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Title:
The Fate of Supermassive Black Holes and the Evolution of the MBH-σ Relation in Merging Galaxies: The Effect of Gaseous Dissipation
Authors:
Kazantzidis, Stelios; Mayer, Lucio; Colpi, Monica; Madau, Piero; Debattista, Victor P.; Wadsley, James; Stadel, Joachim; Quinn, Thomas; Moore, Ben
Affiliation:
AA(Institute for Theoretical Physics, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland; .), AB(Institute for Theoretical Physics, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland; .), AC(Dipartimento di Fisica G. Occhialini, Università di Milano Bicocca, Piazza della Scienza 3, I-20126 Milan, Italy.), AD(Department of Physics, University of California at Santa Cruz, 1156 High Street, Santa Cruz, CA 95064.), AE(Institut für Astronomie, ETH Zürich, Scheuchzerstrasse 7, CH-8093 Zürich, Switzerland.), AF(Department of Physics and Astronomy, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4M1, Canada.), AG(Institute for Theoretical Physics, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland; .), AH(Department of Astronomy, University of Washington, Physics/Astronomy Building, Stevens Way, Box 351580, Seattle, WA 98195.), AI(Institute for Theoretical Physics, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland; .)
Publication:
The Astrophysical Journal, Volume 623, Issue 2, pp. L67-L70. (ApJL Homepage)
Publication Date:
04/2005
Origin:
UCP
ApJ Keywords:
Black Hole Physics, Cosmology: Theory, Galaxies: Interactions, Hydrodynamics, Methods: Numerical
DOI:
10.1086/430139
Bibliographic Code:
2005ApJ...623L..67K

Abstract

We analyze the effect of dissipation on the orbital evolution of supermassive black holes (SMBHs) using high-resolution self-consistent gasdynamical simulations of binary equal- and unequal-mass mergers of disk galaxies. The galaxy models are consistent with the ΛCDM paradigm of structure formation, and the simulations include the effects of radiative cooling and star formation. We find that equal-mass mergers always lead to the formation of a close SMBH pair at the center of the remnant, with separations limited solely by the adopted force resolution of ~100 pc. Instead, the final SMBH separation in unequal-mass mergers depends sensitively on how the central structure of the merging galaxies is modified by dissipation. In the absence of dissipation, the satellite galaxy can be entirely disrupted before the merger is completed, leaving its SMBH wandering at a distance too far from the center of the remnant for the formation of a close pair. In contrast, gas cooling facilitates the pairing process by increasing the resilience of the companion galaxy to tidal disruption. Moreover, we demonstrate that merging disk galaxies constructed to obey the MBH-σ relation move relative to it depending on whether they undergo a dissipational or collisionless merger, regardless of the mass ratio of the merging systems. Collisionless simulations reveal that remnants tend to move away from the mean relation, highlighting the role of gas-poor mergers as a possible source of scatter. In dissipational mergers, the interplay between strong gas inflows associated with the formation of massive nuclear disks and the consumption of gas by star formation provides the necessary fuel to the SMBHs and allows the merger remnants to satisfy the relation
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