Evidence Against the Unification of Quasars and Radio Galaxies from a New Sample of Luminous Radio Sources

Details Evidence Against the Unification of Quasars and Radio Galaxies from a New Sample of Luminous Radio Sources Evidence Against the Unification of Quasars and Radio Galaxies from a New Sample of Luminous Radio Sources

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714222b&link_type=abstract

American Astronomical Society, AAS Meeting #217, #142.22; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

A new sample of high-luminosity extragalactic (0.1 < z < 0.5) radio sources has been constructed using SDSS and three radio surveys: WENSS, NVSS, and FIRST. Initial matching of SDSS with WENSS (325 MHz), including the possibility of sources without radio cores, ensures that the sample is not contaminated by anisotropic radio core emission. This technique finds many more sources than existing catalogs based on SDSS matches with FIRST or NVSS. The resulting list comprises 86 objects in a complete sample having log luminosity density > 26.5 W/Hz at 325 MHz in the rest frame. An additional 26 objects are found that were targeted by SDSS as matches with FIRST or ROSAT sources. Optical properties (luminosities, spectral classification, emission line strengths) and radio properties (spectral index, source morphology, projected linear size) have been measured and tabulated. The distribution of projected linear sizes is particularly interesting; when divided into subsets with and without broad lines, the objects with broad lines (quasars) tend to have larger projected sizes at 1.4 GHz than those without broad lines (radio galaxies). The medians of the size distributions are 200 kpc for the radio galaxies (52 objects) and 350 kpc for the quasars (34 objects). This is different from the classic test by Barthel (1989) from which he argued that radio-loud quasars could be unified with radio galaxies by orientation.

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