The faint radio source population at 15.7 GHz - IV. The dominance of core emission in faint radio galaxies

被引:4
|
作者
Whittam, I. H. [1 ,2 ]
Green, D. A. [3 ]
Jarvis, M. J. [1 ,2 ]
Riley, J. M. [3 ]
机构
[1] Univ Western Cape, Dept Phys & Astron, Robert Sobukwe Rd, ZA-7535 Bellville, South Africa
[2] Univ Oxford, Dept Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England
[3] Cavendish Lab, Astrophys Grp, 19 JJ Thomson Ave, Cambridge CB3 0HE, England
关键词
catalogues; surveys; galaxies: active; radio continuum: galaxies; ACTIVE GALACTIC NUCLEI; LOCKMAN HOLE; HIGH-FREQUENCY; SOURCE CATALOG; HOST GALAXY; SKY; SIMULATION; DICHOTOMY; ACCRETION; SWIRE;
D O I
10.1093/mnras/staa306
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present 15-GHz Karl G. Jansky Very Large Array observations of a complete sample of radio galaxies selected at 15.7 GHz from the Tenth Cambridge (10C) survey. 67 out of the 95 sources (71 per cent) are unresolved in the new observations and lower frequency radio observations, placing an upper limit on their angular size of similar to 2 arcsec. Thus, compact radio galaxies, or radio galaxies with very faint jets, are the dominant population in the 10C survey. This provides support for the suggestion in our previous work that low-luminosity (L < 10(25) W Hz(-1)) radio galaxies are core dominated, although higher resolution observations are required to confirm this directly. The 10C sample of compact, high-frequency selected radio galaxies is a mixture of high-excitation and low-excitation radio galaxies and displays a range of radio spectral shapes, demonstrating that they are a mixed population of objects.
引用
收藏
页码:2841 / 2853
页数:13
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