Spectral study of GX 339-4 with TCAF using Swift/XRT and NuSTAR Observation

Abstract

We fit spectra of galactic transient source GX~339-4 during its 2013 outburst using Two Component Advective Flow (TCAF) solution. For the first time, we are fitting combined NuSTAR and Swift observation with TCAF. We use TCAF to fit 0.8-9.0~keV Swift and 4-79 keV NuSTAR spectra along with the LAOR model. To fit the data we use disk accretion rate, halo accretion rate, size of the Compton cloud and the density jump of advective flows at this cloud boundary as model parameters. From TCAF fitted flow parameters, and energy spectral index we conclude that the source was in the hard state throughout this particular outburst. The present analysis also gives some idea about the broadening of Fe $K_{\alpha }$ with the accretion rate. Since TCAF does not include Fe line yet, we make use of the `LAOR model' as a phenomenological model and find an estimate of the Kerr parameter to be $\sim 0.99$ for this candidate.

10 pages, 4 figures, 1 table, Accepted for Publication in Astrophysics and Space Science

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• Spectral Analysis of $\chi$ Class Data of GRS 1915+105 Using TCAF Solution
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• Properties of 2017-18 'failed' Outburst of GX 339-4
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