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Tracing the reverberation lag in the hard state of black hole X-ray binaries | | B. De Marco
; G. Ponti
; T. Muñoz-Darias
; K. Nandra
; | | Date: |
9 Oct 2015 | | Abstract: | We report results obtained from a systematic analysis of X-ray lags in a
sample of black hole X-ray binaries, with the aim of assessing the presence of
reverberation lags and studying their evolution during outburst. We used
XMM-Newton and simultaneous RXTE observations to obtain broad-band energy
coverage of both the disc and the hard X-ray Comptonization components. In most
cases the detection of reverberation lags is hampered by low levels of
variability signal-to-noise ratio (e.g. typically when the source is in a soft
state) and/or short exposure times. The most detailed study was possible for GX
339-4 in the hard state, which allowed us to characterize the evolution of
X-ray lags as a function of luminosity in a single source. Over all the sampled
frequencies (~0.05-9 Hz) we observe the hard lags intrinsic to the power law
component, already well-known from previous RXTE studies. The XMM-Newton soft
X-ray response allows us to detail the disc variability. At low-frequencies
(long time scales) the disc component always leads the power law component. On
the other hand, a soft reverberation lag (ascribable to thermal reprocessing)
is always detected at high-frequencies (short time scales). The intrinsic
amplitude of the reverberation lag decreases as the source luminosity and the
disc-fraction increase. This suggests that the distance between the X-ray
source and the region of the optically-thick disc where reprocessing occurs,
gradually decreases as GX 339-4 rises in luminosity through the hard state,
possibly as a consequence of reduced disc truncation. | | Source: | arXiv, 1510.2798 | | Services: | Forum | Review | PDF | Favorites | |
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