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GRO J1008 57: a laboratory for accretion physics

Kühnel, Matthias and Müller, Sebastian and Fürst, Felix and Schwarm, Fritz-Walter and Kreykenbohm, Ingo and Wilms, Jörn and Pottschmidt, Katja and Suchy, Slawomir and Rothschild, Richard E. and Caballero, Isabel and Kretschmar, Peter and Schöherr, Gabriele and Klochkov, Dmitry and Staubert, Rüediger (2012) GRO J1008 57: a laboratory for accretion physics. In: An INTEGRAL view of the high-energy sky (the first 10 years) - 9th INTEGRAL Workshop and celebration of the 10th anniversary of the launch. Proceedings of Science. No.176. SISSA , Trieste, Italy, Art. No. 17. http://resolver.caltech.edu/CaltechAUTHORS:20180824-100034014

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Abstract

We present timing and spectroscopic results of three outbursts of the transient high mass X-ray binary GRO J1008−57 in 2005, 2007, and 2011. The orbital parameters from the literature are not in agreement with the measured pulse arrival times. We therefore updated the orbital solution, specifically the orbital period and the time of periastron passage, using pointed observations with RXTE, Swift, and Suzaku. We confirmed our results with an analysis of RXTE-ASM lightcurves. We show that GRO J1008−57’s outbursts occur mostly at the same orbital phase and therefore make predictions of outbursts and, thus, scheduled observations possible. The X-ray spectrum of GRO J1008−57 during an outburst can be well described by a cutoff power law with an additional black body at energies below 10 keV. We found that the same spectral model describes GRO J1008−57 during the rise and the decline of the outburst at fluxes changing by two orders of magnitude. In particular, the photon index of the power law and the black body flux show a correlation with the total X-ray flux. Other parameters such as the black body temperature and the folding energy are independent of flux and remain the same over all analyzed outbursts.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.22323/1.176.0017DOIBook Section
ORCID:
AuthorORCID
Wilms, Jörn0000-0003-2065-5410
Pottschmidt, Katja0000-0002-4656-6881
Additional Information:Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-ShareAlike. We thank the RXTE-, Swift- and Suzaku-teams for scheduling all observations used within this work. We acknowledge funding by the Bundesministerium für Wirtschaft und Technologie under Deutsches Zentrum für Luft- und Raumfahrt grants 50OR0808, 50OR0905, 50OR1113, and the Deutscher Akademischer Austauschdienst. All figures were produced using the SLXfig module, developed by John E. Davis.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
Bundesministerium für Wirtschaft und Technologie (BMWi)UNSPECIFIED
Deutsches Zentrum für Luft- und Raumfahrt (DLR)50OR0808
Deutsches Zentrum für Luft- und Raumfahrt (DLR)50OR0905
Deutsches Zentrum für Luft- und Raumfahrt (DLR)50OR1113
Deutscher Akademischer Austauschdienst (DAAD)UNSPECIFIED
Record Number:CaltechAUTHORS:20180824-100034014
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180824-100034014
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89141
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:24 Aug 2018 17:27
Last Modified:24 Aug 2018 17:32

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