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dc.contributor.authorPerlman, Eric S.
dc.contributor.authorMeyer, Eileen T.
dc.contributor.authorWang, Q. Daniel
dc.contributor.authorYuan, Qiang
dc.contributor.authorHenriksen, Richard N.
dc.contributor.authorIrwin, Judith A.
dc.contributor.authorKrause, Marita
dc.contributor.authorWiegert, Theresa
dc.contributor.authorMurphy, Eric J.
dc.contributor.authorHeald, George H.
dc.date.accessioned2017-10-06T17:39:28Z
dc.date.available2017-10-06T17:39:28Z
dc.date.issued2017-07-22
dc.identifier.citationPerlman, E.S., Meyer, E.T., Wang, Q.D., Yuan, Q., Henriksen, R., Irwin, J., Krause, M., Wiegert, T., Murphy, E.J., Heald, G., Dettmar, R.-J. Compact resolved ejecta in the nearest tidal disruption event (2017) Astrophysical Journal, 842 (2), art. no. 126, .en_US
dc.identifier.urihttp://hdl.handle.net/11141/1821
dc.descriptiongalaxies: active, galaxies: individual (NGC 4845), galaxies: nuclei, radio continuum: galaxiesen_US
dc.description.abstractTidal disruption events (TDEs) occur when a star or substellar object passes close enough to a galaxy's supermassive black hole to be disrupted by tidal forces. NGC 4845 (d = 17 Mpc) was host to a TDE, IGR J12580+0134, detected in 2010 November. Its proximity offers us a unique close-up of the TDE and its aftermath. We discuss new Very Long Baseline Array (VLBA) and Karl G. Jansky Very Large Array observations, which show that the radio flux from the active nucleus created by the TDE has decayed in a manner consistent with predictions from a jet-circumnuclear medium interaction model. This model explains the source's broadband spectral evolution, which shows a spectral peak that has moved from the submillimeter (at the end of 2010) to GHz radio frequencies (in 2011-2013) to in 2015. The milliarcsecond-scale core is circularly polarized at 1.5 GHz but not at 5 GHz, consistent with the model. The VLBA images show a complex structure at 1.5 GHz that includes an east-west extension that is ∼40 mas (3 pc) long, as well as a resolved component that is 52 mas (4.1 pc) northwest of the flat-spectrum core, which is all that can be seen at 5 GHz. If ejected in 2010, the northwest component must have had over five years. However, this is unlikely, as our model suggests strong deceleration to speeds within months and a much smaller, sub-parsec size. In this interpretation, the northwest component could have either a non-nuclear origin or be from an earlier event. © 2017. The American Astronomical Society. All rights reserved..en_US
dc.language.isoen_USen_US
dc.rights© 2017 The American Astronomical Society. All rights reserved.en_US
dc.rights.urihttp://journals.aas.org/authors/apc.htmlen_US
dc.titleCompact resolved ejecta in the nearest tidal disruption eventen_US
dc.typeArticleen_US
dc.identifier.doi10.3847/1538-4357/aa71b1


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