Gravitational Fragmentation in Galaxy Mergers: A Stability Criteria
Andres Escala, Fernando Becerra, Luciano del Valle, Esteban, Castillo
TL;DR
This paper develops an analytic stability criterion for gaseous streams in galaxy mergers, validated by hydrodynamical simulations, to predict where gravitational fragmentation and star formation are likely to occur.
Contribution
The paper introduces a new analytic stability parameter specifically for gaseous streams in galaxy mergers, validated through simulations.
Findings
The stability criterion accurately predicts gravitationally unstable streams.
Simulations confirm the criterion's effectiveness in identifying fragmentation sites.
The study enhances understanding of star formation triggers in galaxy mergers.
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 case of gaseous streams orbiting around the merger remnant. We test our stability criteria using hydrodynamical simulations of galaxy mergers, obtaining satisfactory results. We find that our criteria successfully predicts the streams that will be gravitationally unstable to fragment into clumps.
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