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Astrophysics > High Energy Astrophysical Phenomena

arXiv:1304.5371 (astro-ph)
[Submitted on 19 Apr 2013]

Title:X-ray bursts as a probe of the corona: the case of XRB 4U 1636-536

Authors:Long Ji, Shu Zhang, YuPeng Chen, Shuang-Nan Zhang, Diego F. Torres, Peter Kretschmar, Masha Chernyakova, Jian Li, Jian-Min Wang
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Abstract:To investigate the possible cooling of the corona by soft X-rays bursts, we have studied 114 bursts embedded in the known X-ray evolution of 4U 1636-536. We have grouped these bursts according to the ratio of the flux in the 1.5--12 keV band with respect to that in the 15--50 keV band, as monitored by RXTE/ASM and Swift/BAT, respectively. We have detected a shortage at hard X-rays while bursting. This provides hints for a corona cooling process driven by soft X-rays fed by the bursts that occurred on the surface of neutron star. The flux shortage at 30--50 keV has a time lag of 2.4$\pm$1.5 seconds with respect to that at 2--10 keV, which is comparable to that of 0.7$\pm$0.5 seconds reported in bursts of IGR 17473-2721. We comment on the possible origin of these phenomena and on the implications for the models on the location of the corona.
Comments: 6 pages, 9 figures, accepted by MNRAS
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:1304.5371 [astro-ph.HE]
  (or arXiv:1304.5371v1 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.1304.5371
Related DOI: https://doi.org/10.1093/mnras/stt625

Submission history

From: Long Ji [view email]
[v1] Fri, 19 Apr 2013 10:54:17 UTC (725 KB)
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