scholarly journals Cross-correlation of X-rays for 4U 1608–52

2012 ◽  
Vol 8 (S290) ◽  
pp. 249-250
Author(s):  
Y. J. Lei ◽  
H. T. Zhang ◽  
A. L. Luo ◽  
Y. H. Zhao
Keyword(s):  
Black Hole ◽  
Cross Correlation ◽  
Accretion Rate ◽  
X Rays ◽  
Galactic Black Hole ◽  
The Cross ◽  
Black Hole Candidates

AbstractWe study the cross-correlation between X-rays of different energies for the atoll-type source 4U 1608–52 with RXTE, and find the cross-correlation evolutes along the different branches. The anti-correlation is reported from the Galactic black hole candidates and Z-type luminous sources in their hard states. Our results are a little different from the Z-type sources. Here we provide the first evidence that a similar anti-correlated feature can also be found in atoll-type source, and it is not corresponding to the lowest accretion rate.

scholarly journals Fast infrared variability from the black hole candidate MAXI J1535−571 and tight constraints on the modelling

2021 ◽  
Vol 503 (1) ◽  
pp. 614-624
Author(s):  
F M Vincentelli ◽  
P Casella ◽  
D M Russell ◽  
M C Baglio ◽  
A Veledina ◽  
...  
Keyword(s):  
Black Hole ◽  
Cross Correlation ◽  
Light Curves ◽  
X Rays ◽  
X Ray ◽  
Black Hole Candidate ◽  
Near Ir ◽  
The Cross ◽  
Short Time ◽  
Ir Light

ABSTRACT We present the results regarding the analysis of the fast X-ray/infrared (IR) variability of the black hole transient MAXI J1535−571. The data studied in this work consist of two strictly simultaneous observations performed with XMM–Newton (X-rays: 0.7–10 keV), VLT/HAWK-I (Ks band, 2.2 μm) and VLT/VISIR (M and PAH2_2 bands, 4.85 and 11.88 μm, respectively). The cross-correlation function between the X-ray and near-IR light curves shows a strong asymmetric anticorrelation dip at positive lags. We detect a near-IR QPO (2.5σ) at 2.07 ± 0.09 Hz simultaneously with an X-ray QPO at approximately the same frequency (f0 = 2.25 ± 0.05). From the cross-spectral analysis, a lag consistent with zero was measured between the two oscillations. We also measure a significant correlation between the average near-IR and mid-IR fluxes during the second night, but find no correlation on short time-scales. We discuss these results in terms of the two main scenarios for fast IR variability (hot inflow and jet powered by internal shocks). In both cases, our preliminary modelling suggests the presence of a misalignment between the disc and jet.

scholarly journals A study of the cross-correlation and time lag in black hole X-ray binary XTE J1859+226

2017 ◽  
Vol 362 (7) ◽  
Author(s):  
Songpeng Pei ◽  
Guoqiang Ding ◽  
Zhibing Li ◽  
Yajuan Lei ◽  
Rai Yuen ◽  
...  
Keyword(s):  
Black Hole ◽  
Cross Correlation ◽  
Time Lag ◽  
X Ray ◽  
The Cross

Gamma-ray monitoring of AGN and galactic black hole candidates by the gamma-ray observatory

1992 ◽  
Author(s):  
Wm. A. Wheaton ◽  
James C. Ling ◽  
R. T. Skelton ◽  
Alan Harmon ◽  
Gerald J. Fishman ◽  
...  
Keyword(s):  
Black Hole ◽  
Gamma Ray ◽  
Galactic Black Hole ◽  
Black Hole Candidates

scholarly journals Gamma‐Ray Spectral States of Galactic Black Hole Candidates

1998 ◽  
Vol 500 (2) ◽  
pp. 899-908 ◽  
Author(s):  
J. E. Grove ◽  
W. N. Johnson ◽  
R. A. Kroeger ◽  
K. McNaron‐Brown ◽  
J. G. Skibo ◽  
...  
Keyword(s):  
Black Hole ◽  
Gamma Ray ◽  
Galactic Black Hole ◽  
Spectral States ◽  
Black Hole Candidates

BATSE Observations of Galactic Black Hole Candidates

1995 ◽  
pp. 221-232 ◽  
Author(s):  
W. S. Paciesas ◽  
B. A. Harmon ◽  
B. C. Rubin ◽  
C. A. Wilson ◽  
S. N. Zhang
Keyword(s):  
Black Hole ◽  
Galactic Black Hole ◽  
Black Hole Candidates

scholarly journals X-ray dips and a complex UV/X-ray cross-correlation function in the black hole candidate MAXI J1820+070

2019 ◽  
Vol 488 (1) ◽  
pp. L18-L23 ◽  
Author(s):  
J J E Kajava ◽  
S E Motta ◽  
A Sanna ◽  
A Veledina ◽  
M Del Santo ◽  
...  
Keyword(s):  
Black Hole ◽  
Correlation Function ◽  
Cross Correlation ◽  
Timing Analysis ◽  
Cross Correlation Function ◽  
X Rays ◽  
X Ray ◽  
Black Hole Candidate ◽  
Uv Emission ◽  
Partial Covering

ABSTRACT MAXI J1820+070, a black hole candidate first detected in early 2018 March, was observed by XMM–Newton during the outburst rise. In this letter we report on the spectral and timing analysis of the XMM–Newton X-ray and UV data, as well as contemporaneous X-ray data from the Swift satellite. The X-ray spectrum is well described by a hard thermal Comptonization continuum. The XMM–Newton X-ray light curve shows a pronounced dipping interval, and spectral analysis indicates that it is caused by a moderately ionized partial covering absorber. The XMM–Newton/OM U-filter data do not reveal any signs of the 17 h orbital modulation that was seen later on during the outburst decay. The UV/X-ray cross-correlation function shows a complex shape, with a peak at positive lags of about 4 s and a precognition dip at negative lags, which is absent during the X-ray dipping episode. Such shape could arise if the UV emission comes partially from synchrotron self-Compton emission near the black hole, as well as from reprocessing of the X-rays in the colder accretion disc further out.

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