Статья

The Evolution of GX 339-4 in the Low-hard State as Seen by NuSTAR and Swift

Jingyi WangCenter for Field Theory and Particle Physics, Department of Physics, Fudan University, 200433 Shanghai, People's Republic of ChinaJavier A. GarcíaCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USA; [email protected]James F. SteinerMIT Kavli Institute for Astrophysics and Space Research, MIT, 70 Vassar Street, Cambridge, MA 02139, USAJohn A. TomsickSpace Sciences Laboratory, University of California, Berkeley, CA 94720, USAFiona A. HarrisonCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USA; [email protected]Cosimo BambiCenter for Field Theory and Particle Physics, Department of Physics, Fudan University, 200433 Shanghai, People's Republic of ChinaPierre-Olivier PetrucciUniversité Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, FranceJonathan FerreiraUniversité Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, FranceSusmita ChakravortyDepartment of Physics, Indian Institute of Science, Bangalore 560012, IndiaM. ClavelSpace Sciences Laboratory, University of California, Berkeley, CA 94720, USA

2018en

ABI

Аннотация

Abstract We analyze 11 Nuclear Spectroscopic Telescope Array and Swift observations of the black hole X-ray binary GX 339–4 in the hard state, 6 of which were taken during the end of the 2015 outburst and 5 during a failed outburst in 2013. These observations cover luminosities from 0.5% to 5% of the Eddington luminosity. Implementing the most recent version of the reflection model relxillCp , we perform simultaneous spectral fits on both data sets to track the evolution of the properties in the accretion disk, including the inner edge radius, the ionization, and the temperature of the thermal emission. We also constrain the photon index and electron temperature of the primary source (the “corona”). We observe a maximum truncation radius of 37 R g in the preferred fit for the 2013 data set, and a marginal correlation between the level of truncation and luminosity. We also explore a self-consistent model under the framework of coronal Comptonization, and find consistent results regarding the disk truncation in the 2015 data, providing a more physical preferred fit for the 2013 observations.

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Идентификаторы

DOI: 10.3847/1538-4357/aaa974

Цитирования и источники

Цитирований: 3Использованных источников: 0

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