Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An HST Survey of the Disk Cluster Population of M31. II. ACS Pointings   This paper reports on a survey of star clusters in M31 based on archival
images from the Hubble Space Telescope. Paper I (Krienke and Hodge 2007)
reported results from images obtained with the Wide Field/Planetary Camera 2
(WFPC2) and this paper reports results from the Advanced Camera for Surveys
(ACS). The ACS survey has yielded a total of 339 star clusters. The color-
integrated magnitude diagram of clusters shows three significant features: (1)
a group of very red, luminous objects: the globular clusters, (2) a wide range
in color for the fainter clusters, representing a considerable range in age and
reddening, and (3) a maximum density of intermediate-age, intermediate-mass
clusters with ages close to 500 million years and masses of about 2000 solar
masses. We give a brief qualitative interpretation of the distribution of
clusters in the CMDs in terms of their formation and destruction rates.

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The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
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The categories of this paper are: eess
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph