Discovery and follow-up of the unusual nuclear transient OGLE17aaj
Trakhtenbrot B; Pietrukowicz P; Rybicki KA; Szymanski MK; Poleski R; Buckley DAH; Guillochon J; Rau A; Young DR; Jonker PG; Angus CR; Udalski A; Kozlowski S; Hamanowicz A; Arcavi I; Chen TW; Sollerman J; Mattila S; Wyrzykowski L; Gal-Yam A; Smartt SJ; Maguire K; Gromadzki M; Sokolovsky KV; Mroz P; Soszynski I; Ulaczyk K; Taddia F; Pawlak M; Kostrzewa-Rutkowska Z; Onori F; Skowron J; Inserra C; Fraser M
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.
Kokoelmat
- Rinnakkaistallenteet [19207]