期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 493, 期 1, 页码 477-495出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa186
关键词
galaxies: active; quasars: supermassive black holes; galaxies: nuclei; accretion, accretion discs; transients: tidal disruption events; quasars: individual: Gaia16aax
资金
- European Research Council [647208]
- Royal Society - Science Foundation Ireland University Research Fellowship
- H2020 European Hemera programme [730970]
- Finnish Cultural Foundation
- Vilho, Yrjo and Kalle Vaisala Foundation (of the Finnish Academy of Science and Letters)
- National Science Foundation [1831412]
- Science and Technology Facilities Council (STFC) [ST/M005917/1]
- European Space Agency (ESA) Gaia, the Data Processing Analysis and Consortium (DPAC)
- Photometric Science Alerts Team
- Nordic Optical Telescope (NOT)
- Nordic Optical Telescope Scientific Association (NOTSA) at the Observatorio del Roque de los Muchachos
- IDA (The Instrument Centre for Danish Astronomy)
- Instituto de Astrofisica de Andalucia (IAA)
- University of Copenhagen
- UK (STFC) - National Aeronautics and Space Administration (NASA)
- U.S. National Science Foundation [AST-0909182, AST-1313422]
- ESA Member States
- STFC [ST/S006176/1, ST/P006892/1, ST/M005917/1] Funding Source: UKRI
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1831412] Funding Source: National Science Foundation
We present the results of a multiwavelength follow-up campaign for the luminous nuclear transient Gaia16aax, which was first identified in 2016 January. The transient is spatially consistent with the nucleus of an active galaxy at z = 0.25, hosting a black hole of mass similar to 6 x 10(8) M-circle dot. The nucleus brightened by more than 1 mag in the Gaia G band over a time-scale of less than 1 yr, before fading back to its pre-outburst state over the following 3 yr. The optical spectra of the source show broad Balmer lines similar to the ones present in a preoutburst spectrum. During the outburst, the H alpha and H beta emission lines develop a secondary peak. We also report on the discovery of two transients with similar light-curve evolution and spectra: Gaia16aka and Gaia16ajq. We consider possible scenarios to explain the observed outbursts. We exclude that the transient event could be caused by amicrolensing event, variable dust absorption or a tidal encounter between a neutron star and a stellar mass black hole in the accretion disc. We consider variability in the accretion flow in the inner part of the disc, or a tidal disruption event of a star >= 1 M-circle dot by a rapidly spinning supermassive black hole as the most plausible scenarios. We note that the similarity between the light curves of the three Gaia transients may be a function of the Gaia alerts selection criteria.
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