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Size dependence of the radio-luminosity-mechanical-power correlation in radio galaxies


Shabala, SS and Godfrey, LEH, Size dependence of the radio-luminosity-mechanical-power correlation in radio galaxies, Astrophysical Journal, 769, (2) Article 129. ISSN 0004-637X (2013) [Refereed Article]

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Copyright 2013. The American Astronomical Society.

DOI: doi:10.1088/0004-637X/769/2/129


We examine the relationship between source radio luminosity and kinetic power in active galactic nucleus jets. We show that neglecting various loss processes can introduce a systematic bias in the jet powers inferred from radio luminosities for a sample of radio galaxies. This bias can be corrected for by considering source size as well as radio luminosity; effectively the source size acts as a proxy for source age. Based on a sample of Fanaroff-Riley Type II radio sources with jet powers derived from the measured hotspot parameters, we empirically determine a new expression for jet power that accounts for the source size, (Qjet/1036 W = 1.5+1.8-0.8(L151/1027 W Hz-1)0.8(1 + ɀ)1.0(D/kpc)0.58±0.17, where D is source size and L151 the 151 MHz radio luminosity. By comparing a flux-limited and volume-limited sample, we show that any derived radio-luminosity-jet-power relation depends sensitively on sample properties, in particular the source size distribution and the size-luminosity correlation inherent in the sample. Such bias will affect the accuracy of the kinetic luminosity function derived from lobe radio luminosities and should be treated with caution.

Item Details

Item Type:Refereed Article
Keywords:galaxies: active – galaxies: jets – quasars: general
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Shabala, SS (Associate Professor Stas Shabala)
ID Code:84545
Year Published:2013
Web of Science® Times Cited:29
Deposited By:Mathematics and Physics
Deposited On:2013-05-17
Last Modified:2017-11-03

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