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Spectral state transitions of the Ultraluminous X-ray Source IC 342 X-1.
- Source :
-
Monthly Notices of the Royal Astronomical Society . Oct2014, Vol. 444 Issue 1, p642-650. 9p. - Publication Year :
- 2014
-
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 $30 \,\mathrm{M_{{\odot }}} \lesssim M\sqrt{\mathrm{cos}i}\lesssim 200 \,\mathrm{M_{{\odot }}}$ 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. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 444
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 97894602
- Full Text :
- https://doi.org/10.1093/mnras/stu1471