Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dwarf Elliptical Galaxies: Structure, Star Formation, and
  Color-Magnitude Diagrams   The aim of this paper is to cast light on the formation and evolution of
elliptical galaxies by means of N-body/hydro-dynamical simulations that include
star formation, feed-back and chemical evolution. Particular attention is paid
to the case of dwarf spheroidals of the Local Group which, thanks to their
proximity and modern ground-based and space instrumentation, can be resolved
into single stars so that independent determinations of their age and star
formation history can be derived. Dwarf galaxies are known to exhibit
complicated histories of star formation ranging from a single very old episode
to a series of bursts over most of the Hubble time. We start from virialized
haloes of dark matter, and follow the infall of gas into the potential wells
and the formation of stars. We find that in objects of the same total mass,
different star formation histories are possible, if the collapse phase started
at different initial densities. We predict the final structure of dwarf
spheroidal galaxies, their kinematics, their large scale distribution of gas
and stars, and their detailed histories of the star formation and metal
enrichment. Using a population synthesis technique, star formation and metal
enrichment rates are then adopted to generate the present color-magnitude
diagrams of the stellar populations hosted by dwarf spheroidal galaxies.
varying the cosmological parameters $H_0$ and $q_0$. compared with the
observational ones for some dwarf spheroidals of the Local Group.

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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: physics
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The categories of this paper are: cs
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys