Radio Quiet-er: The Search for Radio-Silence within CIV Emission Line Parameter Space

Details Radio Quiet-er: The Search for Radio-Silence within CIV Emission Line Parameter Space Radio Quiet-er: The Search for Radio-Silence within CIV Emission Line Parameter Space

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832714k&link_type=abstract

American Astronomical Society, AAS Meeting #218, #327.14; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

Despite the debate as to whether a dichotomy between radio-loud and radio-quiet quasars actually exists, the fact remains that some quasars are radio-loud while others are not. Using median stacking analysis of SDSS quasars undetected by FIRST, we search for possible radio-silence amongst various sub-samples with different broad emission line properties. Specifically, we find that the combination of two parameters of the CIV emission line (the equivalent width and the "blueshift") can be used to determine the ionizing spectrum of individual quasars. Quasars with strong CIV are seen to have hard (ionizing) SEDs, while quasars with large blueshifts are seen to have softer SEDs. The shape of the SED depends on fundamental parameters such as mass, accretion rate, and spin; radio-loudness may be dependent on these parameters. As such, our CIV emission line parameter space affords a unique way to probe the radio properties of quasars. We predict that those radio-quiet quasars with the least ionizing spectra will have very different median stacked peak flux values than radio-quiet quasars with hard ionizing spectra. We further break our sample into smaller subsets (e.g., based on optical luminosity) to explore the radio-dependence on these parameters. Stacking subsets of quasars undetected by FIRST offers fresh new insight to a frustratingly stagnant problem.

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