EPJ Web of Conferences
Volume 64, 2014Physics at the Magnetospheric Boundary
|Number of page(s)||6|
|Section||Observations of Compact Objects (Part 1)|
|Published online||08 January 2014|
Luminosity dependent accretion state change in GRO J1008–57
1 Dr. Karl Remeis-Observatory & ECAP, Universität Erlangen-Nürnberg, Sternwartstr. 7, 96049 Bamberg, Germany
2 Space Radiation Lab, California Institute of Technology, MC 290-17 Cahill, 1200 E. California Blvd., Pasadena, CA 91125, USA
3 CRESST, Center for Space Science and Technology, UMBC, Baltimore, MD 21250, USA
4 NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
5 Center for Astronomy and Space Sciences, University of California, San Diego, La Jolla, CA 92093, USA
6 CEA Saclay, DSM/IRFU/SAp-UMR AIM (7158) CNRS/CEA/Université Paris 7, Diderot, 91191 Gif sur Yvette, France
7 Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
8 Universities Space Research Association, Columbia, MD 21044, USA
9 Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
10 ISDC Data Center for Astrophysics, Chemin d’Écogia 16, 1290 Versoix, Switzerland
11 Instituto de Física Aplicada a las Ciencias y las Tecnologías, Universidad de Alicante, 03080 Alicante, Spain
Published online: 8 January 2014
In a former publication, we have analyzed the transient neutron star X-ray binary GRO J1008–57 using all available RXTE-, Swift-, and Suzaku-data. As we have found, the source’s spectral components, i.e., a power-law with high exponential cutoff and a black-body, are strongly correlated with the hard X-ray flux (15–50 keV). We update the analytical description of these dependence, including a change in the photon index behaviour from a flat to a logarithmic function. The flux, where the change occurs, is consistent with the onset of the black-body emission. Thus, a change of the accretion state always occurs in GRO J1008–57 at a particular flux level.
© Owned by the authors, published by EDP Sciences, 2014
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