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  Tidal disruptions in circumbinary discs (I): Star formation, dynamics, and binary evolution

Amaro-Seoane, P., Brem, P., & Cuadra, J. (2013). Tidal disruptions in circumbinary discs (I): Star formation, dynamics, and binary evolution. Astrophysical Journal, 764(1): 14. doi:10.1088/0004-637X/764/1/14.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-EAE1-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1985-9
Genre: Journal Article

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1212.2633 (Preprint), 6MB
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 Creators:
Amaro-Seoane, Pau1, Author              
Brem, Patrick, Author
Cuadra, Jorge, Author
Affiliations:
1Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:24013              

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Free keywords: Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO, Astrophysics, Galaxy Astrophysics, astro-ph.GA,General Relativity and Quantum Cosmology, gr-qc
 Abstract: In our current interpretation of the hierarchical structure of the universe it is well established that galaxies collide and merge with each other during their lifetime. If massive black holes (MBHs) reside in galactic centres, we expect them to form binaries in galactic nuclei surrounded by a circumbinary disc. If cooling is efficient enough, the gas in the disc will clump and trigger stellar formation in situ. In this first paper we address the evolution of the binary under the influence of the newly formed stars, which form individually and also clustered. We use SPH techniques to evolve the gas in the circumbinary disc and to study the phase of star formation. When the amount of gas in the disc is negligible, we further evolve the system with a high-accurate direct-summation $N-$body code to follow the evolution of the stars, the innermost binary and tidal disruption events (TDEs). For this, we modify the direct N-body code to (i) include treatment of TDEs and to (ii) include "gas cloud particles" that mimic the gas, so that the stellar clusters do not disolve when we follow their infall on to the MBHs. We find that the amount of stars disrupted by either infalling stellar clusters or individual stars is as large as 10^{-4}/yr per binary, higher than expected for typical galaxies.

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 Dates: 2012-12-1120132013
 Publication Status: Published in print
 Pages: ApJ accepted for publication. Visit this URL for a movie http://members.aei.mpg.de/amaro-seoane/fragmenting-discs
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 Identifiers: arXiv: 1212.2633
DOI: 10.1088/0004-637X/764/1/14
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Title: Astrophysical Journal
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 764 (1) Sequence Number: 14 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/954922828215_2