Journal Article

Evidence for a maximum jet efficiency for the most powerful radio galaxies

C. A. C. Fernandes, M. J. Jarvis, S. Rawlings, A. Martínez-Sansigre, E. Hatziminaoglou, M. Lacy, M. J. Page, J. A. Stevens and E. Vardoulaki

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 3, pages 1909-1916
Published in print March 2011 | ISSN: 0035-8711
Published online February 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17820.x
Evidence for a maximum jet efficiency for the most powerful radio galaxies

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We use new mid-infrared (mid-IR) photometry from the Spitzer Space Telescope to study the relations between low-frequency radio luminosity density , mid-IR (12 μm rest frame) luminosity and optical emission-line ([O ii]) luminosity L]O ii], for a complete sample of z∼ 1 radio galaxies from the 3CRR, 6CE, 6C*, 7CRS and TOOT00 surveys. The narrow redshift span of our sample (0.9 < z < 1.1) means that it is unbiased to evolutionary effects. We find evidence that these three quantities are positively correlated. The scaling between and L[O ii] is similar to that seen in other active galactic nuclei samples, consistent with both and L[O ii] tracing accretion rate. We show that the positive correlation between and implies that there is a genuine lack of objects with low values of at high values of . Given that traces accretion rate, while traces jet power, this can be understood in terms of a minimum accretion rate being necessary to produce a given jet power. This implies that there is a maximum efficiency with which accreted energy can be chanelled into jet power and this efficiency is of the order of unity.

Keywords: galaxies: active; galaxies: jets; galaxies: nuclei; quasars: general; infrared: galaxies; radio continuum: galaxies

Journal Article.  6050 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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