ASASSN-15lh: a TDE about a maximally rotating 109 M⊙ black hole
| Autor: | Andrew Mummery, Steven A. Balbus |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) Photon Accretion (meteorology) 010308 nuclear & particles physics Infrared Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astronomy and Astrophysics Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Light curve Rotation 01 natural sciences Tidal disruption event Black hole Space and Planetary Science 0103 physical sciences Astrophysics::Earth and Planetary Astrophysics Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Scaling Astrophysics::Galaxy Astrophysics |
| Popis: | We model the light curves of the novel and extremely luminous transient ASASSN-15lh at nine different frequencies, from infrared to ultra-violet photon energies, as an evolving relativistic disc produced in the aftermath of a tidal disruption event. Good fits to all nine light curves are simultaneously obtained when $M_{\rm acc} \simeq 0.07 M_{\odot}$ is accreted onto a black hole of mass $M \simeq 10^9 M_{\odot}$, and near maximal rotation $a/r_g = 0.99$. The best fit black hole mass is consistent with a number of existing estimates from galactic scaling relationships. If confirmed, our results represent the detection of one of the most massive rapidly spinning black holes to date, and are strong evidence for a TDE origin for ASASSN-15lh. This would be the first TDE to be observed in the disc dominated state at optical and infrared frequencies. 5 pages, 4 figures, accepted for publication in MNRAS Letters. Comments welcome |
| Databáze: | OpenAIRE |
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