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19 April 2024 |
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Swift J2058.4+0516: Discovery of a Possible Second Relativistic Tidal Disruption Flare | | S. Bradley Cenko
; Hans A. Krimm
; Assaf Horesh
; Arne Rau
; Dale A. Frail
; Jaime A. Kennea
; Andrew J. Levan
; Stephen T. Holland
; Nat R. Butler
; Robert M. Quimby
; Joshua S. Bloom
; Alexei V. Filippenko
; Avishay Gal-Yam
; Jochen Greiner
; S. R. Kulkarni
; Eran O. Ofek
; Felipe Olivares E.
; Patricia Schady
; Jeffrey M. Silverman
; Nial Tanvir
; Dong Xu
; | | Date: |
26 Jul 2011 | | 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. | | Source: | arXiv, 1107.5307 | | Services: | Forum | Review | PDF | Favorites | |
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