Spectral State Transitions of the Ultraluminous X-ray Source IC 342 X-1
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 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.
Keywords
Cite
@article{arxiv.1407.6254,
title = {Spectral State Transitions of the Ultraluminous X-ray Source IC 342 X-1},
author = {Hannah Marlowe and Philip Kaaret and Cornelia Lang and Hua Feng and Fabien Grise and Neal Miller and David Cseh and Stephane Corbel and Richard F. Mushotzky},
journal= {arXiv preprint arXiv:1407.6254},
year = {2015}
}
Comments
10 pages, 5 Figures. MNRAS: Accepted 2014 July 22