Discovery and follow-up of the unusual nuclear transient OGLE17aaj
Gromadzki M; Hamanowicz A; Wyrzykowski L; Sokolovsky KV; Fraser M; Kozlowski S; Guillochon J; Arcavi I; Trakhtenbrot B; Jonker PG; Mattila S; Udalski A; Szymanski MK; Soszynski I; Poleski R; Pietrukowicz P; Skowron J; Mroz P; Ulaczyk K; Pawlak M; Rybicki KA; Sollerman J; Taddia F; Kostrzewa-Rutkowska Z; Onori F; Young DR; Maguire K; Smartt SJ; Inserra C; Gal-Yam A; Rau A; Chen TW; Angus CR; Buckley DAH; Buckley DAH
https://urn.fi/URN:NBN:fi-fe2021042825965
Tiivistelmä
Aims
We report on the discovery and follow-up of a peculiar transient, OGLE17aaj, which occurred in the nucleus of a weakly active galaxy. We investigate whether it can be interpreted as a new candidate for a tidal disruption event (TDE).
Methods
We present the OGLE-IV light curve that covers the slow 60-day-long rise to maximum along with photometric, spectro-scopic, and X-ray follow-up during the first year.
Results
OGLE17aaj is a nuclear transient exhibiting some properties similar to previously found TDEs, including a long rise time, lack of colour-temperature evolution, and high black-body temperature. On the other hand, its narrow emission lines and slow post-peak evolution are different from previously observed TDEs. Its spectrum and light-curve evolution is similar to F01004-2237 and AT 2017bgt. Signatures of historical low-level nuclear variability suggest that OGLE17aaj may instead be related to a new type of accretion event in active super-massive black holes.
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