The Structure of Tidal Disruption Event Host Galaxies on Scales of Tens to Thousands of Parsecs
| Autor: | Sjoert van Velzen, Ann I. Zabludoff, Iair Arcavi, Daichi Hiramatsu, K. Decker French, Nicholas Stone, Curtis McCully, Ning Jiang |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) Supermassive black hole 010504 meteorology & atmospheric sciences Stellar mass Star formation FOS: Physical sciences Astronomy and Astrophysics Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Galaxy Early type Tidal disruption event Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Astrophysics::Earth and Planetary Astrophysics Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Schwarzschild radius Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences |
| DOI: | 10.48550/arxiv.2002.02498 |
| Popis: | We explore the galaxy structure of four tidal disruption event (TDE) host galaxies on 30 pc to kpc scales using HST WFC3 multi-band imaging. The star formation histories of these hosts are diverse, including one post-starburst galaxy (ASASSN-14li), two hosts with recent weak starbursts (ASASSN-14ae and iPTF15af), and one early type (PTF09ge). Compared to early type galaxies of similar stellar masses, the TDE hosts have higher central surface brightnesses and stellar mass surface densities on 30-100 pc scales. The TDE hosts do not show the large, kpc-scale tidal disruptions seen in some post-starburst galaxies; the hosts have low morphological asymmetries similar to those of early type galaxies. The lack of strong asymmetries are inconsistent with a recent major (~1:1 mass) merger, although minor ($\lesssim$1:3) mergers are possible. Given the time elapsed since the end of the starbursts in the three post-burst TDE hosts and the constraints on the merger mass ratios, it is unlikely that a bound supermassive black hole binary (SMBHB) has had time to coalesce. The TDE hosts have low central ( Accepted for publication in ApJ. 22 pages, 12 figures |
| Databáze: | OpenAIRE |
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