2017A&A...598A..29S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST07:35:36

2017A&A...598A..29S - Astronomy and Astrophysics, volume 598A, 29-29 (2017/2-1)

XMMSL1 J074008.2-853927: a tidal disruption event with thermal and non-thermal components.

SAXTON R.D., READ A.M., KOMOSSA S., LIRA P., ALEXANDER K.D. and WIERINGA M.H.

Abstract (from CDS):

Aims. We study X-ray bright tidal disruption events (TDE), close to the peak of their emission, with the intention of understanding the evolution of their light curves and spectra.
Methods. Candidate TDE are identified by searching for soft X-ray flares from non-active galaxies in recent XMM-Newton slew data.
Results. In April 2014, X-ray emission was detected from the galaxy XMMSL1 J074008.2-853927 (a.k.a. 2MASX 07400785-8539307), a factor 20 times higher than an upper limit from 20 years earlier. Both the X-ray and UV flux subsequently fell, by factors of 70 and 12 respectively. The bolometric luminosity peaked at Lbol∼2x1044ergs/s with a spectrum that may be modelled with thermal emission in the UV band, a power-law with Γ∼2 dominating in the X-ray band above 2 keV and a soft X-ray excess with an effective temperature of ∼86eV. Rapid variability locates the X-ray emission to within <73Rg of the nuclear black hole. Radio emission of flux density ∼1mJy, peaking at 1.5GHz was detected 21 months after discovery. Optical spectra indicate that the galaxy, at a distance of 73Mpc (z=0.0173), underwent a starburst 2Gyr ago and is now quiescent. We consider a tidal disruption event to be the most likely cause of the flare. If this proves to be correct then this is a very clean example of a disruption exhibiting both thermal and non-thermal radiation.

Abstract Copyright: © ESO, 2017

Journal keyword(s): X-rays: galaxies - galaxies: individual: XMMSL1 J074008.2-853927

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 CD-34 239 PM* 00 41 30.4742099792 -33 37 32.032402561 13.138 11.969 10.525 9.619 8.741 K9V 94 0
2 XMMSL1 J061927.1-655311 X 06 19 27.1 -65 53 11           ~ 3 0
3 XMMSL1 J074008.2-853927 X 07 40 08.2 -85 39 27           ~ 20 0
4 2MASX J07400785-8539307 GiG 07 40 08.2193101645 -85 39 31.344145121           ~ 11 0
5 2MASX J09520953+2143132 Sy1 09 52 09.5606451664 +21 43 13.316390538   18.56 18.10     ~ 37 0
6 CD-34 6792 PM* 10 32 13.6185042385 -35 37 41.710291605   12.84 11.84     F:wl: 125 0
7 SWIFT J1112.2-8238 X 11 11 47.797 -82 38 44.71           ~ 38 0
8 LAWD 37 WD* 11 45 42.9170659451 -64 50 29.464090822 11.08 11.725 11.513 11.34 11.163 DQ 231 0
9 NGC 4845 AGN 12 58 01.242 +01 34 32.09   17.40 16.31     ~ 208 0
10 IGR J12580+0134 gam 12 58 05.1 +01 34 26           ~ 21 0
11 NGC 5485 LIN 14 07 11.312 +55 00 05.47 14.34 13.82 12.22     ~ 222 0
12 GRB 110328A gB 16 44 49 +57 34.9           ~ 328 0
13 SWIFT J2058.4+0516 X 20 58 19.898 +05 13 32.25           ~ 101 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-07:35:36

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