Quick Search:

uzh logo
Browse by:
bullet
bullet
bullet
bullet

Zurich Open Repository and Archive 

Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-30887

Callegari, S; Mayer, L; Kazantzidis, S; Colpi, M; Governato, F; Quinn, T; Wadsley, J (2009). Pairing of Supermassive Black Holes in unequal-mass galaxy mergers. Astrophysical Journal Letters, 696(1):L89-L92.

[img] PDF (Verlags-PDF) - Registered users only
1MB
[img]
Preview
Accepted Version
PDF (Accepted manuscript, Version 2)
1MB
[img]
Preview
Accepted Version
PDF (Accepted manuscript, Version 1)
150kB

Abstract

We examine the pairing process of supermassive black holes (SMBHs) down to scales of 20-100 pc using a set of N-body/SPH simulations of binary mergers of disk galaxies with mass ratios of 1:4 and 1:10. Our numerical experiments are designed to represent merger events occurring at various cosmic epochs. The initial conditions of the encounters are consistent with the ΛCDM paradigm of structure formation, and the simulations include the effects of radiative cooling, star formation (SF), and supernovae feedback. We find that the pairing of SMBHs depends sensitively on the amount of baryonic mass preserved in the center of the companion galaxies during the last phases of the merger. In particular, due to the combination of gasdynamics and SF, we find that a pair of SMBHs can form efficiently in 1:10 minor mergers, provided that galaxies are relatively gas-rich (gas fractions of 30% of the disk mass) and that the mergers occur at relatively high redshift (z ~ 3), when dynamical friction timescales are shorter. Since 1:10 mergers are most common events during the assembly of galaxies, and mergers are more frequent at high redshift when galaxies are also more gas-rich, our results have positive implications for future gravitational wave experiments such as the Laser Interferometer Space Antenna.

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
DDC:530 Physics
Language:English
Date:May 2009
Deposited On:22 Feb 2010 09:59
Last Modified:27 Nov 2013 17:40
Publisher:Institute of Physics Publishing
ISSN:2041-8205
Funders:CCAPP, Ohio State University , NSF [AST-0607818], NASA [NNX07AH03G]
Publisher DOI:10.1088/0004-637X/696/1/L89
Related URLs:http://arxiv.org/abs/arxiv:0811.0615
Citations:Web of Science®. Times Cited: 40
Google Scholar™
Scopus®. Citation Count: 42

Users (please log in): suggest update or correction for this item

Repository Staff Only: item control page