An Atlas of Extragalactic Radio Sources [chapter]

J. P. Leahy, A. H. Bridle, R. G. Strom
1996 Extragalactic Radio Sources  
Overview Our Atlas of Extragalactic Radio Sources will present high-quality images of the nearer half of "3CRR", the sample defined by Laing, Riley & Longair (1983). This is the best-studied complete sample of extragalactic radio sources. AU 173 members have secure redshift s and most have been imaged in the radio at high resolution. There is also copious information on their optical line emission, and many have been detected in the sub-mm, FIR, and in X-rays. 3CRR is widely used as a baseline
more » ... gainst which fainter, higher-redshift samples can be compared to define the evolution of the population (e.g. Neeser et al. 1995; Law-Green, this conference). At present, modern radio data on 3CRR is partly unpublished and the rest is spread across many papers. The digital images are not easily accessible, which hinders systematic morphological analysis. The Atlas will solve (half) this problem. Many of its images have been contributed by other observers, to whom we are very grateful. The sample is defined as: extragalactic objects with Si78MHz > 10.9 Jy, δ > 10° and b 11 > 10° (these define 3CRR), and ζ < 0.5; we exclude the starburst galaxy 3C 231 (M82), to give 85 members, all DRAGNs. The high-redshift part of 3CRR is excluded mainly because the large majority have been imaged at high resolution by Laing & Owen (unpublished). The sample contains 21 objects with powers below the FR break, and of these only three "fat doubles" lack jets. About a third of the objects above the FR break differ from the "classical" symmetric structure with hotspots at both ends. Twenty-seven of the 59 powerful radio galaxies show jets; another 6 have possible jets. Of these, 12 (possibly 13) have twin jets, 157 R. Ekers et al. (eds.), Extragalactic Radio Sources, 157-158.
doi:10.1007/978-94-009-0295-4_61 fatcat:45oc5z5lc5e75l66jazls67dky