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Reflection spectra of the black hole binary candidate MAXI J1535-571 in the hard state observed by NuSTAR

Reflection spectra of the black hole binary candidate MAXI J1535-571 in the hard state observed by NuSTAR
Reflection spectra of the black hole binary candidate MAXI J1535-571 in the hard state observed by NuSTAR

We report on a Nuclear Spectroscopic Telescope Array (NuSTAR) observation of the recently discovered bright black hole candidate MAXI J1535-571. NuSTAR observed the source on MJD 58003 (five days after the outburst was reported). The spectrum is characteristic of a black hole binary in the hard state. We observe clear disk reflection features, including a broad Fe Kα line and a Compton hump peaking around 30 keV. Detailed spectral modeling reveals a narrow Fe Kα line complex centered around 6.5 keV on top of the strong relativistically broadened Fe Kα line. The narrow component is consistent with distant reflection from moderately ionized material. The spectral continuum is well described by a combination of cool thermal disk photons and a Comptonized plasma with the electron temperature kTe = 19.7 ± 0.4 keV. An adequate fit can be achieved for the disk reflection features with a self-consistent relativistic reflection model that assumes a lamp-post geometry for the coronal illuminating source. The spectral fitting measures a black hole spin a > 0.84, inner disk radius Rin 2.01 rISCO, and a lamp-post height h = 7.2-2.0 +0.8rg(statistical errors, 90% confidence), indicating no significant disk truncation and a compact corona. Although the distance and mass of this source are not currently known, this suggests the source was likely in the brighter phases of the hard state during this NuSTAR observation.

accretion, accretion disks, black hole physics, X-rays: binaries
2041-8205
Xu, Yanjun
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Harrison, Fiona A.
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García, Javier A.
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Fabian, Andrew C.
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Fürst, Felix
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Gandhi, Poshak
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Grefenstette, Brian W.
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Madsen, Kristin K.
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Miller, Jon M.
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Parker, Michael L.
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Tomsick, John A.
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Walton, Dominic J.
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Xu, Yanjun
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Harrison, Fiona A.
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García, Javier A.
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Fabian, Andrew C.
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Fürst, Felix
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Gandhi, Poshak
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Grefenstette, Brian W.
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Madsen, Kristin K.
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Miller, Jon M.
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Parker, Michael L.
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Tomsick, John A.
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Walton, Dominic J.
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Xu, Yanjun, Harrison, Fiona A., García, Javier A., Fabian, Andrew C., Fürst, Felix, Gandhi, Poshak, Grefenstette, Brian W., Madsen, Kristin K., Miller, Jon M., Parker, Michael L., Tomsick, John A. and Walton, Dominic J. (2018) Reflection spectra of the black hole binary candidate MAXI J1535-571 in the hard state observed by NuSTAR. Astrophysical Journal Letters, 852 (2), [L34]. (doi:10.3847/2041-8213/aaa4b2).

Record type: Article

Abstract

We report on a Nuclear Spectroscopic Telescope Array (NuSTAR) observation of the recently discovered bright black hole candidate MAXI J1535-571. NuSTAR observed the source on MJD 58003 (five days after the outburst was reported). The spectrum is characteristic of a black hole binary in the hard state. We observe clear disk reflection features, including a broad Fe Kα line and a Compton hump peaking around 30 keV. Detailed spectral modeling reveals a narrow Fe Kα line complex centered around 6.5 keV on top of the strong relativistically broadened Fe Kα line. The narrow component is consistent with distant reflection from moderately ionized material. The spectral continuum is well described by a combination of cool thermal disk photons and a Comptonized plasma with the electron temperature kTe = 19.7 ± 0.4 keV. An adequate fit can be achieved for the disk reflection features with a self-consistent relativistic reflection model that assumes a lamp-post geometry for the coronal illuminating source. The spectral fitting measures a black hole spin a > 0.84, inner disk radius Rin 2.01 rISCO, and a lamp-post height h = 7.2-2.0 +0.8rg(statistical errors, 90% confidence), indicating no significant disk truncation and a compact corona. Although the distance and mass of this source are not currently known, this suggests the source was likely in the brighter phases of the hard state during this NuSTAR observation.

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Reflection Spectra of the Black Hole Binary Candidate MAXI J1535-571 in the Hard State Observed by NuSTAR - Accepted Manuscript
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Accepted/In Press date: 2 January 2018
e-pub ahead of print date: 12 January 2018
Published date: January 2018
Keywords: accretion, accretion disks, black hole physics, X-rays: binaries

Identifiers

Local EPrints ID: 417821
URI: http://eprints.soton.ac.uk/id/eprint/417821
ISSN: 2041-8205
PURE UUID: 6e8e887a-2c87-43f9-8bcb-d0519c87315c
ORCID for Poshak Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 14 Feb 2018 17:31
Last modified: 10 Oct 2020 04:01

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Contributors

Author: Yanjun Xu
Author: Fiona A. Harrison
Author: Javier A. García
Author: Andrew C. Fabian
Author: Felix Fürst
Author: Poshak Gandhi ORCID iD
Author: Brian W. Grefenstette
Author: Kristin K. Madsen
Author: Jon M. Miller
Author: Michael L. Parker
Author: John A. Tomsick
Author: Dominic J. Walton

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