2017ApJ...851L..47G


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.16CEST20:54:26

2017ApJ...851L..47G - Astrophys. J., 851, L47-L47 (2017/December-3)

X-ray brightening and UV fading of tidal disruption event ASASSN-15oi.

GEZARI S., CENKO S.B. and ARCAVI I.

Abstract (from CDS):

We present late-time observations by Swift and XMM-Newton of the tidal disruption event (TDE) ASASSN-15oi that reveal that the source brightened in the X-rays by a factor of ∼10 one year after its discovery, while it faded in the UV/optical by a factor of ∼100. The XMM-Newton observations measure a soft X-ray blackbody component with kTbb∼45 eV, corresponding to radiation from several gravitational radii of a central ∼106 M black hole. The last Swift epoch taken almost 600 days after discovery shows that the X-ray source has faded back to its levels during the UV/optical peak. The timescale of the X-ray brightening suggests that the X-ray emission could be coming from delayed accretion through a newly forming debris disk and that the prompt UV/optical emission is from the prior circularization of the disk through stream-stream collisions. The lack of spectral evolution during the X-ray brightening disfavors ionization breakout of a TDE "veiled" by obscuring material. This is the first time a TDE has been shown to have a delayed peak in soft X-rays relative to the UV/optical peak, which may be the first clear signature of the real-time assembly of a nascent accretion disk, and provides strong evidence for the origin of the UV/optical emission from circularization, as opposed to reprocessed emission of accretion radiation.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): accretion, accretion disks - black hole physics - galaxies: nuclei - galaxies: nuclei

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME AT 2016fnl ev 00 29 57.04 +32 53 37.5           ~ 59 0
2 VIDEO J022516.97-043258.91 G 02 25 16.98 -04 32 58.9           ~ 25 0
3 ASASSN -14ae SN* 11 08 40.11 +34 05 52.4           ~ 76 0
4 LEDA 43234 G 12 48 15.2244073438 +17 46 26.496619532   16.5       ~ 164 0
5 [GBM2008] D3-13 G 14 19 29.80863 +52 52 06.3650   22.16   20.139 19.580 ~ 41 0
6 PS1-10jh ev 16 09 28.296 +53 40 23.52           ~ 110 0
7 iPTF 16axa ev 17 03 34.36 +30 35 36.8           ~ 31 0
8 ASASSN -15oi SN* 20 39 09.096 -30 45 20.71           ~ 69 0
9 2MASX J20390918-3045201 G 20 39 09.18 -30 45 20.1           ~ 5 0

    Equat.    Gal    SGal    Ecl

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2021.05.16-20:54:26

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