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Discovery and follow-up of the unusual nuclear transient OGLE17aaj

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Zeitschriftentitel: Astronomy & Astrophysics
Personen und Körperschaften: 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., Rybicki, K. A., Sollerman, J., Taddia, F., Kostrzewa-Rutkowska, Z., Onori, F., Young, D. R., Maguire, K., Smartt, S. J., Inserra, C., Gal-Yam, A., Rau, A., Chen, T.-W., Angus, C. R., Buckley, D. A. H.
In: Astronomy & Astrophysics, 622, 2019, S. L2
Format: E-Article
Sprache: Unbestimmt
veröffentlicht:
EDP Sciences
Schlagwörter:
Space and Planetary Science
Astronomy and Astrophysics
Details
Zusammenfassung: <jats:p><jats:italic>Aims</jats:italic>. 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).</jats:p> <jats:p><jats:italic>Methods</jats:italic>. 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.</jats:p> <jats:p><jats:italic>Results</jats:italic>. 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.</jats:p>
Umfang: L2
ISSN: 1432-0746
0004-6361
DOI: 10.1051/0004-6361/201833682