Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Star-formation in NGC 4038/4039 from broad- and narrow band photometry:
  Cluster Destruction?   Accurately determining the star formation history in NGC 4038/4039 -- ``The
Antennae'' is hampered by extinction. We therefore used near infrared images
obtained with ISAAC at the VLT and with SOFI at the NTT to determine the recent
star formation history in this merger. In combination with archival HST data,
we determined ages, extinction and other parameters for single star clusters,
and properties of the cluster population as a whole. About 70% of the K_s-band
detected star clusters with masses >= 10^5 M_sun are younger than 10 Myrs
(approximately an e-folding time for cluster ages), which we interpret as
evidence for rapid dissolution but not free expansion. The total mass of K-band
selected clusters is about 5-10x10^8 M_sun and represents about 3-6% of the
total molecular gas. This takes into account only the detected clusters and in
view of the rapid dissolution means that this is only a lower limit to the
total mass of stars produced in clusters during the burst. Studies of cluster
formation in other galaxies recently suggested short cluster dissolution
timescales, too, which means that star formation rates may have been severely
underestimated in the past. Extinction is strongly variable and very high in
some regions, but around A_V=1.3 mag on average. Even though most clusters are
detected at least in I-band, only the information about individual cluster ages
and extinction allows to avoid uncertainties of orders of magnitude in star
formation rate estimates determined from optical fluxes. From the distribution
of individual cluster extinction vs. age, which is significantly higher for
clusters below 8-9 Myr than for older clusters, we infer that this is the time
by which a typical cluster blows free of its native dust cocoon.

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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
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The categories of this paper are: math
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: cond-mat
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The categories of this paper are: funct-an