Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218l..89o&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 218, Dec. 15, 1977, p. L89-L92.
Astronomy and Astrophysics
Astrophysics
13
Emission Spectra, Quasars, Stellar Spectrophotometry, Astronomical Observatories, Red Shift, Stellar Magnitude, Vidicons
Scientific paper
Results are reported for observations with an SIT vidicon system of 19 quasar candidates identified in a survey performed with a transmission-grating/prism combination and a 4-m telescope. The data presented include the wavelengths of the observed emission lines, redshifts, the observed magnitude in the continuum at a wavelength corresponding to 1475 A in the rest frame, the emitted flux in the continuum for a cosmology with a zero deceleration factor and a Hubble constant of 50 km/s per Mpc, as well as measures of the intensities and equivalent widths of the (Ly-alpha + N V) and C IV emission lines. Previous redshift and magnitude estimates are shown to compare well with the observed values for 13 candidates with confirmed redshifts, and the surface-density - magnitude relation is examined for magnitudes of 17 to 21 and redshifts of 1.9 to 3.25. The results of the 4-m survey and a previous survey of faint quasars are compared. These two surveys are found to suggest a slope for the luminosity function of 0.9 dex per magnitude for quasars with redshifts of 2 to 2.5. The importance of the luminosity function at a redshift of 2 is briefly discussed.
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