Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A close look at the Centaurus A group of galaxies III. Recent star
  formation histories of late-type dwarfs around M83   We study the resolved stellar populations of dwarf galaxies in the nearby
Centaurus A/M83 group of galaxies. Our goal is to characterize their
evolutionary history and to investigate eventual similarities or differences
with the dwarf population in other group environments. This work presents the
analysis of five late-type (irregular) dwarfs found in the vicinity of the
giant spiral M83. Using archival HST/ACS data, we perform synthetic
color-magnitude diagram modeling to derive the star formation histories of
these late-type dwarfs. The target objects show heterogeneous star formation
histories, with average star formation rates of 0.08 to 0.70x10^{-2} M_odot/yr.
Some of them present prolonged, global bursts of star formation (~300-500 Myr).
The studied galaxies are all metal-poor ([Fe/H] ~-1.4). We further investigate
the spatial extent of different stellar populations, finding that the young
stars show a clumpy distribution, as opposed to the smooth, broad extent of the
old ones. The actively star forming regions have sizes of ~100 pc and lifetimes
of >~100 Myr, thus suggesting a stochastic star formation mode for the target
dwarf irregular galaxies. The galaxies formed ~20% to 70% of their stars more
than ~7 Gyr ago. The studied dwarfs have average star formation rates slightly
higher than their analogues in the Local Group, but comparable to those in the
M81 group. Our preliminary sample indicates that the neutral gas content of the
target dwarfs does seem to be affected by the group environment: galaxies
within a denser region have a much lower M_HI/<SFR> than the isolated ones,
meaning that they will exhaust their gas reservoir more quickly.

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The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
9
The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: supr-con