X-ray-emitting atmospheres of B2 radio galaxies

被引:71
作者
Worrall, DM [1 ]
Birkinshaw, M
机构
[1] Univ Bristol, Dept Phys, Bristol BS8 1TL, Avon, England
[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
关键词
galaxies : active; radiation mechanisms : nonthermal; radio continuum : galaxies; X-rays : galaxies;
D O I
10.1086/308411
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report ROSAT PSPC spatial and spectral analyses of the eight B2 radio galaxies NGC 315, NGC 326, 4C 35.03, B2 0326+39, NGC 2484, B2 1040+31, B2 1855+37, and 3C 449, expected to be representative of the class of low-power radio galaxies. Multiple X-ray components are present in each, and the gas components have a wide range of linear sizes and follow an extrapolation of the cluster X-ray luminosity/temperature correlation, implying that there is no relationship between the presence of a radio galaxy and the gas fraction of the environment. No large-scale cooling flows are found. There is no correlation of radio-galaxy size with the scale or density of the X-ray atmosphere. This suggests that processes on scales smaller than those of the overall gaseous environments are the major influence on radio-source dynamics. The intergalactic medium is usually sufficient to confine the outer parts of the radio structures, in some cases even to within 5 kpc of the core. In the case of NGC 315, an extrapolation suggests that the pressure of the atmosphere may match the minimum pressure in the radio source over a factor of similar to 40 in linear size (a factor of similar to 1600 in pressure).
引用
收藏
页码:719 / 732
页数:14
相关论文
共 34 条
[1]   The LX-T relation and intracluster gas fractions of X-ray clusters [J].
Arnaud, M ;
Evrard, AE .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1999, 305 (03) :631-640
[2]  
BAARS JWM, 1977, ASTRON ASTROPHYS, V61, P99
[3]  
BOHRINGER H, 1993, MON NOT R ASTRON SOC, V264, pL25
[4]   STRUCTURE AND POLARIZATION OF JETS IN THE GIANT RADIO GALAXY NGC-315 [J].
BRIDLE, AH ;
DAVIS, MM ;
FOMALONT, EB ;
WILLIS, AG ;
STROM, RG .
ASTROPHYSICAL JOURNAL, 1979, 228 (01) :L9-L14
[5]  
BRIDLE AH, 1991, ASTRON ASTROPHYS, V245, P371
[6]  
BRIKINSHAW M, 1993, APJ, V412, P568
[7]   X-ray observations of low-power radio galaxies from the B2 catalogue [J].
Canosa, CM ;
Worrall, DM ;
Hardcastle, MJ ;
Birkinshaw, M .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1999, 310 (01) :30-38
[8]  
COLLA G, 1975, ASTRON ASTROPHYS, V38, P209
[9]  
DERUITER HR, 1986, ASTRON ASTROPHYS SUP, V65, P111
[10]  
EKERS RD, 1981, ASTRON ASTROPHYS, V101, P194