期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 411, 期 3, 页码 1909-1916出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2010.17820.x
关键词
galaxies: active; galaxies: jets; galaxies: nuclei; quasars: general; infrared: galaxies; radio continuum: galaxies
资金
- Foundation for Science and Technology (FCT-Portugal) [SFRH/BD/30486/2006]
- RCUK
- STFC
- NASA
- Fundação para a Ciência e a Tecnologia [SFRH/BD/30486/2006] Funding Source: FCT
- Science and Technology Facilities Council [ST/G002630/1, ST/G004420/1, ST/H00260X/1] Funding Source: researchfish
- STFC [ST/G004420/1, ST/G002630/1, ST/H00260X/1] Funding Source: UKRI
We use new mid-infrared (mid-IR) photometry from the Spitzer Space Telescope to study the relations between low-frequency radio luminosity density L-nu 151 (MHz), mid-IR (12 mu m rest frame) luminosity nu L-nu 12 (mu m) and optical emission-line ([O II]) luminosity L-[O II], for a complete sample of z similar to 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 nu L-nu 12 (mu m) and L-[O II] is similar to that seen in other active galactic nuclei samples, consistent with both nu L-nu 12 (mu m) and L-[O II] tracing accretion rate. We show that the positive correlation between nu L-nu 12 (mu m) and L-nu 151 (MHz) implies that there is a genuine lack of objects with low values of nu L-nu 12 (mu m) at high values of L-nu 151 (MHz). Given that nu L-nu 12 (mu m) traces accretion rate, while L-nu 151 (MHz) 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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