An X-ray luminosity analysis for FRIs and FRIIs  

作　　者：ZHANG ChunLing FAN JunHui 

机构地区：[1]Center for Astrophysics,Guangzhou University,Guangzhou 510006,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2009年第9期1434-1441,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：Supported by the National Natural Science Foundation of China (Grant Nos. 10573005 and 10633010);the National Basic Research Program of China (Grant No. 2007CB815405)

摘　　要：Radio galaxies are divided into two groups according to their luminosities at 178 MHz, namely Fa- naroff-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 logLX1 keV = 41.30±2.51 erg·s-1·keV-1 is found for FRIs, which is lower than that for FRIIs, logLX1 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.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 X 1 keV = 41.30±2.51 erg·s?1·keV?1 is found for FRIs, which is lower than that for FRIIs, logL X 1 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.

关 键 词：ACTIVE GALACTIC NUCLEI RADIO GALAXIES RELATIVISTIC beaming 

分 类 号：P172.2[天文地球—天文学]