Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectral Analysis of the Stromlo-APM Survey II. Galaxy luminosity
  function and clustering by spectral type   We study the luminosity function and clustering properties of subsamples of
local galaxies selected from the Stromlo-APM survey by the rest-frame
equivalent widths of their Halpha and Oii emission lines. The b_J luminosity
function of star-forming galaxies has a significantly steeper faint-end slope
than that for quiescent galaxies: the majority of sub-L* galaxies are currently
undergoing significant star formation. Emission line galaxies are less strongly
clustered, both amongst themselves, and with the general galaxy population,
than quiescent galaxies. Thus as well as being less luminous, star-forming
galaxies also inhabit lower-density regions of the Universe than quiescent
galaxies.

9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg