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23 April 2024 |
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OGLE16aaa - a Signature of a Hungry Super Massive Black Hole | | Łukasz Wyrzykowski
; M.Zieliński
; Z.Kostrzewa-Rutkowska
; A.Hamanowicz
; P.G.Jonker
; I.Arcavi
; J.Guillochon
; P.J.Brown
; S.Kozłowski
; A.Udalski
; M.K.Szymański
; I.Soszyński
; R.Poleski
; P.Pietrukowicz
; J.Skowron
; P.Mróz
; K.Ulaczyk
; M.Pawlak
; K.A.Rybicki
; J.Greiner
; T.Krühler
; J.Bolmer
; | | Date: |
9 Jun 2016 | | Abstract: | We present the discovery and first three months of follow-up observations of
a currently on-going unusual transient detected by the OGLE-IV survey, located
in the centre of a galaxy at redshift z=0.1655. The long rise to absolute
magnitude of -20.5 mag, slow decline, very broad He and H spectral features
make OGLE16aaa similar to other optical/UV Tidal Disruption Events (TDEs). Weak
narrow emission lines in the spectrum and archival photometric observations
suggest the host galaxy is a weak-line Active Galactic Nucleus (AGN), which has
been accreting at higher rate in the past. OGLE16aaa, along with SDSS J0748,
seems to form a sub-class of TDEs by weakly or recently active supermassive
black holes (SMBHs). This class might bridge the TDEs by quiescent SMBHs and
flares observed as "changing-look QSOs", if we interpret the latter as TDEs. If
this picture is true, the previously applied requirement for identifying a
flare as a TDE that it had to come from an inactive nucleus, could be leading
to observational bias in TDE selection, thus affecting TDE-rate estimations. | | Source: | arXiv, 1606.3125 | | Services: | Forum | Review | PDF | Favorites | |
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