2015ApJ...806..220A -
Astrophys. J., 806, 220 (2015/June-3)
Henize 2-10: the ongoing formation of a nuclear star cluster around a massive black hole.
ARCA-SEDDA M., CAPUZZO-DOLCETTA R., ANTONINI F. and SETH A.
Abstract (from CDS):
The central region of the galaxy Henize 2-10 hosts a black hole (BH) candidate with a mass Log(MBH/M☉) = 6.3 ± 1.1. While this putative BH does not appear to coincide with any central stellar overdensity, it is surrounded by 11 young massive clusters with masses above 105 M☉. The availability of high-quality data on the structure of the galaxy and the age and mass of the clusters provides excellent initial conditions for studying the dynamical evolution of Henize 2-10's nucleus. Here we present a set of N-body simulations in which we model the future evolution of the central clusters and the BH to understand whether and how they will merge to form a nuclear star cluster (NSC). NSCs are present in a majority of galaxies with stellar mass similar to Henize 2-10. While the results depend on the choice of initial conditions, we find that an NSC with mass MNSC ~= 4-6 x 106M☉ and effective radius rNSC ~= 2.6 -4.1 pc will form within 0.2 Gyr. This work is the first showing, in a realistic realization of the host galaxy and its star cluster system, that the formation of a bright nucleus is a process that can happen after the formation of a central massive BH leading to a composite NSC+BH central system. The cluster merging process does not significantly affect the kinematics of the BH; when a stationary state is reached, its position changes by ≲ 1 pc and its velocity by < 2 km/s.
Abstract Copyright:
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Journal keyword(s):
galaxies: individual: Henize 2-10 - galaxies: nuclei - galaxies: star clusters: general - methods: numerical
Simbad objects:
3
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