Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multi-seeded multi-mode formation of embedded clusters in the RMC:
  Clusters baked in swept-up shells   This is the first of a series of three papers on clustered star formation in
the Rosette Molecular Complex. Here we investigate star formation in the
interfacing layers between the expanding Rosette Nebula and its surrounding
cloud, based on an analysis of the spatially complete and unbiased 2MASS data.
Two medium-mass infrared clusters with ages of around 1 Myr are identified in
the south and south-east arcs of the fragmented shell. The majority of the
candidate cluster members in these radiation and pressure-confined regions are
found to be almost uniformly distributed, roughly following the compression
layers traced by the distribution of optical depth at 100 $\mu$m, and may well
develop into gravitationally unbound systems upon their emergence from the
parental cloud. These expanding shells are believed to be playing important
roles in impeding the emerging young open cluster NGC 2244 from intruding
immediately and deeply into the ambient molecular cloud, where sequential
formation of massive clusters is taking place.

34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph