The Jet Power and Emission Line Correlations of Radio Loud Optically Selected Quasars

Details The Jet Power and Emission Line Correlations of Radio Loud Optically Selected Quasars The Jet Power and Emission Line Correlations of Radio Loud Optically Selected Quasars

2011-05-08

arxiv.org/abs/1105.1543v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

To appear in ApJ Letters

Scientific paper

In this Letter, the properties of the extended radio emission form SDSS DR7 quasars with $0.4$ 20 - 30 kpc). The frequency of quasars with FR II level extended radio emission is $\approx 2.3%$ and $>0.4%$ of quasars have FR I level extended radio emission. The lower limit simply reflects the flux density limit of the survey. The distribution of the long term time averaged jet powers of these quasars, $\bar{Q}$, has a broad peak $\sim 3\times 10^{44}$ ergs/sec that turns over below below $10^{44}$ ergs/sec and sources above $10^{45}$ ergs/sec are extremely rare. It is found that the correlation between the bolometric (total thermal) luminosity of the accretion flow, $L_{bol}$, and $\bar{Q}$ is not strong. The correlation of $\bar{Q}$ with narrow line luminosity is stronger than the correlation with broad line luminosity and the continuum luminosity. It is therefore concluded that previous interpretations of correlations of $\bar{Q}$ with narrow line strengths in radio galaxies as a direct correlation of jet power and accretion power have been overstated. It is explained why this interpretation mistakenly overlooks the sizeable fraction of sources with weak accretion luminosity and powerful jets discovered by Ogle et al (2006).

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