主要内容:
可能是第二个被大质量黑洞吃掉的恒星。
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文章信息:
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- · arXiv e-print (arXiv:1107.5307)
- · References in the Article
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| Title: |
| Swift J2058.4+0516: Discovery of a Possible Second Relativistic Tidal Disruption Flare |
| Authors: |
| Cenko, S. Bradley; Krimm, Hans A.; Horesh, Assaf; Rau, Arne; Frail, Dale A.; Kennea, Jaime A.; Levan, Andrew J.;Holland, Stephen T.; Butler, Nat R.; Quimby, Robert M.; Bloom, Joshua S.; Filippenko, Alexei V.; Gal-Yam, Avishay;Greiner, Jochen; Kulkarni, S. R.; Ofek, Eran O.; Olivares E., Felipe; Schady, Patricia; Silverman, Jeffrey M.;Tanvir, Nial; Xu, Dong |
| Publication: |
| eprint arXiv:1107.5307 |
| Publication Date: |
| 07/2011 |
| Origin: |
| ARXIV |
| Keywords: |
| Astrophysics - High Energy Astrophysical Phenomena |
| Comment: |
| 9 pages, 5 figures, submitted to ApJ, comments welcome |
| Bibliographic Code: |
| 2011arXiv1107.5307C |
Abstract
We report the discovery by the Swift hard X-ray monitor of the transient source Swift J2058.4+0516 (Sw J2058+05). Our multi-wavelength follow-up campaign uncovered a long-lived (duration >~ months), luminous X-ray (L_X,iso ~ 3 x 10e47 erg s^-1) and radio (v L_v,iso ~ 10e42 erg s^-1) counterpart. The associated optical emission, however, from which we measure a redshift of 1.1853, is relatively faint, and this is not due to a large amount of dust extinction in the host galaxy. Based on numerous similarities with the recently discovered GRB 110328A / Swift J164449.3+573451 (Sw J1644+57), we suggest that Sw J2058+05 may be the second member of a new class of relativistic outbursts resulting from the tidal disruption of a star by a supermassive black hole. If so, the relative rarity of these sources implies that either these outflows are extremely narrowly collimated (theta < 1 deg), or only a small fraction of tidal disruptions generate relativistic ejecta. Analogous to the case of long-duration gamma-ray bursts and core-collapse supernovae, we speculate that the spin of the black hole may be a necessary condition to generate the relativistic component. Alternatively, if powered by gas accretion (i.e., an active galactic nucleus), this would imply that some galaxies can transition from apparent quiescence to a radiatively efficient state of accretion on quite short time scales.
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