Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Star Formation History and Stellar Assembly of High Redshift
  Galaxies   I discuss current observational constraints on the star-formation and
stellar-assembly histories of galaxies at high redshifts. The data on massive
galaxies at z<1 implies that their stellar populations formed at z>2, and that
their morphological configuration was in place soon thereafter. Spitzer Space
Telescope 24 micron observations indicate that a substantial fraction of
massive galaxies at z ~ 1.5-3 have high IR luminosities, suggesting they are
rapidly forming stars, accreting material onto supermassive black holes, or
both. I compare how observations of these IR-active phases in the histories of
massive galaxies constrain current galaxy-formation models.

33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph