The environments of FRII radio sources

被引:81
作者
Hardcastle, MJ [1 ]
Worrall, DM [1 ]
机构
[1] Univ Bristol, Dept Phys, Bristol BS8 1TL, Avon, England
关键词
galaxies : active; galaxies : clusters : general; X-rays : galaxies;
D O I
10.1046/j.1365-8711.2000.03883.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Using ROSAT observations, we estimate gas pressures in the X-ray-emitting medium surrounding 63 FRII radio galaxies and quasars. We compare these pressures with the internal pressures of the radio-emitting plasma estimated by assuming minimum energy or equipartition. In the majority of cases (including 12/13 sources with modelled, spatially resolved X-ray emission) radio sources appear to be underpressured with respect to the external medium, suggesting that simple minimum-energy arguments underestimate the internal energy density of the sources. We discuss possible departures from the minimum-energy condition and the consequences of our result for models of the dynamics of radio galaxies, in particular self-similar models.
引用
收藏
页码:562 / 572
页数:11
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