Zobrazeno 1 - 10
of 179
pro vyhledávání: '"Alexander Tal"'
Autor:
Alexander, Tal
Extreme mass ratio inspiral (EMRI) events are vulnerable to perturbations by the stellar background, which can abort them prematurely by deflecting EMRI orbits to plunging ones that fall directly into the massive black hole (MBH), or to less eccentri
Externí odkaz:
http://arxiv.org/abs/1702.00597
Autor:
Alexander, Tal
Most galactic nuclei harbor a massive black hole (MBH), whose birth and evolution are closely linked to those of its host galaxy. The unique conditions near the MBH: high velocity and density in the steep potential of a massive singular relativistic
Externí odkaz:
http://arxiv.org/abs/1701.04762
Autor:
Alexander, Tal, Bar-Or, Ben
Publikováno v:
Nature Astronomy 1, Article number: 0147 (2017)
Intermediate-mass black holes (IMBHs) of mass $M_{\bullet} \approx 10^{2} - 10^{5}$ solar masses, $M_{\odot}$, are the long-sought missing link between stellar black holes, born of supernovae, and massive black holes, tied to galaxy evolution by the
Externí odkaz:
http://arxiv.org/abs/1701.00415
Autor:
Bar-Or, Ben, Alexander, Tal
A massive black hole (MBH) consumes stars whose orbits evolve into the small phase-space volume of unstable orbits, the "loss-cone", which take them directly into the MBH, or close enough to interact strongly with it. The resulting phenomena: tidal h
Externí odkaz:
http://arxiv.org/abs/1508.01390
Autor:
Alexander, Tal
I briefly review advances in the understanding and modeling of relativistic stellar dynamics around massive black holes (MBHs) in galactic nuclei, following the inclusion of coherent relaxation and of secular processes in a new formal analytic descri
Externí odkaz:
http://arxiv.org/abs/1505.04823
Autor:
Alexander, Tal, Natarajan, Priyamvada
Publikováno v:
Science, 12 September 2014, Vol. 345 no. 6202 pp. 1330-1333
Mass accretion by black holes (BHs) is typically capped at the Eddington rate, when radiation's push balances gravity's pull. However, even exponential growth at the Eddington-limited e-folding time t_E ~ few x 0.01 billion years, is too slow to grow
Externí odkaz:
http://arxiv.org/abs/1408.1718
Autor:
Bar-Or, Ben, Alexander, Tal
Publikováno v:
Class. Quantum Grav. 31 (2014) 244003
Stars around a massive black hole (MBH) move on nearly fixed Keplerian orbits, in a centrally-dominated potential. The random fluctuations of the discrete stellar background cause small potential perturbations, which accelerate the evolution of orbit
Externí odkaz:
http://arxiv.org/abs/1404.0351
Autor:
Alexander, Tal, Pfuhl, Oliver
Massive black holes (MBHs) in galactic nuclei are believed to be surrounded by a high density stellar cluster, whose mass is mostly in hard-to-detect faint stars and compact remnants. Such dark cusps dominate the dynamics near the MBH: a dark cusp in
Externí odkaz:
http://arxiv.org/abs/1308.6638
Autor:
Alexander, Tal
The cross-correlation function (CCF) is commonly employed in the study of AGN, where it is used to probe the structure of the broad line region by line reverberation, to study the continuum emission mechanism by correlating multi-waveband light curve
Externí odkaz:
http://arxiv.org/abs/1302.1508
Autor:
Alexander, Tal
The disruption of a star by the tidal field of a massive black hole is the final outcome of a chain of complex dynamical processes in the host galaxy. I introduce the "loss cone problem", and describe the many theoretical and numerical challenges on
Externí odkaz:
http://arxiv.org/abs/1210.0582