Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Massive Star Cluster Populations in Irregulars as Probable Younger
  Counterparts of Old Metal-Rich Globular Cluster Populations in Spheroids   Peak metallicities of metal-rich(MR) populations of GCs belonging to
spheroids of different mass fall within the somewhat conservative
-0.7<=[Fe/H]<=-0.3 range. Indeed, if possible age effects are taken into
account,this metallicity range might become smaller. Irregulars, like the LMC,
with longer timescales of their formation and lower star formation (SF)
efficiency do not contain the old MRGCs with [Fe/H]>-1.0,but they are observed
to form populations of young/ intermediate-age massive star clusters (MSCs)
with masses exceeding 10^4 Msol. Their formation is widely believed to be
accidental process fully depending on external factors. From analysis of data
available on the populations and their hosts, including populous star clusters
in the LMC, we find that their most probable mean metallicities fall within
-0.7<=[Fe/H]<=-0.3, as the peak metallicities of MRGCs do, irrespective of
sings of interaction. Moreover, both the disk giant metallicity distribution
function (MDF) in the LMC and the MDFs for old giants in the halos of massive
spheroids exhibit significant increasing toward [Fe/H]~-0.5. That is in
agreement with a correlation found between SF activity in galaxies and their
metallicity. The formation of both the old MRGCs in spheroids and MSC
populations in irregulars probably occurs approximately at the same stage of
the host galaxies' chemical evolution and is related to the essentially
increased SF activity in the hosts around the same metallicity that is achieved
very soon in massive spheroids, later in lower-mass spheroids, and much more
later in irregulars. (Abridged)

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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: cs