Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Hamburg/SAO Survey for Emission--Line Galaxies. IV. The Fourth List
  of 119 Galaxies   We present the fourth list with results of the Hamburg/SAO Survey for
Emission-Line Galaxies (HSS hereafter, SAO - Special Astrophysical Observatory,
Russia). The list is a result of the follow-up spectroscopy conducted with the
6m SAO RAS telescope in 1998, 1999 and 2000. The data of this snap-shot
spectroscopy survey confirmed 127 emission-line objects out of 176 observed
candidates and allowed their quantitative spectral classification. We could
classify 76 emission-line objects as BCG/HII galaxies or probable BCGs, 8 - as
QSOs, 2 - as Seyfert galaxies, 2 - as super-associations in a subluminous
spiral and an irregular galaxy, and 37 as low-excitation objects - either
starburst nuclei (SBN), or dwarf amorphous nuclei starburst galaxies (DANS). We
could not classify 2 ELGs. Furthermore, for 5 galaxies we did not detect any
significant emission lines. For 91 emission-line galaxies, the redshifts and/or
line intensities are determined for the first time. Of the remaining 28
previously known ELGs we give either improved data on the line intensities or
some independent measurements. The candidates were taken from three different
samples selected by different criteria. Among our first priority candidates we
achieved a detection rate of emission-line objects (ELGs + QSOs) of 68%, among
which 51% are BCGs. Observations of a random selected sample among our second
priority candidates showed that only ~10% are BCGs. We found that the confirmed
BCGs have usually a blue colour ((B-R) < 1.0) and a non-stellar appearance in
the APM database. Our third sample is comprised of second priority candidates
fulfilling these criteria derived from the APM. Follow-up spectroscopy of a
small subsample indicates that the expected detection rate for BCGs is ~40%.

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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: cond-mat