Muse reveals a recent merger in the post-starburst host galaxy of the tde ASASSN-14li

Prieto, J. L.; Krühler, T.; Anderson, J. P.; Galbany, L.; Förster, F.; Kuncarayakti, H.; Kochanek, C. S.; Brown, J. S.; Stanek, K. Z.; Aquino, E.; Sánchez, S. F.; Dong, Subo; Maureira, J. C.; Rosales-Ortega, F. F.; Shappee, B. J.

doi:10.3847/2041-8205/830/2/L32

Title: Muse reveals a recent merger in the post-starburst host galaxy of the tde ASASSN-14li

Journal Article · Thu Oct 20 00:00:00 EDT 2016 · Astrophysical Journal Letters

DOI:https://doi.org/10.3847/2041-8205/830/2/L32· OSTI ID:22868573

Prieto, J. L. ^[1]; Krühler, T. ^[2]; Anderson, J. P. ^[3]; Galbany, L.; Förster, F.; Kuncarayakti, H. ^[4]; Kochanek, C. S.; Brown, J. S.; Stanek, K. Z. ^[5]; Aquino, E.; Sánchez, S. F. ^[6]; Dong, Subo ^[7]; Maureira, J. C. ^[8]; Rosales-Ortega, F. F. ^[9]; Shappee, B. J. ^[10]

Núcleo de Astronomía de la Facultad de Ingeniería, Universidad Diego Portales, Av. Ejército 441, Santiago (Chile)
Max-Planck-Institut für Extraterrestrische Physik (MPE), Giessenbachstrasse 1, D-85748 Garching (Germany)
European Southern Observatory, Alonso de Córdova 3107, Casilla 19001, Santiago (Chile)
Millennium Institute of Astrophysics, Santiago (Chile)
Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States)
Instituto de Astronomía, Universidad Nacional Autónoma de México, A.P. 70-264, 04510, D.F., México (Mexico)
Kavli Institute for Astronomy and Astrophysics, Peking University, Yi He Yuan Road 5, Hai Dian District, Beijing 100871 (China)
Centro de Modelamiento Matemático, Universidad de Chile, Av. Blanco Encalada 2120, Piso 7, Santiago (Chile)
Instituto Nacional de Astrofísica, Óptica y Electrónica, Luis E. Erro 1, 72840 Tonantzintla, Puebla, México (Mexico)
Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101 (United States)

We present Multi Unit Spectroscopic Explorer (MUSE) integral field spectroscopic observations of the host galaxy (PGC 043234) of one of the closest (z = 0.0206, D ≃ 90 Mpc) and best-studied tidal disruption events (TDEs), ASASSN-14li. The MUSE integral field data reveal asymmetric and filamentary structures that extend up to ≳10 kpc from the post-starburst host galaxy of ASASSN-14li. The structures are traced only through the strong nebular [O iii] λ5007, [N ii] λ6584, and Hα emission lines. The total off-nuclear [O iii] λ5007 luminosity is 4.7 × 10{sup 39} erg s{sup −1}, and the ionized H mass is ∼10{sup 4}(500/n{sub e}) M{sub ⊙}. Based on the Baldwin–Phillips–Terlevich diagram, the nebular emission can be driven by either AGN photoionization or shock excitation, with AGN photoionization favored given the narrow intrinsic line widths. The emission line ratios and spatial distribution strongly resemble ionization nebulae around fading AGNs such as IC 2497 (Hanny's Voorwerp) and ionization “cones” around Seyfert 2 nuclei. The morphology of the emission line filaments strongly suggest that PGC 043234 is a recent merger, which likely triggered a strong starburst and AGN activity leading to the post-starburst spectral signatures and the extended nebular emission line features we see today. We briefly discuss the implications of these observations in the context of the strongly enhanced TDE rates observed in post-starburst galaxies and their connection to enhanced theoretical TDE rates produced by supermassive black hole binaries.

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OSTI ID:: 22868573

Journal Information:: Astrophysical Journal Letters, Vol. 830, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205

Country of Publication:: United States

Language:: English

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Title: Muse reveals a recent merger in the post-starburst host galaxy of the tde ASASSN-14li

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