2016/04/30 by Santanu Mondal, Sandip K. Chakrabarti, Dipak Debnath · 2 citations
Physics and Astronomy · #Accretion (finance) #Accretion disc #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Cosmology #Flare #Galaxies: Formation, Evolution, Phenomena #Halo #Spectral index #Spectral line #Swift #astro-ph.HE
paper · pdf · doi:10.1007/s10509-016-2877-y
10 pages, 4 figures, 1 table, Accepted for Publication in Astrophysics and Space Science
openalex created_date 2016/06/24 · arxiv created 2016/07/26 · openalex publication_date 2016/08/18 · arxiv updated 2016/08/30 · openalex updated_date 2026/08/05
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 Kα 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 ∼ 0.99 for this candidate.