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Conclusions

We conducted follow-up spectroscopy for the second part of candidates from the Hamburg/SAO Survey for ELGs. Summarizing the results presented, the analysis of the content of various types of objects, and the discussion above, we draw the following conclusions:

• The intended methods to detect ELG candidates on the plates of the Hamburg Quasar Survey give a reasonably high detection rate of emission-line objects ($\sim$ 64 %) (134 objects of 209 observed in this second part). Additional selection criteria applied in comparison to the first, pilot part increased the efficiency of follow-up spectroscopy by a factor of about two.

• Besides of ELGs we found also 6 new quasars, all with Ly$\alpha$ in the wavelength region 5000-5300 Å (i.e with 2.9 < z < 3.35) near the red boundary of the IIIa-J photoplates.

• The high fraction of BCG/H II galaxies among all newly discovered ELGs (about 84 %) is in line with our main goal -- to pick up a deep BCG sample in the sky region under analysis.