Deep VLA observations of an optically selected sample of intermediate redshift QSOs and the optical luminosity function of the radio loud QSOs

Details Deep VLA observations of an optically selected sample of intermediate redshift QSOs and the optical luminosity function of the radio loud QSOs Deep VLA observations of an optically selected sample of intermediate redshift QSOs and the optical luminosity function of the radio loud QSOs

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.1548l&link_type=abstract

The Astronomical Journal (ISSN 0004-6256), vol. 108, no. 5, p. 1548-1556

Astronomy and Astrophysics

Astronomy

29

Light (Visible Radiation), Quasars, Radio Astronomy, Radio Spectra, Radio Stars, Red Shift, Stellar Evolution, Stellar Luminosity, Stellar Spectra, Astronomical Spectroscopy, Light Emission, Radio Emission, Very Large Array (Vla)

Scientific paper

We present deep Very Large Array (VLA) observations of a complete sample of 23 optically selected quasi-stellar objects (QSOs) with B less than 19.4 at intermediate redshift (0.8 less than z less than 3.4). The observations were carried out at 5 and 1.4 GHz in the C array configuration. 4 of our 23 QSOs were detected (2 radio loud and 2 radio quiet), confirming the decrease of the radio loud (alpharo greater than 0.19) fraction of QSOs with increasing redshift. Stronger constraints are obtained for the radio luminosity of the radio quiet population at 2 less than z less than 3 with L5 GHz less than 1024.2 W/Hz. Combining our observations with other existing radio data on optically selected samples (a total of 357 QSOs), we derive the evolutionary functional form of the optical luminosity function of the radio loud QSOs in the redshift range 0 less than z less than 2.9. The data are consistent with a radio loud optical luminosity function having lower densities but a similar shape with respect to the total (radio quiet plus radio loud) population, i.e., Phi(L) proportional to Lgamma with -3.5 greater than gamma greater than -4.1 at bright luminosities, and -1.7 greater than gamma greater than -2.4 at faint luminosities. The evolution is slower (2.7 less than k less than 3.1), and the 'break magnitude' is brighter (-24 greater than M*B greater than -25 at z = 0) than in the parent total optical luminosity function. It results that the differential evolution between the radio loud and radio quiet QSOs population could account for the recent claims of a steepening with redshift of the total QSO luminosity function.

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