Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Star cluster versus field star formation in the nucleus of the prototype
  starburst galaxy M82   We analyse high-resolution Hubble Space Telescope/Advanced Camera for Surveys
imaging of the nuclear starburst region of M82, obtained as part of the Hubble
Heritage mosaic made of this galaxy, in four filters (Johnson-Cousins
equivalent B, V, and I broad bands, and an Halpha narrow-band filter), as well
as subsequently acquired U-band images. We find a complex system of ~150 star
clusters in the inner few 100 pc of the galaxy. We do not find any conclusive
evidence of a cluster-formation epoch associated with the most recent starburst
event, believed to have occurred about 4-6 Myr ago. This apparent evidence of
decoupling between cluster and field-star formation is consistent with the view
that star cluster formation requires special conditions. However, we strongly
caution, and provide compelling evidence, that the `standard' simple stellar
population analysis method we have used significantly underestimates the true
uncertainties in the derived ages due to stochasticity in the stellar initial
mass function and the corresponding sampling effects.

17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int