Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2011-03, Vol.411 (3), p.1909-1916

Ort / Verlag

Oxford, UK: Blackwell Publishing Ltd

Erscheinungsjahr

2011

Link zum Volltext

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• 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.