Li 2008 XRF 080109/SN 2008D的X成份可能是X射线闪

主要内容:
驳斥了此暴是shock breakout的说法，认为是低光度的X射线闪。

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文章信息:

· arXiv e-print (arXiv:0803.0079)

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Title:		The X-Ray Transient 080109 in NGC 2770: an X-Ray Flash Associated with a Normal Core-Collapse Supernova
Authors:		Li, Li-Xin
Publication:		eprint arXiv:0803.0079
Publication Date:		03/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		9 pages, 6 figures. Submitted to MNRAS
Bibliographic Code:		2008arXiv0803.0079L

Abstract

Although it is generally thought that long-duration gamma-ray bursts (GRBs) are associated with core-collapse supernovae, so far only four pairs of GRBs and supernovae with firmly established connection have been found. This is caused by the fact that supernovae are much fainter than the afterglow of bright GRBs so it is difficult to identify them in GRBs at cosmological distances, and the number of nearby faint GRBs is few. All the four GRB-supernovae are among a special class of Type Ic--called the broad-lined SNe characterized by smooth and featureless spectra and very large explosion energy, suggesting that only a small fraction of Type Ibc supernovae have GRBs associated with them. This scheme has been refreshed by the discovery of a bright X-ray transient in NGC 2770 on 9 January 2008, which was followed by a normal Type Ib supernova, SN 2008D. In this paper, I argue that the transient 080109 is an X-ray flash (XRF, a soft version of a GRB) by presenting the following evidences: (1) XRF 080109 satisfies the well-known relation of the total isotropic-equivalent energy versus the peak spectral energy for long-duration GRBs; (2) XRF 080109/SN 2008D agree with the relation between the peak spectral energy of GRBs and the maximum bolometric luminosity or the mass of nickels of the underlying supernovae as proposed by Li in 2006. The discovery of XRF 080109/SN 2008D broadens the connection between GRBs/XRFs and supernovae. I speculate that events like XRF 080109 may occur at a rate comparable to Type Ibc supernovae, and a soft X-ray telescope devoted to surveying for nearby X-ray flares will be very fruitful in finding under-luminous XRFs associated with normal core-collapse supernovae.

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