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We conducted follow-up spectroscopy for a pilot sample of the Hamburg/SAO
Survey for emission-line galaxies.
The spectroscopy resulted in the detection or/and quantitative spectral
classification of 74 emission-line objects. Of them 55 are newly discovered,
and 19 are already known in the literature. For 8 of the latter the redshifts
are determined at first time, and for most of the rest emission line ratios
are presented at first time.
Summarizing the presented description of the selection procedure,
the follow-up spectroscopy results and their discussion we conclude:
- The methods used for the selection of ELG candidates on objective
prism plates give a sufficiently high fraction of BCGs in the resulting
lists of detected ELGs (47 galaxies or 63 %), in accordance with
the original aim of the Hamburg/SAO survey project.
- Besides of BCGs we found also 4 new quasars and 23 ELGs of other types.
- The overall detection efficiency of emission-line objects for
the pilot sample is rather low (about 31 %) and should be improved.
The performed analysis of the data allowed to formulate additional
selection criteria.
- The estimated lower limit of the mean surface number density of BCGs is
about 0.21/square degree, similar to that for the BCG samples from
the SBS and from the ELG sample in the direction of voids.
- A preliminary comparison of the brightnesses and redshifts of the newly
discovered BCGs with those from the samples in the SBS and Case survey
zones shows that they are quite similar and thus their combination will
create a new homogeneously selected large BCG sample, suitable for
the study of the spatial distribution of BCGs.
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1998-11-24