A NuSTAR and Swift View of the Hard State of MAXI J1813-095

Jiachen Jiang; Douglas J. K. Buisson; Thomas Dauser; Andrew C. Fabian; Felix Fürst; Luigi C. Gallo; Fiona A. Harrison; Michael L. Parker; James F. Steiner; John A. Tomsick; Santiago Ubach; Dominic J. Walton

doi:10.1093/mnras/stac1401

A NuSTAR and Swift View of the Hard State of MAXI J1813-095

Jiachen Jiang, Douglas J. K. Buisson, Thomas Dauser, Andrew C. Fabian, Felix Fürst, Luigi C. Gallo, Fiona A. Harrison, Michael L. Parker, James F. Steiner, John A. Tomsick, Santiago Ubach, Dominic J. Walton

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Abstract

We present an analysis of the NuSTAR and Swift spectra of the black hole candidate MAXI J1813−095 in a failed-transition outburst in 2018. The NuSTAR observations show evidence of reflected emission from the inner region of the accretion disc. By modelling the reflection component in the spectra, we find a disc inner radius of Rin < 7 rg. This result suggests that either a slightly truncated disc or a non-truncated disc forms at a few per cent of the Eddington limit in MAXI J1813−095. Our best-fitting reflection models indicate that the geometry of the innermost accretion remains consistent during the period of NuSTAR observations. The spectral variability of MAXI J1813−095 from multi-epoch observations is dominated by the variable photon index of the Comptonization emission.

Original language	English
Pages (from-to)	1952–1960
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	514
Issue number	2
Early online date	20 May 2022
DOIs	https://doi.org/10.1093/mnras/stac1401
Publication status	Published - 1 Aug 2022

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astro-ph.HE

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© 2022, Oxford University Press. This is the final manuscript version of an article which has been published in final form at https://doi.org/10.1093/mnras/stac1401
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title = "A NuSTAR and Swift View of the Hard State of MAXI J1813-095",

abstract = "We present an analysis of the NuSTAR and Swift spectra of the black hole candidate MAXI J1813−095 in a failed-transition outburst in 2018. The NuSTAR observations show evidence of reflected emission from the inner region of the accretion disc. By modelling the reflection component in the spectra, we find a disc inner radius of Rin < 7 rg. This result suggests that either a slightly truncated disc or a non-truncated disc forms at a few per cent of the Eddington limit in MAXI J1813−095. Our best-fitting reflection models indicate that the geometry of the innermost accretion remains consistent during the period of NuSTAR observations. The spectral variability of MAXI J1813−095 from multi-epoch observations is dominated by the variable photon index of the Comptonization emission.",

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T1 - A NuSTAR and Swift View of the Hard State of MAXI J1813-095

AU - Jiang, Jiachen

AU - Buisson, Douglas J. K.

AU - Dauser, Thomas

AU - Fabian, Andrew C.

AU - Fürst, Felix

AU - Gallo, Luigi C.

AU - Harrison, Fiona A.

AU - Parker, Michael L.

AU - Steiner, James F.

AU - Tomsick, John A.

AU - Ubach, Santiago

AU - Walton, Dominic J.

PY - 2022/8/1

Y1 - 2022/8/1

N2 - We present an analysis of the NuSTAR and Swift spectra of the black hole candidate MAXI J1813−095 in a failed-transition outburst in 2018. The NuSTAR observations show evidence of reflected emission from the inner region of the accretion disc. By modelling the reflection component in the spectra, we find a disc inner radius of Rin < 7 rg. This result suggests that either a slightly truncated disc or a non-truncated disc forms at a few per cent of the Eddington limit in MAXI J1813−095. Our best-fitting reflection models indicate that the geometry of the innermost accretion remains consistent during the period of NuSTAR observations. The spectral variability of MAXI J1813−095 from multi-epoch observations is dominated by the variable photon index of the Comptonization emission.

AB - We present an analysis of the NuSTAR and Swift spectra of the black hole candidate MAXI J1813−095 in a failed-transition outburst in 2018. The NuSTAR observations show evidence of reflected emission from the inner region of the accretion disc. By modelling the reflection component in the spectra, we find a disc inner radius of Rin < 7 rg. This result suggests that either a slightly truncated disc or a non-truncated disc forms at a few per cent of the Eddington limit in MAXI J1813−095. Our best-fitting reflection models indicate that the geometry of the innermost accretion remains consistent during the period of NuSTAR observations. The spectral variability of MAXI J1813−095 from multi-epoch observations is dominated by the variable photon index of the Comptonization emission.

KW - astro-ph.HE

U2 - 10.1093/mnras/stac1401

DO - 10.1093/mnras/stac1401

M3 - Article

SN - 0035-8711

VL - 514

SP - 1952

EP - 1960

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

A NuSTAR and Swift View of the Hard State of MAXI J1813-095

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