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Swift J2058.4+0516 : discovery of a possible second relativistic tidal disruption flare?
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(2012) Swift J2058.4+0516 : discovery of a possible second relativistic tidal disruption flare? The Astrophysical Journal, Vol.753 (No.1). p. 77. doi:10.1088/0004-637X/753/1/77 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/0004-637X/753/1/77
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 × 1047 erg s–1) and radio (νL ν, iso 1042 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 (compared with the expected rate of tidal disruptions) implies that either these outflows are extremely narrowly collimated (θ < 1°) 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 rapid 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 (AGN)), Sw J2058+05 would seem to represent a new mode of variability in these sources, as the observed properties appear largely inconsistent with known classes of AGNs capable of generating relativistic jets (blazars, narrow-line Seyfert 1 galaxies).
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | The Astrophysical Journal | ||||
Publisher: | Institute of Physics Publishing Ltd. | ||||
ISSN: | 0004-637X | ||||
Official Date: | 2012 | ||||
Dates: |
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Volume: | Vol.753 | ||||
Number: | No.1 | ||||
Page Range: | p. 77 | ||||
DOI: | 10.1088/0004-637X/753/1/77 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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