At the bottom of each page is a menu bar containing a series of links. The slightly mysterious pair labelled "<<<<" and ">>>>" or "Prev." and "Next", just take you to the previous or next page in the sequence.
This is divided into two main sections: the Introductory Material is for interested laypeople and undergraduates, and fills in some of the background which professionals will take for granted. The Description of the Atlas gives a complete technical description, primarily aimed at professionals; but for other readers we give links from the more technical terms to the glossary.
While the Atlas is being put together there are also "What's New" and "Status" pages.
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 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 (see the note on displaying radio images). As discussed in the description of the Look-up table, 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.
The Main pages can be accessed via the alphanumeric and icon listing page. They can also be paged through by using the "Prev." and "Next" links at the bottom of each page, and from the "Main Page" link at the bottom of each Data Page and Other image page (see below). The internal order is of Right Ascension, which is nearly alphanumeric order except for objects with non-3C names. They can also be accessed individually via the search form on the Home page or on the Search page.
These pages can be accessed via the "Other images" link on the Main and Data Pages, and it is also possible to page through them using the "Prev." and "Next" buttons at the bottom of each page. They can be reached directly via the Search page.
The Data Pages can be accessed from the "Data Page" link on each Main Page and Other images page, from each other in sequence, and from the Search page.
Please read the note about data reliability.
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