Compact Resolved Ejecta in the Nearest Tidal Disruption Event
Perlman, Eric S.1; Meyer, Eileen T.2; Wang, Q. Daniel3; Yuan, Qiang3,4; Henriksen, Richard5; Irwin, Judith5; Krause, Marita6; Wiegert, Theresa5; Murphy, Eric J.7; Heald, George8,9; Dettmar, Ralf-Juergen10

Tidal 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 vertical bar 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 < 1 GHz 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 similar to 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 v = 0.96c over five years. However, this is unlikely, as our model suggests strong deceleration to speeds < 0.5c 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.

Keywordgalaxies: active galaxies: individual (NGC 4845) galaxies: nuclei radio continuum: galaxies
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000404341300008
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorPerlman, Eric S.
Affiliation1.Florida Inst Technol, Dept Phys & Space Sci, 150 W Univ Blvd, Melbourne, FL 32901 USA
2.Univ Maryland Baltimore Cty, Dept Phys, 1000 Hilltop Circle, Baltimore, MD 21250 USA
3.Univ Massachusetts, Dept Astron, LGRT-B 619E,710 North Pleasant St, Amherst, MA 01003 USA
4.Chinese Acad Sci, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiansu, Peoples R China
5.Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON K7L 3N6, Canada
6.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
7.CALTECH, US Planck Data Ctr, MC 220-6, Pasadena, CA 91125 USA
8.CSIRO Astron & Space Sci, 26 Dick Perry Ave, Kensington, WA 6151, Australia
9.Kapteyn Astron Inst, POB 800, NL-9700 AV Groningen, Netherlands
10.Ruhr Univ Bochum, Fac Phys & Astron, Astron Inst, D-44780 Bochum, Germany
Recommended Citation
GB/T 7714
Perlman, Eric S.,Meyer, Eileen T.,Wang, Q. Daniel,et al. Compact Resolved Ejecta in the Nearest Tidal Disruption Event[J]. ASTROPHYSICAL JOURNAL,2017,842(2):9.
APA Perlman, Eric S..,Meyer, Eileen T..,Wang, Q. Daniel.,Yuan, Qiang.,Henriksen, Richard.,...&Dettmar, Ralf-Juergen.(2017).Compact Resolved Ejecta in the Nearest Tidal Disruption Event.ASTROPHYSICAL JOURNAL,842(2),9.
MLA Perlman, Eric S.,et al."Compact Resolved Ejecta in the Nearest Tidal Disruption Event".ASTROPHYSICAL JOURNAL 842.2(2017):9.
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