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Astrophysics > High Energy Astrophysical Phenomena

arXiv:1301.7060 (astro-ph)
[Submitted on 29 Jan 2013]

Title:INTEGRAL observations of Sco X-1: evidence for Comptonization up to 200 keV

Authors:T. Maiolino, F. D'Amico, J. Braga
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Abstract:We have analyzed a long-term database for Sco X-1 obtained with the telescope IBIS onboard the INTEGRAL satellite in order to study the hard X-ray behavior of Sco X-1 from 20 up to 200 keV. Besides the data used for producing of the INTEGRAL catalog of sources, this is the longest (412 ks) database of IBIS on Sco X-1 up to date. The production of hard X-ray tails in low-mass X-ray binaries is still a matter of debate. Since most of the fits to the high-energy part of the spectra are done with powerlaw models, the physical mechanism for the hard X-ray tail production is unclear. The purpose of this study is to better constrain those possible mechanisms. Our main result shows a strong correlation between the fluxes in the thermal and nonthermal part of Sco X-1 spectra. We thus suggest that Comptonization of lower energy photons is the mechanism for producing hard X-ray tails in Sco X-1.
Comments: 4 pages, 3 figures, 2 tables; officially accepted for publication (as a Letter) by A&A in 2013 January 22
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:1301.7060 [astro-ph.HE]
  (or arXiv:1301.7060v1 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.1301.7060
Related DOI: https://doi.org/10.1051/0004-6361/201220677

Submission history

From: Taís Maiolino MSc [view email]
[v1] Tue, 29 Jan 2013 20:57:19 UTC (316 KB)
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