High-density reflection spectroscopy: I. A case study of GX 339-4

Jiang J, Fabian AC, Wang J, Walton DJ, Garcia J, Parker ML, Steiner JF, Tomsick JA (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Monthly Notices of the Royal Astronomical Society Oxford University Press

Book Volume: 484

Pages Range: 1972-1982

Journal Issue: 2

DOI: 10.1093/mnras/stz095

Abstract

We present a broad-band spectral analysis of the black hole binary GX 339-4 with NuSTAR and Swift using high-density reflection model. The observations were taken when the source was in low-flux (LF) hard states during the outbursts in 2013 and 2015, and in a very high-flux (HF) soft state in 2015. The high-density reflection model can explain its LF spectra with no requirement for an additional low temperature thermal component. This model enables us to constrain the density in the disc surface of GX 339-4 in different flux states. The disc density in the LF state is log (ne/ cm−3) ≈ 21, 100 times higher than the density in the HF state (log (ne/ cm−3) = 18.93+−001216). A close-to-solar iron abundance is obtained by modelling the LF and HF broad-band spectra with variable density reflection model (ZFe = 1.50+−001204Z and ZFe = 1.05+−001715Z, respectively).

Authors with CRIS profile

Javier Garcia Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut

Involved external institutions

Massachusetts Institute of Technology (MIT) US United States (USA) (US) University of Cambridge GB United Kingdom (GB) European Space Agency (ESA) FR France (FR) University of California, Berkeley US United States (USA) (US)

How to cite

APA:

Jiang, J., Fabian, A.C., Wang, J., Walton, D.J., Garcia, J., Parker, M.L.,... Tomsick, J.A. (2019). High-density reflection spectroscopy: I. A case study of GX 339-4. Monthly Notices of the Royal Astronomical Society, 484(2), 1972-1982. https://dx.doi.org/10.1093/mnras/stz095

MLA:

Jiang, Jiachen, et al. "High-density reflection spectroscopy: I. A case study of GX 339-4." Monthly Notices of the Royal Astronomical Society 484.2 (2019): 1972-1982.

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