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- Title
Discovery and follow-up of the unusual nuclear transient OGLE17aaj.
- Authors
Gromadzki, M.; Hamanowicz, A.; Wyrzykowski, L.; Sokolovsky, K. V.; Fraser, M.; Kozłowski, Sz.; Guillochon, J.; Arcavi, I.; Trakhtenbrot, B.; Jonker, P. G.; Mattila, S.; Udalski, A.; Szymański, M. K.; Soszyński, I.; Poleski, R.; Pietrukowicz, P.; Skowron, J.; Mróz, P.; Ulaczyk, K.; Pawlak, M.
- Abstract
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, spectroscopic, 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.
- Subjects
ACCRETION (Astrophysics); ACTIVE galaxies; BLACK holes
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2019, Vol 622, pN.PAG
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201833682