Luminosity dependent accretion state change in GRO J1008–57

Date

2014-01-08

Department

Program

Citation of Original Publication

Kühnel, Matthias, Sebastian Müller, Ingo Kreykenbohm, Felix Fürst, Katja Pottschmidt, Richard E. Rothschild, Isabel Caballero, et al. “Luminosity Dependent Accretion State Change in GRO J1008–57.” EPJ Web of Conferences 64 (2014): 06003. https://doi.org/10.1051/epjconf/20136406003.

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Subjects

Abstract

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.