Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Washington CCD Photometry of the Globular Cluster System of the Giant
  Elliptical Galaxy M60 in Virgo   We present a photometric study of the globular clusters in the giant
elliptical galaxy M60 in the Virgo cluster, based on deep, relatively wide
field Washington CT_1 CCD images. The color-magnitude diagram reveals a
significant population of globular clusters in M60, and a large number of young
luminous clusters in NGC 4647, a small companion spiral galaxy north-west of
M60. The color distribution of the globular clusters in M60 is clearly bimodal,
with a blue peak at (C-T_1)=1.37, and a red peak at (C-T_1)=1.87. We derive two
new transformation relations between the (C-T_1)_0 color and [Fe/H] using the
data for the globular clusters in our Galaxy and M49. Using these relations we
derive the metallicity distribution of the globular clusters in M60, which is
also bimodal: a dominant metal-poor component with center at [Fe/H]=-1.2, and a
weaker metal-rich component with center at [Fe/H]=-0.2. The radial number
density profile of the globular clusters is more extended than that of the
stellar halo, and the radial number density profile of the blue globular
clusters is more extended than that of the red globular clusters. The number
density maps of the globular clusters show that the spatial distribution of the
blue globular clusters is roughly circular, while that of the red globular
cluster is elongated similarly to that of the stellar halo. We estimate the
total number of the globular clusters in M60 to be 3600+/-500$,and the specific
frequency to be S_N=3.8+/-0.4. The mean color of the bright blue globular
clusters gets redder as they get brighter in both the inner and outer region of
M60. This blue tilt is seen also in the outer region of M49, the brightest
Virgo galaxy. Implications of these results are discussed.

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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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The categories of this paper are: cmp-lg
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The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin