Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of young protoclusters embedded in dense massive clumps. A new
  grid of population synthesis SED models and a new set of L/M evolutionary
  tracks   A grid of 20 millions 3-1100$\mu$m SED models is presented for synthetic
young clusters embedded in dense clumps. The models depend on four primary
parameters: the clump mass M$_{clump}$ and dust temperature T$_{dust}$, the
fraction of mass f$_{core}$ locked in dense cores, and the age of the clump
t$_{SF}$. We populate the YSO clusters using the IMF from Kroupa(2001) and the
YSOs SED models grid of Robitaille et al. (2006). We conduct extensive testing
of SED fitting using a simulated dataset and we find that M$_{clump}$
essentially depends on the submillimeter portion of the SED, while T$_{dust}$
is mostly determined from the shape of the SED in the 70-350$\mu$m range.
Thanks to the large number of models computed we verify that the combined
analysis of L/M, [8-24] and [24-70] colours removes much of the SEDs
f$_{core}$-t$_{SF}$ degeneracy. The L/M values are particularly useful to
diagnose f$_{core}$. L/M$\leq$1 identifies protoclusters with f$_{core}\leq$0.1
and t$_{SF} \leq 10^5$ years, while L/M$\geq$10 excludes f$_{core}\leq$0.1. We
characterize lower limits of L/M where ZAMS stars are not found in models, and
we also find models with L/M $\geq$10 and no ZAMS stars, in which
[8-24]$\geq0.8\pm 0.1$ independently from M$_{clump}$, temperature and
luminosity. This is the first set of synthesis SED models suited to model for
embedded and unresolved clusters of YSOs. A set of new evolutionary tracks in
the L/M diagram is also presented.

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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph