next previous
Up: The B3-VLA quasar

5. Comments on individual sources

In this section some comments are collected for sources having peculiar or not well defined features in their spectra as well as details on a few objects whose identification changed from the original radio source identification.

0028+450: Our spectrum shows MgI (5175 Å) and NaI (5892 Å) at rest, thus we have classified this object as a star (see Table 6 (click here)). However the identification is uncertain because Thomson et al. (1992) report the presence of one emission line which they identify as [OIII] (4983 Å at rest), thus classifying the object as a NELRG at z = 0.365.

0143+446b: The original identification was 14 magnitude red stellar object. In a CCD we discovered a fainter object about 4 arcsec south which revealed to be the true identification, i.e. a quasar with tex2html_wrap_inline1580 (see Table 4 (click here)).

0219+443: The spectrum only shows MgII, indicating a redshift of 0.852, in good agreement with Djorgovski et al. (1990) who find 0.850 from a spectrum with five lines (see Table 5 (click here)).

0226+467: Only one broad line at about 6200 Å is present in our spectrum. We do not give the value of the redshift because of the poor Signal to Noise Ratio of the spectrum. If we identify the line as an MgII the redshift is tex2html_wrap_inline1586 (see Table 5 (click here)).

0255+460: As mentioned earlier, our wavelength calibration has some uncertainties in the blue region of the spectrum. The feature at about 4240 was identified as CIII, confirming the MgII at 6185 Å. The redshift reported in Table 5 (click here) is based on MgII only.

0724+396: The identification was with a galaxy of 16.5 mag which revealed to be a star. The Quasar is 5''SW and closer to radio centroid (see Table 4 (click here)).

0809+404: We report spectral data for this object, though it was not included in the 172 quasar candidates sample. The original ID was G?, but it had stellar appearance on the CCD image. The spectrum classified it as Emission line Galaxy.

0912+392: The optical counterpart has been found 1.5 m fainter during the March 1990 observing run with respect to POSS-I.

0953+398: A broad line at about 4300 Å has been identified as CIII, confirming that a line at 6099 Å is MgII. The redshift derived from the CIII is not reported and the final value has been computed using MgII only (see Table 5 (click here)).

1128+385: A line at about 4350 Å has been identified as CIV, confirming the feature at 5221 Å being CIII. The redshift relative to CIV is not reported because of problems with wavelength calibration at the blue end of the spectrum. The redshift is computed using CIII only (see Table 5 (click here)).

1241+411: We report spectral data for this object, though it was not included in the 172 quasar candidates sample. The original ID was G?, but it had stellar appearance on the CCD image. The spectrum classified it as Emission line galaxy.

1416+400: A feature at about 4150 Å has been identified with MgII but we didn't use it for the redshift calculation because of problems with wavelength calibration in that region of the spectrum. The other lines present in the spectrum give anyway a good z measurement (see Table 5 (click here)).

2316+398: The line at 7835 Å, identified as MgII, has a poor definition and it was not possible to obtain a secure value of the central wavelength, so we decided not to use it for the redshift determination. Thus the redshift has been computed using CIV only.

2322+396: The spectrum appears featureless but this may be due to the bad S/N ratio (see Table 5 (click here) and Table 6 (click here)), thus the identification is uncertain.

2329+398: The spectrum shows only one emission line at about 5010 Å and wide enough to say that this is a Quasar. Since it was not possible to give a certain identification, the redshift is not reported.


next previous
Up: The B3-VLA quasar

Copyright by the European Southern Observatory (ESO)
web@ed-phys.fr