Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Star cluster survival and compressive tides in Antennae-like mergers   Gravitational tides are widely understood to strip and destroy galactic
substructures. In the course of a galaxy merger, however, transient totally
compressive tides may develop and prevent star forming regions from dissolving,
after they condensed to form clusters of stars. We study the statistics of such
compressive modes in an N-body model of the galaxy merger NGC 4038/39 (the
Antennae) and show that ~15% of the disc material undergoes compressive tides
at pericentre. The spatial distribution of observed young clusters in the
overlap and nuclear regions of the Antennae matches surprisingly well the
location of compressive tides obtained from simulation data. Furthermore, the
statistics of time intervals spent by individual particles embedded in a
compressive tide yields a log-normal distribution of characteristic time ~10
Myr, comparable to star cluster formation timescales. We argue that this
generic process is operative in galaxy mergers at all redshifts and possibly
enhances the formation of star clusters. We show with a model calculation that
this process will prevent the dissolution of a star cluster during the
formation phase, even for a star formation efficiency as low as ~10%. The
transient nature of compressive tides implies that clusters may dissolve
rapidly once the tidal field switches to the usual disruptive mode.

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The categories of this paper are: stat
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom