Journal article
Spectral State Transitions of the Ultraluminous X-ray Source IC 342 X-1
Monthly notices of the Royal Astronomical Society, Vol.444(1), pp.642-650
07/23/2014
DOI: 10.1093/mnras/stu1471
Abstract
We observed the Ultraluminous X-ray Source 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 $30~\mathrm{M_{\odot}} \lesssim
M\sqrt{\mathrm{cos}i}\lesssim200~\mathrm{M_{\odot}}$ 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.
Details
- Title: Subtitle
- Spectral State Transitions of the Ultraluminous X-ray Source IC 342 X-1
- Creators
- Hannah Marlowe - University of IowaPhilip Kaaret - University of IowaCornelia Lang - University of IowaHua Feng - Tsinghua UniversityFabien Grise - Université de StrasbourgNeal Miller - Stevenson UniversityDavid Cseh - Radboud University NijmegenStephane Corbel - Université Paris CitéRichard F Mushotzky - University of Maryland, College Park
- Resource Type
- Journal article
- Publication Details
- Monthly notices of the Royal Astronomical Society, Vol.444(1), pp.642-650
- DOI
- 10.1093/mnras/stu1471
- ISSN
- 0035-8711
- eISSN
- 1365-2966
- Publisher
- Oxford University Press
- Language
- English
- Date published
- 07/23/2014
- Academic Unit
- Liberal Arts and Science Admin; Physics and Astronomy
- Record Identifier
- 9984199846102771
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