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Astrophysics > High Energy Astrophysical Phenomena

arXiv:1305.2936 (astro-ph)
[Submitted on 13 May 2013]

Title:GRO J1008-57: an (almost) predictable transient X-ray binary

Authors:M. Kühnel, S. Müller, I. Kreykenbohm, F. Fürst, K. Pottschmidt, R. E. Rothschild, I. Caballero, V. Grinberg, G. Schönherr, C. Shrader, D. Klochkov, R. Staubert, C. Ferrigno, J.-M. Torrejón, S. Martínez-Núñez, J. Wilms
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Abstract:A study of archival RXTE, Swift, and Suzaku pointed observations of the transient high mass X-ray binary GRO J1008-57 is presented. A new orbital ephemeris based on pulse arrival timing shows times of maximum luminosities during outbursts of GRO J1008-57 to be close to periastron at orbital phase -0.03. This makes the source one of a few for which outburst dates can be predicted with very high precision.
Spectra of the source in 2005, 2007, and 2011 can be well described by a simple power law with high energy cutoff and an additional black body at lower energies. The photon index of the power law and the black body flux only depend on the 15-50 keV source flux. No apparent hysteresis effects are seen. These correlations allow to predict the evolution of the pulsar's X-ray spectral shape over all outbursts as a function of just one parameter, the source's flux. If modified by an additional soft component, this prediction even holds during GRO J1008-57's 2012 type II outburst.
Comments: A&A accepted on 13 May 2013, 15 pages, 16 figures
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:1305.2936 [astro-ph.HE]
  (or arXiv:1305.2936v1 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.1305.2936
Related DOI: https://doi.org/10.1051/0004-6361/201321203

Submission history

From: Matthias Kühnel [view email]
[v1] Mon, 13 May 2013 20:03:30 UTC (652 KB)
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