The radio properties of type II quasars

TL;DR

This study investigates the radio properties of type II quasars, revealing a detection rate similar to other AGN samples and suggesting that not all sources are genuine AGNs based on radio luminosity correlations.

Contribution

First radio observations of a sample of type II quasars, providing insights into their radio detection rate and properties within the unified model framework.

Findings

Radio detection rate of 61% consistent with other AGN samples

No correlation between radio and [O III] luminosities

Spectral index distribution similar to 3C sources

Abstract

Quasars (of type I) are the luminous analogs of type I Seyfert galaxies. Within the framework of unified models of active galaxies, the population of quasars of type II recently discovered with the Sloan Digital Sky Survey are the luminous analogs of type II Seyfert galaxies. Since our knowledge and understanding of the radio properties of these type II quasars are very limited, we have performed Very Large Array observations for a sub-sample of such sources. Our detection rate of 61% is consistent with the detection rate for other AGN samples. We do not find a correlation between radio and [O III] $\lambda$5007 luminosities for these sources. Although the distribution of spectral indices is similar to that of the 3C sources, the lack of dependence of radio luminosity on [O III] $\lambda$5007 luminosity suggests that not all sources in the sample are genuine AGNs.