Computer Science
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992agni.book.....c&link_type=abstract
Active galactic nuclei. IUE-ULDA Access Guide Vol. 4A and B. International Ultraviolet Explorer - Uniform Low Dispersion Archive
Computer Science
1
Scientific paper
The authors present an overview of the spectra of all active galactic nuclei, from narrow line emission line galaxies to quasars and BL Lac objects observed with IUE. This issue illustrates the sample of such objects presently included in the IUE Archive and the variability characteristics of the objects. They have also collected information on the data obtained of these objects with the various X-ray satellites which have operated in conjunction with the IUE Science Observing program. Due to the large amount of work involved in such compilation and the dynamic nature of the ULDA, it is not possible to make both the existing version of the ULDA, and the auxiliary information cover exactly the same period. It was judged to be preferably to collect all information available at the time of preparation, rather than artificially make the time periods covered in the ULDA Guides and the current version of the ULDA coincide. In Vol. 4A and 4B the auxiliary information is included for all data in ULDA version 3.0, extending to January 1st, 1990.
Courvoisier Thierry J. -L.
Paltani Stephane
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