Spectral state transitions of the Ultraluminous X-ray Source IC 342 X-1

H. Marlowe; P. Kaaret; C. Lang; H. Feng; F. Grisé; N. Miller; D. Cseh; S. Corbel; R. F. Mushotzky

doi:10.1093/mnras/stu1471

Spectral state transitions of the Ultraluminous X-ray Source IC 342 X-1

H. Marlowe, P. Kaaret, C. Lang, H. Feng, F. Grisé, N. Miller, D. Cseh, S. Corbel, R. F. Mushotzky

Astronomy & Astrophysics

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Abstract

We observed the Ultraluminous X-ray Source (ULX) IC 342 X-1 simultaneously in X-ray and radio with Chandra and the JVLA to investigate previously reported unresolved radio emission coincident with the ULX. The Chandra data reveal a spectrum that is much softer than observed previously and is well modelled by a thermal accretion disc spectrum. No significant radio emission above the rms noise level was observed within the region of the ULX, consistent with the interpretation as a thermal state though other states cannot be entirely ruled out with the current data.We estimate the mass of the black hole using the modelled inner disc temperature to be 30M· ≲ Mcosi ≲ 200M· based on a Shakura-Sunyaev disc model. Through a study of the hardness and high-energy curvature of available X-ray observations, we find that the accretion state of X-1 is not determined by luminosity alone.

Original language	English (US)
Pages (from-to)	642-650
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	444
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stu1471
State	Published - Jul 26 2014

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Astronomy and Astrophysics
Space and Planetary Science

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title = "Spectral state transitions of the Ultraluminous X-ray Source IC 342 X-1",

abstract = "We observed the Ultraluminous X-ray Source (ULX) IC 342 X-1 simultaneously in X-ray and radio with Chandra and the JVLA to investigate previously reported unresolved radio emission coincident with the ULX. The Chandra data reveal a spectrum that is much softer than observed previously and is well modelled by a thermal accretion disc spectrum. No significant radio emission above the rms noise level was observed within the region of the ULX, consistent with the interpretation as a thermal state though other states cannot be entirely ruled out with the current data.We estimate the mass of the black hole using the modelled inner disc temperature to be 30M· ≲ Mcosi ≲ 200M· based on a Shakura-Sunyaev disc model. Through a study of the hardness and high-energy curvature of available X-ray observations, we find that the accretion state of X-1 is not determined by luminosity alone.",

author = "H. Marlowe and P. Kaaret and C. Lang and H. Feng and F. Gris{\'e} and N. Miller and D. Cseh and S. Corbel and Mushotzky, {R. F.}",

note = "Publisher Copyright: {\textcopyright} 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.",

year = "2014",

month = jul,

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doi = "10.1093/mnras/stu1471",

language = "English (US)",

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T1 - Spectral state transitions of the Ultraluminous X-ray Source IC 342 X-1

AU - Marlowe, H.

AU - Kaaret, P.

AU - Lang, C.

AU - Feng, H.

AU - Grisé, F.

AU - Miller, N.

AU - Cseh, D.

AU - Corbel, S.

AU - Mushotzky, R. F.

PY - 2014/7/26

Y1 - 2014/7/26

N2 - We observed the Ultraluminous X-ray Source (ULX) IC 342 X-1 simultaneously in X-ray and radio with Chandra and the JVLA to investigate previously reported unresolved radio emission coincident with the ULX. The Chandra data reveal a spectrum that is much softer than observed previously and is well modelled by a thermal accretion disc spectrum. No significant radio emission above the rms noise level was observed within the region of the ULX, consistent with the interpretation as a thermal state though other states cannot be entirely ruled out with the current data.We estimate the mass of the black hole using the modelled inner disc temperature to be 30M· ≲ Mcosi ≲ 200M· based on a Shakura-Sunyaev disc model. Through a study of the hardness and high-energy curvature of available X-ray observations, we find that the accretion state of X-1 is not determined by luminosity alone.

AB - We observed the Ultraluminous X-ray Source (ULX) IC 342 X-1 simultaneously in X-ray and radio with Chandra and the JVLA to investigate previously reported unresolved radio emission coincident with the ULX. The Chandra data reveal a spectrum that is much softer than observed previously and is well modelled by a thermal accretion disc spectrum. No significant radio emission above the rms noise level was observed within the region of the ULX, consistent with the interpretation as a thermal state though other states cannot be entirely ruled out with the current data.We estimate the mass of the black hole using the modelled inner disc temperature to be 30M· ≲ Mcosi ≲ 200M· based on a Shakura-Sunyaev disc model. Through a study of the hardness and high-energy curvature of available X-ray observations, we find that the accretion state of X-1 is not determined by luminosity alone.

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U2 - 10.1093/mnras/stu1471

DO - 10.1093/mnras/stu1471

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

Spectral state transitions of the Ultraluminous X-ray Source IC 342 X-1

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