Exploration of the Radio-Loud/Radio Quiet Dichotomy for QSO: Using Radio Morphology and 4D Eigenvector 1

Details Exploration of the Radio-Loud/Radio Quiet Dichotomy for QSO: Using Radio Morphology and 4D Eigenvector 1 Exploration of the Radio-Loud/Radio Quiet Dichotomy for QSO: Using Radio Morphology and 4D Eigenvector 1

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4514z&link_type=abstract

American Astronomical Society, AAS Meeting #211, #45.14; Bulletin of the American Astronomical Society, Vol. 39, p.798

Astronomy and Astrophysics

Astronomy

Scientific paper

The reality of a RL/RQ Dichotomy for QSO remains an open problem. Recent studies not only provide us with contradictory results, but also display the confusion of comparing conclusions drawn on the basis of different views on "what means radio-loud"? We propose a definition of radio loudness based on three criteria (simultaneously applied): radio morphology, radio luminosity and radio-optical flux density ratio. Fanaroff-Riley II radio sources (FRIIs) are assumed to be the parent population of RL quasars, while the core dominated RL quasars are assumed to be preferentially aligned FRIIs. Orientation-unification then suggests the RQ-RL boundary is set by the least radio luminous FRII and by the lowest radio-optical ratio for an FRII. We also consider RL and RQ quasars in the context of a 4D Eigenvector 1 (4DE1) Parameter Space that is defined independently of any radio measure.
Using Sloan Digital Sky Survey (SDSS) spectroscopic data for 400+ QSO (z<0.7 and brighter than psf g =17.5), coupled with FIRST and NVSS radio surveys (1.4GHz), we show that classical RL sources distribute very differently from the RQ majority of QSO.

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