A continuum of H- to He-rich tidal disruption candidates with a preference for E+A galaxies
| Autor: | Assaf Sternberg, Christopher A. Theissen, Shriharsh P. Tendulkar, Mark Sullivan, Russ R. Laher, Dale Andrew Howell, Annalisa De Cia, Assaf Horesh, Dong Xu, Joshua S. Bloom, Avishay Gal-Yam, Yen-Chen Pan, Lin Yan, Judith G. Cohen, Mansi M. Kasliwal, Daniel A. Perley, Iair Arcavi, Sumin Tang, Adam A. Miller, S. Bradley Cenko, Chen-Wei Yang, Peter Nugent, Eran O. Ofek, Robert M. Quimby, Shrinivas R. Kulkarni, D. Tal |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
astro-ph.GA
nuclei [galaxies] FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astronomy & Astrophysics Galactic nuclei Atomic Spectral line Particle and Plasma Physics accretion Coincident Nuclear QC Astrophysics::Galaxy Astrophysics QB Physics High Energy Astrophysical Phenomena (astro-ph.HE) astro-ph.HE Star formation accretion disks supermassive black holes [quasars] Spectral properties Molecular Astronomy and Astrophysics Light curve Astrophysics - Astrophysics of Galaxies Galaxy Supernova Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics Astrophysics - High Energy Astrophysical Phenomena Astronomical and Space Sciences Physical Chemistry (incl. Structural) |
| Zdroj: | Astrophysical Journal, vol 793, iss 1 The Astrophysical Journal, vol 793, iss 1 |
| ISSN: | 1538-4357 |
| Popis: | We present the results of a Palomar Transient Factory (PTF) archival search for blue transients which lie in the magnitude range between "normal" core-collapse and superluminous supernovae (i.e. with $-21\,{\leq}M_{R\,(peak)}\,{\leq}-19$). 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 for two (10nuj and 11glr) a precise offset can not be determined. 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 super-massive 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. Comment: Minor changes and clarifications, added radio non-detection limits for one of the events, accepted to ApJ |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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