RADIO-LOUD AGN AND THE EXTRAGALACTIC GAMMA-RAY BACKGROUND

被引:115
作者
PADOVANI, P
GHISELLINI, G
FABIAN, AC
CELOTTI, A
机构
[1] EUROPEAN SO OBSERV,W-8046 GARCHING,GERMANY
[2] OSSERV TORINO,I-10025 PINO TORINESE,ITALY
[3] UNIV CAMBRIDGE,INST ASTRON,CAMBRIDGE CB3 0HA,ENGLAND
关键词
GALAXIES; ACTIVE; BL LACERTAE OBJECTS; GENERAL; DIFFUSE RADIATION; GAMMA-RAYS; OBSERVATIONS; RADIO CONTINUUM;
D O I
10.1093/mnras/260.1.L21
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We estimate the contribution of radio-loud active galactic nuclei to the gamma-ray background using the recent detections by GRO of BL Lacs and flat-spectrum radio quasars at energies > 100 MeV From the recently derived radio luminosity functions of these objects, together with the observed mean values of the gamma-ray to radio luminosity, we derive contributions of about 30 and 35 per cent, respectively, at 100 MeV. The total contribution of radio-loud sources is 66(-24)+31 per cent, leaving little room for a substantial contribution from radio-quiet active galactic nuclei, none of which has been detected so far. Our results assume that the detected sources are typical of the radio-loud population and not strongly variable; further gamma-ray detections and variability studies should allow a refinement of our estimate.
引用
收藏
页码:L21 / L24
页数:4
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