Spectral study of GX 339-4 with TCAF using Swift and NuSTAR observation

Santanu Mondal; Sandip K. Chakrabarti; Dipak Debnath

doi:10.1007/s10509-016-2877-y

Spectral study of GX 339-4 with TCAF using Swift and NuSTAR observation

Santanu Mondal, Sandip K. Chakrabarti, Dipak Debnath

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

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_α 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.

Original language	English
Article number	309
Journal	Astrophysics and Space Science
Volume	361
Issue number	9
DOIs	https://doi.org/10.1007/s10509-016-2877-y
State	Published - 1 Sep 2016
Externally published	Yes

Keywords

Accretion disks
Black holes
Radiation hydrodynamics
Spectrum
Stars: individual (GX 339-4)
X-rays: binaries

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1007/s10509-016-2877-y

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title = "Spectral study of GX 339-4 with TCAF using Swift 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 Kα with the accretion rate. Since TCAF does not include Fe line yet, we make use of the {\textquoteleft}LAOR model{\textquoteright} as a phenomenological model and find an estimate of the Kerr parameter to be ∼ 0.99 for this candidate.",

keywords = "Accretion disks, Black holes, Radiation hydrodynamics, Spectrum, Stars: individual (GX 339-4), X-rays: binaries",

author = "Santanu Mondal and Chakrabarti, {Sandip K.} and Dipak Debnath",

note = "Publisher Copyright: {\textcopyright} 2016, Springer Science+Business Media Dordrecht.",

year = "2016",

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doi = "10.1007/s10509-016-2877-y",

language = "English",

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journal = "Astrophysics and Space Science",

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AU - Mondal, Santanu

AU - Chakrabarti, Sandip K.

AU - Debnath, Dipak

PY - 2016/9/1

Y1 - 2016/9/1

N2 - 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.

AB - 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.

KW - Accretion disks

KW - Black holes

KW - Radiation hydrodynamics

KW - Spectrum

KW - Stars: individual (GX 339-4)

KW - X-rays: binaries

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U2 - 10.1007/s10509-016-2877-y

DO - 10.1007/s10509-016-2877-y

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SN - 0004-640X

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JO - Astrophysics and Space Science

JF - Astrophysics and Space Science

IS - 9

M1 - 309

ER -

Spectral study of GX 339-4 with TCAF using Swift and NuSTAR observation

Abstract

Keywords

ASJC Scopus subject areas

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