Fernandes, CAC; Jarvis, MJ; Rawlings, S; Martínez-Sansigre, A; Hatziminaoglou, E; Lacy, M; Page, MJ; ... Vardoulaki, E; + view all Fernandes, CAC; Jarvis, MJ; Rawlings, S; Martínez-Sansigre, A; Hatziminaoglou, E; Lacy, M; Page, MJ; Stevens, JA; Vardoulaki, E; - view fewer (2011) Evidence for a maximum jet efficiency for the most powerful radio galaxies. Monthly Notices of the Royal Astronomical Society , 411 (3) 1909 - 1916. 10.1111/j.1365-2966.2010.17820.x.

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Abstract

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.

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