IS THERE A MAXIMUM MASS FOR BLACK HOLES IN GALACTIC NUCLEI?

被引:36
作者
Inayoshi, Kohei [1 ]
Haiman, Zoltan [1 ]
机构
[1] Columbia Univ, Dept Astron, 550 West 120th St, New York, NY 10027 USA
关键词
black hole physics; galaxies: active; quasars: supermassive black holes; DIGITAL-SKY-SURVEY; ADVECTION-DOMINATED ACCRETION; EARLY-TYPE GALAXIES; OBSERVATIONAL CONSTRAINTS; LUMINOSITY FUNCTION; ELLIPTIC GALAXIES; HIGH-REDSHIFT; QUASAR SURVEY; GROWTH-RATE; DUTY CYCLE;
D O I
10.3847/0004-637X/828/2/110
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The largest observed supermassive black holes (SMBHs) have a mass of M-BH similar or equal to 10(10) M-circle dot, nearly independent of redshift, from the local (z similar or equal to 0) to the early (z > 6) universe. We suggest that the growth of SMBHs above a few x 10(10) M-circle dot is prevented by small-scale accretion physics, independent of the properties of their host galaxies or of cosmology. Growing more massive BHs requires a gas supply rate from galactic scales onto a nuclear region as high as greater than or similar to 10(3) M-circle dot yr(-1). At such a high accretion rate, most of the gas converts to stars at large radii (similar to 10-100 pc), well before reaching the BH. We adopt a simple model for a star-forming accretion disk. and find that the accretion rate in the subparsec nuclear region is reduced to the smaller value of at most a few xM(circle dot) yr(-1). This prevents SMBHs from growing above similar or equal to 10(11)M(circle dot) in the age of the universe. Furthermore, once an SMBH reaches a sufficiently high mass, this rate falls below the critical value at which the accretion flow becomes advection dominated. Once this transition occurs, BH feeding can be suppressed by strong outflows and jets from hot gas near the BH. We find that the maximum SMBH mass, given by this transition, is between M-BH,M-max similar or equal to (1 - 6) x 10(10) M-circle dot, depending primarily on the efficiency of angular momentum transfer inside the galactic disk, and not on other properties of the host galaxy.
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页数:8
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