An upper observable black hole mass scale for tidal disruption events with thermal X-ray spectra
| Autor: | Steven A. Balbus, Andrew Mummery |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) education.field_of_study Accretion (meteorology) 010308 nuclear & particles physics Astrophysics::High Energy Astrophysical Phenomena Population Order (ring theory) FOS: Physical sciences Astronomy and Astrophysics Observable Astrophysics 01 natural sciences Luminosity Black hole General Relativity and Quantum Cosmology Space and Planetary Science 0103 physical sciences Thermal education Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Dimensionless quantity |
| Popis: | We comprehensively model the X-ray luminosity emergent from time dependent relativistic accretion discs, developing analytical models of the X-ray luminosity of thermal disc systems as a function of black hole mass $M$, disc mass $M_d$, and disc $\alpha$-parameter. The X-ray properties of these solutions will be directly relevant for understanding TDE observations. We demonstrate an extremely strong suppression of thermal X-ray luminosity from large mass black holes, $L_X \sim \exp(-m^{7/6})$, where $m$ is a dimensionless mass, roughly the the black hole mass in unity of $10^6$M$_\odot$. This strong suppression results in upper-observable black hole mass limits, which we demonstrate to be of order $M_{\rm lim} \simeq 3 \times 10^7 M_\odot$, above which thermal X-ray emission will not be observable. This upper observable black hole mass limit is a function of the remaining disc parameters, and the full dependence can be described analytically (eq. 82). We demonstrate that the current population of observed X-ray TDEs is indeed consistent with an upper black hole mass limit of order $M \sim 10^7M_\odot$, consistent with our analysis. Comment: v2: Updated with more sources added to Table 2, now matches journal version. v1: 15 pages, 10 figures, 2 tables. Accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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