The radio properties of the cD galaxy of Abell 2390

被引:14
作者
Augusto, P
Edge, AC
Chandler, CJ
机构
[1] Univ Porto, Ctr Astrofis, P-4150 Oporto, Portugal
[2] Univ Madeira, Ctr Ciencias Matemat, P-9050 Funchal, Portugal
[3] Univ Durham, Dept Phys, Durham DH1 3LE, England
[4] Natl Radio Astron Observ, Socorro, NM 87801 USA
关键词
galaxies : active; galaxies : clusters : individual :; Abell; 2390; galaxies : elliptical and lenticular; cD;
D O I
10.1111/j.1365-2966.2005.09965.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present multifrequency, multi-epoch radio imaging of the complex radio source B2151+174 in the core of the cluster, Abell 2390 (z similar or equal to 0.23). From new and literature data, we conclude that the Faranoff-Riley type II (FRII)-powerful radio source is the combination of a compact, core-dominated 'medium-sized symmetric object' (MSO) with a more extended, steeper spectrum mini-halo. B2151+174 is unusual in a number of important aspects. (i) It is one of the most compact and flat spectrum sources in a cluster core known; (ii) it shows a complex, compact twin-jet structure in a north-south orientation; (iii) the orientation of the jets is 45 degrees misaligned with apparent structure (ionization cones and dust disc) of the host galaxy on larger scales. Since the twin-jet of the MSO has its northern half with an apparent 'twist', it might be that precession of the central supermassive black hole explains this misalignment. B2151+174 may be an example of the early stage (10(3)-10(4) yr duration) of a 'bubble' being blown into the intracluster medium where the plasma has yet to expand.
引用
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页码:366 / 374
页数:9
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