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

Research output: Contribution to journalArticle

11 Citations (Scopus)

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 languageEnglish (US)
Pages (from-to)642-650
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume444
Issue number1
DOIs
StatePublished - Jul 26 2014

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radio
radio emission
x rays
accretion
accretion disks
hardness
curvature
luminosity
estimates
energy
temperature
noise level

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Marlowe, H. ; Kaaret, P. ; Lang, C. ; Feng, H. ; Grisé, F. ; Miller, N. ; Cseh, D. ; Corbel, S. ; Mushotzky, R. F. / Spectral state transitions of the Ultraluminous X-ray Source IC 342 X-1. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 444, No. 1. pp. 642-650.
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Marlowe, H, Kaaret, P, Lang, C, Feng, H, Grisé, F, Miller, N, Cseh, D, Corbel, S & Mushotzky, RF 2014, 'Spectral state transitions of the Ultraluminous X-ray Source IC 342 X-1', Monthly Notices of the Royal Astronomical Society, vol. 444, no. 1, pp. 642-650. https://doi.org/10.1093/mnras/stu1471

Spectral state transitions of the Ultraluminous X-ray Source IC 342 X-1. / Marlowe, H.; Kaaret, P.; Lang, C.; Feng, H.; Grisé, F.; Miller, N.; Cseh, D.; Corbel, S.; Mushotzky, R. F.

In: Monthly Notices of the Royal Astronomical Society, Vol. 444, No. 1, 26.07.2014, p. 642-650.

Research output: Contribution to journalArticle

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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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