years, numerous efforts have been devoted to unravel the connection between accretion flow and jets in accreting compact objects. Here we report new constraints on these issues, through the long term study of the radio and X-ray behaviour of the black hole candidate H 1743–322. This source is known to be one of the “outliers” of the universal radio/X-ray correlation, i.e. a group of stellar mass accreting black holes displaying fainter radio emission for a given X-ray luminosity, than expected from the correlation. In this work we find, at high X-ray luminosity in the hard state, a tight radio/X-ray correlation with an unusual steep slope of b = 1.38 ± 0.03. This correlation then breaks below ~5 × 10−3LEdd (M/10M⊙)−1 in X-rays and becomes shallower. When compared with radio/X-ray data from other black hole X-ray binaries, we see that the deviant points of H 1743–322 join the universal correlation and seem to follow it at low luminosity. Based on these results, we investigate several hypotheses that could explain both the b ~ 1.4 slope and the transition toward the universal correlation.

scholarly journals Colors and patterns of black hole X-ray binary GX 339-4

2020 ◽  
Vol 638 ◽  
pp. A127
Author(s):  
Ilia A. Kosenkov ◽  
Alexandra Veledina ◽  
Valery F. Suleimanov ◽  
Juri Poutanen
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Near Infrared ◽  
Interstellar Extinction ◽  
State Transitions ◽  
Infrared Range ◽  
X Ray ◽  
Soft State ◽  
Hard State ◽  
Infrared Wavelengths

Black hole X-ray binaries show signs of nonthermal emission in the optical to near-infrared range. We analyzed optical to near-infrared SMARTS data on GX 339-4 over the 2002–2011 period. Using soft state data, we estimated the interstellar extinction toward the source and characteristic color temperatures of the accretion disk. We show that various spectral states of regular outbursts occupy similar regions on color-magnitude diagrams, and that transitions between the states proceed along the same tracks despite substantial differences in the morphology of the observed light curves. We determine the typical duration of hard-to-soft and soft-to-hard state transitions and the hard state at the decaying stage of the outburst to be one, two, and four weeks, respectively. We find that the failed outbursts cannot be easily distinguished from the regular outbursts at their early stages, but if the source reaches 16 mag in V band, it transits to the soft state. By subtracting the contribution of the accretion disk, we obtain spectra of the nonthermal component, which have constant, nearly flat shapes during the transitions between the hard and soft states. In contrast to the slowly evolving nonthermal component seen at optical and near-infrared wavelengths, the mid-infrared spectrum is strongly variable on short timescales and sometimes shows a prominent excess with a cutoff below 1014 Hz. We show that the radio to optical spectrum can be modeled using three components corresponding to the jet, hot flow, and irradiated accretion disk.

scholarly journals Discovery of a broad iron line in the black hole candidate Swift J1753.5−0127, and the disc emission in the low/hard state revisited

2009 ◽  
Vol 394 (4) ◽  
pp. 2080-2088 ◽  
Author(s):  
Beike Hiemstra ◽  
Paolo Soleri ◽  
Mariano Méndez ◽  
Tomaso Belloni ◽  
Reham Mostafa ◽  
...  
Keyword(s):  
Black Hole ◽  
Iron Line ◽  
Black Hole Candidate ◽  
Hard State

scholarly journals A truncated accretion disk in the galactic black hole candidate source H1743–322

2009 ◽  
Vol 9 (8) ◽  
pp. 901-910 ◽  
Author(s):  
Kandulapati Sriram ◽  
Vivek Kumar Agrawal ◽  
Arikkala Raghurama Rao
Keyword(s):  
Black Hole ◽  
Accretion Disk ◽  
Black Hole Candidate ◽  
Galactic Black Hole

scholarly journals A NICER look at the state transitions of the black hole candidate MAXI J1535−571 during its reflares

2020 ◽  
Vol 496 (2) ◽  
pp. 1001-1012 ◽  
Author(s):  
V A Cúneo ◽  
K Alabarta ◽  
L Zhang ◽  
D Altamirano ◽  
M Méndez ◽  
...  
Keyword(s):  
Black Hole ◽  
Neutron Star ◽  
Timing Analysis ◽  
The State ◽  
State Transitions ◽  
X Ray ◽  
Black Hole Binaries ◽  
Black Hole Candidate ◽  
Hard State ◽  
Higher Sensitivity

ABSTRACT The black hole candidate and X-ray binary MAXI J1535−571 was discovered in 2017 September. During the decay of its discovery outburst, and before returning to quiescence, the source underwent at least four reflaring events, with peak luminosities of ∼1035–36 erg s−1 (d/4.1 kpc)2. To investigate the nature of these flares, we analysed a sample of NICER (Neutron star Interior Composition Explorer) observations taken with almost daily cadence. In this work, we present the detailed spectral and timing analysis of the evolution of the four reflares. The higher sensitivity of NICER at lower energies, in comparison with other X-ray detectors, allowed us to constrain the disc component of the spectrum at ∼0.5 keV. We found that during each reflare the source appears to trace out a q-shaped track in the hardness–intensity diagram similar to those observed in black hole binaries during full outbursts. MAXI J1535−571 transits between the hard state (valleys) and softer states (peaks) during these flares. Moreover, the Comptonized component is undetected at the peak of the first reflare, while the disc component is undetected during the valleys. Assuming the most likely distance of 4.1 kpc, we find that the hard-to-soft transitions take place at the lowest luminosities ever observed in a black hole transient, while the soft-to-hard transitions occur at some of the lowest luminosities ever reported for such systems.

scholarly journals NICER observations of the black hole candidate MAXI J0637–430 during the 2019-2020 Outburst

2021 ◽  
Author(s):  
Arghajit Jana ◽  
Gaurava K Jaisawal ◽  
Sachindra Naik ◽  
Neeraj Kumari ◽  
Birendra Chhotaray ◽  
...  
Keyword(s):  
Black Hole ◽  
State Transition ◽  
High Variability ◽  
Spectral Studies ◽  
Periodic Oscillations ◽  
Black Hole Candidate ◽  
Source Distance ◽  
Hard State ◽  
Rms Amplitude ◽  
Spectral States

Abstract We present detailed timing and spectral studies of the black hole candidate MAXI J0637–430 during its 2019-2020 outburst using observations with the Neutron Star Interior Composition Explorer (NICER) and the Neil Gehrels Swift Observatory. We find that the source evolves through the soft-intermediate, high-soft, hard-intermediate and low-hard states during the outburst. No evidence of quasi-periodic oscillations is found in the power density spectra of the source. Weak variability with fractional rms amplitude $<5{{\ \rm per\ cent}}$ is found in the softer spectral states. In the hard-intermediate and hard states, high variability with the fractional rms amplitude of $>20{{\ \rm per\ cent}}$ is observed. The 0.7 − 10 keV spectra with NICER are studied with a combined disk-blackbody and nthcomp model along with the interstellar absorption. The temperature of the disc is estimated to be 0.6 keV in the rising phase and decreased slowly to 0.1 keV in the declining phase. The disc component was not detectable or absent during the low hard state. From the state-transition luminosity and the inner edge of the accretion flow, we estimate the mass of the black hole to be in the range of 5–12 M⊙, assuming the source distance of d < 10 kpc.

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