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A continuum of H- to He-rich tidal disruption candidates with a preference for E+A galaxies

Arcavi, I and Gal-Yam, A and Sullivan, M and Pan, YC and Cenko, SB and Horesh, A and Ofek, EO and De Cia, A and Yan, L and Yang, CW and Howell, DA and Tal, D and Kulkarni, SR and Tendulkar, SP and Tang, S and Xu, D and Sternberg, A and Cohen, JG and Bloom, JS and Nugent, PE and Kasliwal, MM and Perley, DA and Quimby, RM and Miller, AA and Theissen, CA and Laher, RR (2014) A continuum of H- to He-rich tidal disruption candidates with a preference for E+A galaxies. The Astrophysical Journal, 793 (1). ISSN 1538-4357

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Abstract

The American Astronomical Society. All rights reserved.We present the results of a Palomar Transient Factory (PTF) archival search for blue transients that lie in the magnitude range between "normal" core-collapse and superluminous supernovae (i.e., with -21 ≤ MR(peak)≤-19). Of the six events found after excluding all interacting Type IIn and Ia-CSM supernovae, three (PTF09ge, 09axc, and 09djl) are coincident with the centers of their hosts, one (10iam) is offset from the center, and a precise offset cannot be determined for two (10nuj and 11glr). All the central events have similar rise times to the He-rich tidal disruption candidate PS1-10jh, and the event with the best-sampled light curve also has similar colors and power-law decay. Spectroscopically, PTF09ge is He-rich, while PTF09axc and 09djl display broad hydrogen features around peak magnitude. All three central events are in low star formation hosts, two of which are E+A galaxies. Our spectrum of the host of PS1-10jh displays similar properties. PTF10iam, the one offset event, is different photometrically and spectroscopically from the central events, and its host displays a higher star formation rate. Finding no obvious evidence for ongoing galactic nuclei activity or recent star formation, we conclude that the three central transients likely arise from the tidal disruption of a star by a supermassive black hole. We compare the spectra of these events to tidal disruption candidates from the literature and find that all of these objects can be unified on a continuous scale of spectral properties. The accumulated evidence of this expanded sample strongly supports a tidal disruption origin for this class of nuclear transients. © 2014.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 23 May 2017 10:55
Last Modified: 23 May 2017 10:55
DOI or Identification number: 10.1088/0004-637X/793/1/38
URI: http://researchonline.ljmu.ac.uk/id/eprint/6513

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