SIMBAD references

2003A&A...399..469H - Astronomy and Astrophysics, volume 399, 469-487 (2003/2-4)

The Parkes quarter-Jansky flat-spectrum sample. 2. New optical spectra and redshift measurements.

HOOK I.M., SHAVER P.A., JACKSON C.A., WALL J.V. and KELLERMANN K.I.

Abstract (from CDS):

We present optical spectra and redshift measurements for 178 flat-spectrum objects from the Parkes quarter-Jansky flat-spectrum sample. These spectra were obtained in order to compile a complete sample of quasars for use in a study of quasar evolution. We present a composite optical spectrum made from the subset of 109 quasars that have flux densities in the range 0.25Jy<S2.7GHz<0.5Jy, and make a comparison with a composite for radio-quiet QSOs from the Large Bright Quasar Survey. Our large sample of radio-loud quasars allows us to strengthen previous reports that the Lyα and CIV emission lines have larger equivalent width in radio-loud quasars than radio-quiet QSOs to greater than the 3σ level. However we see no significant difference in the equivalent widths of CIII] or MgII. We also show that the flux decrements across the Lyman-α line (DA) measured from these spectra show the same trend with redshift as for optically selected QSOs.

Abstract Copyright:

Journal keyword(s): quasars: general

VizieR on-line data: <Available at CDS (J/A+A/399/469): tablea1.dat notes.dat>

Simbad objects: 178

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2019.09.19-21:44:49

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