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Discovery and follow-up of the unusual nuclear transient OGLE17aaj
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Number of Authors: 342019 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 622, article id L2Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2019. Vol. 622, article id L2
Keywords [en]
black hole physics, Galaxy: nucleus
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-166794DOI: 10.1051/0004-6361/201833682ISI: 000456679800002OAI: oai:DiVA.org:su-166794DiVA, id: diva2:1295520
Available from: 2019-03-12 Created: 2019-03-12 Last updated: 2019-03-12Bibliographically approved

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Fraser, M.Sollerman, JesperTaddia, FrancescoInserra, C.
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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