An X-ray luminosity analysis for FRIs and FRIIs |
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Authors: | ChunLing Zhang and JunHui Fan |
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Institution: | (1) Center for Astrophysics, Guangzhou University, Guangzhou, 510006, China |
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Abstract: | Radio galaxies are divided into two groups according to their luminosities at 178 MHz, namely Fanaroff-Riley type Is (FRIs)
and Fanaroff-Riley type IIs (FRIIs) with FRIs showing lower radio luminosities than FRIIs. In this paper, the X-ray data are
compiled for 183 radio galaxies (61 FRIs and 122 FRIIs), from the available literature, for the analysis of the X-ray properties.
The 1 keV X-ray luminosities are calculated and discussed for the two groups, and an averaged X-ray luminosity of logL
X1 keV = 41.30±2.51 erg·s−1·keV−1 is found for FRIs, which is lower than that for FRIIs, logL
X1 keV = 43.39±3.06 erg·s−1·keV−1. A Kolmogorov-Smirnov (K-S) test indicates that the probability for the X-ray luminosity distributions of the two groups
to be from the same parent distribution is 1.44×10−10. We also discuss the origin and the mechanism of the X-ray emission for FRIs and FRIIs.
Supported by the National Natural Science Foundation of China (Grant Nos. 10573005 and 10633010) and the National Basic Research
Program of China (Grant No. 2007CB815405) |
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Keywords: | active galactic nuclei radio galaxies relativistic beaming |
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