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Discovery and follow-up of the unusual nuclear transient OGLE17aaj.
- Source :
-
Astronomy & Astrophysics / Astronomie et Astrophysique . Feb2019, Vol. 622, pN.PAG-N.PAG. 5p. - Publication Year :
- 2019
-
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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ACCRETION (Astrophysics)
*ACTIVE galaxies
*BLACK holes
Subjects
Details
- Language :
- English
- ISSN :
- 00046361
- Volume :
- 622
- Database :
- Academic Search Index
- Journal :
- Astronomy & Astrophysics / Astronomie et Astrophysique
- Publication Type :
- Academic Journal
- Accession number :
- 135230740
- Full Text :
- https://doi.org/10.1051/0004-6361/201833682