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A Multiwavelength Study of the Relativistic Tidal Disruption Candidate Sw J2058+05 at Late Times | | Dheeraj R. Pasham
; S. Bradley Cenko
; Andrew J. Levan
; Geoffrey C. Bower
; Assaf Horesh
; Gregory C. Brown
; Stephen Dolan
; Klaas Wiersema
; Alexei V. Filippenko
; Andrew S. Fruchter
; Jochen Greiner
; Rebekah A. Hounsell
; Paul T. O'Brien
; Kim L. Page
; Arne Rau
; Nial R. Tanvir
; | | Date: |
4 Feb 2015 | | Abstract: | ${it Swift}$ J2058.4+0516 (Sw J2058+05, hereafter) has been suggested as the
second member (after Sw J1644+57) of the rare class of tidal disruption events
accompanied by relativistic ejecta. Here we report a multiwavelength (X-ray,
ultraviolet/optical/infrared, radio) analysis of Sw J2058+05 from 3 months to 3
yr post-discovery in order to study its properties and compare its behavior
with that of Sw J1644+57. Our main results are as follows. (1) The long-term
X-ray light curve of Sw J2058+05 shows a remarkably similar trend to that of Sw
J1644+57. After a prolonged power-law decay, the X-ray flux drops off rapidly
by a factor of $gtrsim 160$ within a span of $Delta$$t$/$t$ $le$ 0.95.
Associating this sudden decline with the transition from super-Eddington to
sub-Eddington accretion, we estimate the black hole mass to be in the range of
$10^{4-6}$ M$_{odot}$. (2) We detect rapid ($lesssim 500$ s) X-ray
variability before the dropoff, suggesting that, even at late times, the X-rays
originate from close to the black hole (ruling out a forward-shock origin). (3)
We confirm using ${it HST}$ and VLBA astrometry that the location of the
source coincides with the galaxy’s center to within $lesssim 400$ pc (in
projection). (4) We modeled Sw J2058+05’s ultraviolet/optical/infrared spectral
energy distribution with a single-temperature blackbody and find that while the
radius remains more or less constant at a value of $63.4 pm 4.5$ AU ($sim
10^{15}$ cm) at all times during the outburst, the blackbody temperature drops
significantly from $sim$ 30,000 K at early times to a value of $sim$ 15,000 K
at late times (before the X-ray dropoff). Our results strengthen Sw J2058+05’s
interpretation as a tidal disruption event similar to Sw J1644+57. For such
systems, we suggest the rapid X-ray dropoff as a diagnostic for black hole
mass. | | Source: | arXiv, 1502.1345 | | Services: | Forum | Review | PDF | Favorites | |
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