GRRMHD simulations of tidal disruption event accretion discs around supermassive black holes: jet formation, spectra, and detectability

被引:68
作者
Curd, Brandon [1 ]
Narayan, Ramesh [1 ]
机构
[1] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
关键词
accretion; accretion discs; black hole physics; MHD; radiative transfer; gamma-rays: galaxies; X-rays: galaxies; RELATIVISTIC RADIATIVE POSTPROCESSOR; MAGNETICALLY ARRESTED ACCRETION; MAGNETOHYDRODYNAMIC SIMULATIONS; STAR; FLOWS; ENERGY; CONSEQUENCES; LUMINOSITY; EVOLUTION; OUTBURST;
D O I
10.1093/mnras/sty3134
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report results from general relativistic radiation magnetohydrodynamics (GRRMHD) simulations of a super-Eddington black hole (BH) accretion disc formed as a result of a tidal disruption event (TDE). We consider the fiducial case of a solar mass star on a mildly ;penetrating orbit disrupted by a supermassive BH of mass 10(6) M-circle dot, and consider the epoch of peak fallback rate. We post-process the simulation data to compute viewing angle-dependent spectra. We perform a parameter study of the dynamics of the accretion disc as a function of BH spin and magnetic flux, and compute model spectra as a function of the viewing angle of the observer. We also consider detection limits based on the model spectra. We find that an accretion disc with a relatively weak magnetic field around the BH [so-called SANE (Standard and Normal Evolution) regime of accretion] does not launch a relativistic jet, whether or not the BH is rotating. Such models reasonably reproduce several observational properties of non-jetted TDEs. The same is also true for a non-rotating BH with a strong magnetic field (magnetically arrested accretion disc, MAD regime). One of our simulations has a rapidly rotating BH (spin parameter 0.9) as well as a MAD accretion disc. This model launches a powerful relativistic jet, which is powered by the BH spin energy. It reproduces the high-energy emission and jet structure of the jetted TDE Swift J1644 + 57 surprisingly well. Jetted TDEs may thus correspond to the subset of TDE systems that have both a rapidly spinning BH and MAD accretion.
引用
收藏
页码:565 / 592
页数:28
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