Detection of anti-correlated hard X-ray time lag in Cygnus X-3

Simple item page
dc.creatorChoudhury, Manojendu
dc.creatorRao, A. R.
dc.date2004-10-12
dc.date.accessioned2026-07-07T02:15:05Z
dc.date.available2026-07-07T02:15:05Z
dc.descriptionThe wide-band X-ray spectra of the high mass X-ray binary Cygnus X-3 exhibits a pivoting behavior in the `low' (as well as `hard') state, correlated to the radio emission. The time scale of the soft and hard X-rays' anti-correlation, which gave rise to the pivoting feature, was found to be less than a day from the monitoring observations by RXTE--ASM and CGRO--BATSE. In this Letter we report the detection of a lag of $\lesssim$ 1000s in the anti-correlation of the hard X-ray emission (20--50 keV) to that of the soft X-ray emission (2--7 keV), which may be attributed to the viscous time scale of flow of matter in the accretion disk. This suggests the geometrical picture of a truncated accretion disc with a Compton cloud inside the disc, the relative sizes of which determine the spectral shape. Any change in the disc structure will take place in a viscous time scale, with corresponding anti-correlated change in the Compton cloud. We also report the pivoting in the spectra in one span of a pointed observation when an episode of the rearranging of the accretion system is serendipitously observed. This is the first such observation of hard X-ray delay seen in the persistent Galactic microquasars, within the precincts of the hard state.
dc.descriptionAccepted in The Astrophysical Journal (Letters): in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0410307
dc.identifierhttp://arxiv.org/abs/astro-ph/0410307
dc.identifierAstrophys.J. 616 (2004) L143-L146
dc.identifierdoi:10.1086/426543
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/8360
dc.subjectAstrophysics
dc.titleDetection of anti-correlated hard X-ray time lag in Cygnus X-3
dc.typetext

Files

Collections

arXiv