Zobrazeno 1 - 10
of 62
pro vyhledávání: '"UMBREIT, STEFAN"'
Autor:
Morscher, Meagan, Pattabiraman, Bharath, Rodriguez, Carl, Rasio, Frederic A., Umbreit, Stefan
Our current understanding of the stellar initial mass function and massive star evolution suggests that young globular clusters may have formed hundreds to thousands of stellar-mass black holes, the remnants of stars with initial masses from $\sim 20
Externí odkaz:
http://arxiv.org/abs/1409.0866
Publikováno v:
2013, ApJ, 763, L15
Globular clusters should be born with significant numbers of stellar-mass black holes (BHs). It has been thought for two decades that very few of these BHs could be retained through the cluster lifetime. With masses ~10 MSun, BHs are ~20 times more m
Externí odkaz:
http://arxiv.org/abs/1211.3372
We study the dynamical evolution of globular clusters using our H\'enon-type Monte Carlo code for stellar dynamics including all relevant physics such as two-body relaxation, single and binary stellar evolution, Galactic tidal stripping, and strong i
Externí odkaz:
http://arxiv.org/abs/1207.3063
Autor:
Umbreit, Stefan, Rasio, Frederic A.
Decades after the first predictions of intermediate-mass black holes (IMBHs) in globular clusters (GCs) there is still no unambiguous observational evidence for their existence. The most promising signatures for IMBHs are found in the cores of GCs, w
Externí odkaz:
http://arxiv.org/abs/1207.2497
Autor:
Pattabiraman, Bharath, Umbreit, Stefan, Liao, Wei-Keng, Choudhary, Alok, Kalogera, Vassiliki, Memik, Gokhan, Rasio, Frederic A.
We present a new parallel code for computing the dynamical evolution of collisional N-body systems with up to N~10^7 particles. Our code is based on the the Henon Monte Carlo method for solving the Fokker-Planck equation, and makes assumptions of sph
Externí odkaz:
http://arxiv.org/abs/1206.5878
Autor:
Leigh, Nathan, Umbreit, Stefan, Sills, Alison, Knigge, Christian, de Marchi, Guido, Glebbeek, Evert, Sarajedini, Ata
We present a new technique to quantify cluster-to-cluster variations in the observed present-day stellar mass functions of a large sample of star clusters. Our method quantifies these differences as a function of both the stellar mass and the total c
Externí odkaz:
http://arxiv.org/abs/1202.2851
A promising mechanism to form intermediate-mass black holes (IMBHs) is the runaway merger in dense star clusters, where main-sequence stars collide and form a very massive star (VMS), which then collapses to a black hole. In this paper we study the e
Externí odkaz:
http://arxiv.org/abs/1105.5884
Publikováno v:
Astrophys.J.719:915-930,2010
We study the dynamical evolution of globular clusters containing primordial binaries, including full single and binary stellar evolution using our Monte Carlo cluster evolution code updated with an adaptation of the single and binary stellar evolutio
Externí odkaz:
http://arxiv.org/abs/0912.4682
Autor:
Chatterjee, Sourav, Goswami, Sanghamitra, Umbreit, Stefan, Glebbeek, Evert, Rasio, Frederic A., Hurley, Jarrod
We study the dynamical evolution of the young star cluster Arches and its dependence on the assumed initial stellar mass function (IMF). We perform many direct $N$-body simulations with various initial conditions and two different choices of IMFs. On
Externí odkaz:
http://arxiv.org/abs/0911.1483