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Oxford University Press, Monthly Notices of the Royal Astronomical Society, 3(342), p. 709-714, 2003

DOI: 10.1046/j.1365-8711.2003.06593.x

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The unusual supernova remnant surrounding the ultraluminous X-ray source IC 342 X-1

Journal article published in 2003 by Tp P. Roberts ORCID, Mr R. Goad, Mj J. Ward, Rs S. Warwick
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We report the results of an observation of a large diameter (110 pc) supernova remnant (SNR) found to encircle the position of the ultraluminous X-ray source (ULX) IC 342 X-1. The inferred initial energy input to the SNR is at least 2 -- 3 times greater than the canonical energy for an ``ordinary'' supernova remnant. Two regions on the inside of the shell are bright in [O III] lambda5007 emission, possibly as the result of X-ray photoionization by the ULX. If this is the case, then the morphology of this nebulosity implies that the X-ray emission from the ULX is anisotropic. The presence of the ULX, most probably a black hole X-ray binary, within an unusually energetic supernova remnant suggests that we may be observing the aftermath of a gamma-ray burst, though other origins for the energetic nebula are discussed. ; Comment: 6 pages, 3 figures (3rd in colour), accepted for publication in MNRAS