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GRAVITATIONAL FRAGMENTATION IN GALAXY MERGERS: A STABILITY CRITERION

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2013-01-04
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Escala, Andrés
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GRAVITATIONAL FRAGMENTATION IN GALAXY MERGERS: A STABILITY CRITERION
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  • Escala, Andrés;
  • Becerra, Fernando;
  • Valle, Luciano del;
  • Castillo, Esteban;
Abstract
We study the gravitational stability of gaseous streams in the complex environment of a galaxy merger, because mergers are known to be places of ongoing massive cluster formation and bursts of star formation. We find an analytic stability parameter for the case of gaseous streams orbiting around the merger remnant. We test our stability criterion using hydrodynamic simulations of galaxy mergers and obtain satisfactory results. We find that our criterion successfully predicts the streams that will be gravitationally unstable to fragmentation into clumps.
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URI: https://repositorio.uchile.cl/handle/2250/125800
DOI: doi:10.1088/0004-637X/763/1/39
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The Astrophysical Journal, 763:39 (7pp), 2013 January 20
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