Query : 2010A&A...521A..55C

2010A&A...521A..55C - Astronomy and Astrophysics, volume 521, A55-55 (2010/10-1)

The mass function of nearby black hole candidates.


Abstract (from CDS):

The mass function of supermassive black holes in our cosmic neighborhood is required to understand the statistics of their activity and consequently the origin of ultra high energy particles. We determine a mass function of supermassive black hole candidates from the entire sky except for the Galactic plane. Using the 2MASS catalogue as a starting point, and the well-established correlation between black hole mass and the bulge of old population of stars, we derive a list of nearby black hole candidates within the redshift range z<0.025, then perform an additional selection based on the Hubble type. We present our resulting catalogue elsewhere. The final list of black hole candidates above a mass of MBH>3x106M has 5829 entries. We perform a Hubble-type correction to account for selection effects, which reduces this number to 2919 black hole candidates. Here we use this catalogue to derive the black-hole mass function. We also correct for volume, so that this mass function is a volume-limited distribution to redshift 0.025. The differential mass function of nearby black hole candidates is a curved function, with a straight simple power-law of index -3 above 108M that becomes progressively flatter towards lower masses, turns off towards a gap below 3x106M, and then extends into the range where nuclear star clusters replace black holes. The shape of this mass function can be explained in a simple merger picture. Integrating this mass function over the redshift range for which it has been derived, infers a total number of black holes with z<0.025, and MBH>107M of about 2.4x104, or, if we average uniformly, 0.6 for every square degree on the sky.

Abstract Copyright:

Journal keyword(s): black hole physics - galaxies: general - acceleration of particles

VizieR on-line data: <Available at CDS (J/A+A/521/A55): bh.dat>

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME Mayall II GlC 00 32 46.5323801712 +39 34 40.504803060   14.564 13.807 13.208 12.684 ~ 388 1
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12388 1
3 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6509 0
4 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13909 0
5 NAME Local Group GrG ~ ~           ~ 8155 0

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