Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Near-Infrared Observations of Globular Clusters in NGC 4472, NGC 4594,
  NGC 3585 and NGC 5813 and Implications for their Ages and Metallicities   We present near-infrared photometry of the globular cluster systems of the
early-type galaxies NGC 4472, NGC 4594, NGC 3585, and NGC 5813. We combine
these near-infrared data, obtained with PANIC at the Magellan Baade 6.5m
telescope, with archival optical HST and FORS/VLT data, and use the optical to
near-infrared colors to constrain the ages and metallicities of the globular
clusters around the target galaxies. For NGC 4472 we have the most extensive
near-infrared and optical photometric dataset. These colors show that the NGC
4472 globular cluster system has a broad metallicity distribution and that the
clusters are predominantly old (i.e. ages of about 10 Gyr or more). This result
agrees well with earlier spectroscopic work on NGC 4472, and is evidence that
the combination of optical to near-infrared colors can identify predominantly
old systems and distinguish these from systems with a substantial intermediate
age component. Based on the smaller sample of combined optical and
near-infrared data NGC 4594 and NGC 3585 appear to have predominantly old
globular cluster systems, while that of NGC 5813 may have a more significant
age spread. We also match our sample of globular clusters with near-infrared
and optical photometry to Chandra X-ray source detections in these galaxies,
and discuss how the probability that a globular cluster hosts a low-mass X-ray
binary depends on metallicity and age.

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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: cs