Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Dynamical and Chemical Evolution of Dwarf Spheroidal Galaxies   We present a large sample of fully self-consistent hydrodynamical
Nbody/Tree-SPH simulations of isolated dwarf spheroidal galaxies (dSphs). It
has enabled us to identify the key physical parameters and mechanisms at the
origin of the observed variety in the Local Group dSph properties. The initial
total mass (gas + dark matter) of these galaxies is the main driver of their
evolution. Star formation (SF) occurs in series of short bursts. In massive
systems, the very short intervals between the SF peaks mimic a continuous star
formation rate, while less massive systems exhibit well separated SF bursts, as
identified observationally. The delay between the SF events is controlled by
the gas cooling time dependence on galaxy mass. The observed global scaling
relations, luminosity-mass and luminosity-metallicity, are reproduced with low
scatter. We take advantage of the unprecedentedly large sample size and data
homogeneity of the ESO Large Programme DART, and add to it a few independent
studies, to constrain the star formation history of five Milky Way dSphs,
Sextans, LeoII, Carina, Sculptor and Fornax. For the first time, [Mg/Fe] vs
[Fe/H] diagrams derived from high-resolution spectroscopy of hundreds of
individual stars are confronted with model predictions. We find that the
diversity in dSph properties may well result from intrinsic evolution. We note,
however, that the presence of gas in the final state of our simulations, of the
order of what is observed in dwarf irregulars, calls for removal by external
processes.

1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th