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PS1-13cbe: the rapid transition of a Seyfert 2 to a Seyfert 1
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Number of Authors: 142019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 487, no 3, p. 4057-4070Article in journal (Refereed) Published
Abstract [en]

We present a nuclear transient event, PS1-13cbe, that was first discovered in the Pan-STARRS1 survey in 2013. The outburst occurred in the nucleus of the galaxy SDSS J222153.87+003054.2 at z = 0.123 55, which was classified as a Seyfert 2 in a pre-outburst archival Sloan Digital Sky Survey (SDSS) spectrum. PS1-13cbe showed the appearance of strong broad H alpha and H beta emission lines and a non-stellar continuum in a Magellan spectrum taken 57 d after the peak of the outburst that resembled the characteristics of a Seyfert 1. These broad lines were not present in the SDSS spectrum taken a decade earlier and faded away within 2 yr, as observed in several late-time MDM spectra. We argue that the dramatic appearance and disappearance of the broad lines and a factor of similar to 8 increase in the optical continuum are most likely caused by variability in the pre-existing accretion disc than a tidal disruption event, supernova, or variable obscuration. The time-scale for the turn-on of the optical emission of similar to 70 d observed in this transient is among the shortest observed in a 'changing-look' active galactic nucleus,

Place, publisher, year, edition, pages
2019. Vol. 487, no 3, p. 4057-4070
Keywords [en]
accretion, accretion discs, black hole physics, galaxies: active, galaxies: nuclei
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-171681DOI: 10.1093/mnras/stz1552ISI: 000478053200080OAI: oai:DiVA.org:su-171681DiVA, id: diva2:1344520
Available from: 2019-08-21 Created: 2019-08-21 Last updated: 2019-08-21Bibliographically approved

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Lunnan, Ragnhild
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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