Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Where is Population II?   The use of roman numerals for stellar populations represents a classification
approach to galaxy formation which is now well behind us. Nevertheless, the
concept of a pristine generation of stars, followed by a protogalactic era, and
finally the mainstream stellar population is a plausible starting point for
testing our physical understanding of early star formation. This will be
observationally driven as never before in the coming decade. In this paper, we
search out observational tests of an idealized coeval and homogeneous
distribution of population II stars. We examine the spatial distribution of
quasars, globular clusters, and the integrated free electron density of the
intergalactic medium, in order to test the assumption of homogeneity. Any
$real$ inhomogeneity implies a population II that is not coeval.

29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg