ADC/CDS Standard Document for Catalog:
/external/radio/E8006/

E/VIII/6   Double Radio source Associated with Galactic Nucleus  (Leahy+ 1998)
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Double Radio source Associated with Galactic Nucleus (DRAGN) 
   Leahy J.P., Bridle A.H., Strom R.G.  
   <Nuffield Radio Astronomy Laboratories (NRAL) at Jodrell Bank (1998)>    
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ADC_Keywords: Atlases; Radio sources; Active gal. nuclei; Clusters, galaxy;
              External catalog

Location: http://www.jb.man.ac.uk/atlas/index.html

Description:
   We present radio images and other data for the nearest 85 DRAGNs (radio 
   galaxies and related objects) in the so-called "3CRR" sample of Laing, 
   Riley & Longair (1983).

   The Main Page for each DRAGN gives a JPEG display of the full-resolution 
   image, a table giving the details of that image, comments on each object 
   (mostly not written yet!), and a table of the basic properties of the DRAGN
   and its host galaxy or quasar, which is a subset of the data from the Radio
   and Optical tables. The "supplementary" high-resolution images are mentioned
   in the comments on the main pages, and can be accessed via the "Other 
   images" link on the navigation bar. 
   
   The JPEG images are designed to bring out clearly the main structural 
   features of each DRAGN. This often involves the use of a highly non-linear 
   translation between the original radio intensity and the displayed 
   pseudo-colour. We have chosen the transfer function in each case to give 
   the least misleading representation consistent with seeing all the 
   interesting structure in the image. For quantitative work there is no 
   substitute for looking at the original FITS images. 

   The JPEGs are usually at full scale, i.e. one JPEG pixel per FITS pixel. To
   speed up transfer time, we have shrunk some of them to keep the file sizes 
   to less than about 10 kbytes. These can be recognised by their thick red 
   borders. Full-scale versions of these can be accessed by clicking on the 
   reduced-scale images. 

   In many images, the position of the active nucleus is fairly obvious from 
   a central radio core. Where it is not, we have plotted a cross marking the 
   position of the optical identification. 
   
   There is a separate Data Page listing all the data for each DRAGN, excluding
   the derived parameters such as Power and Linear size. As well as reproducing
   the data in the tables, we give more extensive information on the radio, 
   infrared and optical flux densities, and complete bibliographic references. 
   
   NOTE: The data in these tables is still being compiled, and at present some
   of this material has not been double-checked. While we are confident that 
   the vast majority has been correctly entered, we are equally certain that 
   a number of typographical errors remain; however, we do list the original 
   sources of all the data quoted. 

   The C20 image for each object, and any supplementary images (including 
   images of cores) are shown on the "Other images" page, along with a table 
   for each image giving details. 

References:
   Laing R.A., Riley J.M., Longair M.S. 1983. Bright radio sources at 178 
   MHz: Flux densities, optical identifications and the cosmological evolution
   of powerful radio galaxies. Mon. Not. R. Astr. Soc., 204, 151-187. 
   =1983MNRAS.204..151L
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(End)                         Gail L. Schneider [SSDOO/ADC]      31-Aug-1998