Correlations of Quasar Optical Spectra with Radio Morphology

Details Correlations of Quasar Optical Spectra with Radio Morphology Correlations of Quasar Optical Spectra with Radio Morphology

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21721207k&link_type=abstract

American Astronomical Society, AAS Meeting #217, #212.07; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

Using a large sample of radio quasars with high-quality optical spectra, we have investigated statistical relationships between some important radio and optical properties of quasars. Our sample consists of 4714 radio quasars from FIRST and SDSS, classified by eye into several radio morphology classes, including classical triples, doubles, and unresolved sources. We examine optical colors of these subsamples and find that radio quasars unresolved by FIRST have a redder color distribution than radio-quiet quasars; other classes of radio quasars have color distributions similar to the radio-quiet quasars. We use two supposed statistical indicators of quasar orientation, the radio core-to-lobe ratio (R) and the core radio-to-optical ratio (RI), to explore correlations of several optical spectral line parameters with orientation, and as a function of radio morphology. It appears that RI is a better orientation indicator than R. An important result of this study is that optical line equivalent widths (EWs) tend to increase with both R and RI, suggesting that, in contrast to commonly accepted orientation-based theories, quasar EWs increase as the line-of-sight angle to the radio-jet axis decreases.
This material is based upon work supported under a National Science Foundation Graduate Research Fellowship, and by NSF grant AST-0507259 to the University of Washington. D.P.S. acknowledges support from NSF grant AST-0607634.

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