Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Optical Multicolor System For Measuring Galaxy Redshifts And Spectral
  Types   A method of obtaining approximate redshifts and spectral types of galaxies
using a photometric system of six broad-bandpass filters is developed. The
technique utilizes a smallest maximum difference approach rather than a
least-squares approach, and does not consider a galaxy's apparent magnitude in
the determination of its redshift. In an evalution of its accuracy using two
distinct galaxy samples, the photometric redshifts are found to have a root
mean square deviation of $\pm$0.05 from spectroscopically determined redshifts.
Possible systematic errors of the method are investigated, including the
effects of post-starburst (``E+A'') galaxies and attempts to measure redshifts
with incomplete color information. Applications of the technique are discussed.

15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
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The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol