Computer Science
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..200c&link_type=abstract
Testing the AGN paradigm. AIP Conference Proceedings, Volume 254, pp. 200-203 (1992).
Computer Science
X-Ray
Scientific paper
In the course of selecting ultrasoft X-ray-emitting objects from the data base of the Einstein Observatory, we have found a class of active galactic nuclei with clearly distinguishable soft X-ray components below 0.5 keV. The spectrum or the soft emission corresponds to that of a ~10 eV blackbody. These AGN have necessarily been detected through equivalent hydrogen columns densities that are less than a few times 1020 cm-2. At least three kinds of AGN comprise this sample: (1) low redshift quasars and Seyfert galaxies that have only ultrasoft emission: these AGN lack detectable hard X-ray emission; (2) AGN that have both ultrasoft as well as hard X-ray components; for some of these objects multiple observations exist which show that the components may be independently variable; and (3) high redshift quasars whose soft X-ray emission may originate, as in the case of the lensed quasar 0957+561, in an extended source, or in a source that is luminosity-enhanced due to relativistic beaming. This report represents a summary of the results of the analysis of the X-ray data on the AGN discovered in the Ultrasoft Survey (USS). The complete results along with a detailed source list, may be found in Córdova et al. (1991) and Puchnarewicz et al. (1991). See Puchanrewicz and Mason, in these proceedings, for the optical properties of the USS AGN.
Cordova France A.
Thompson Richard Jule Jr.
No associations
LandOfFree
Towards a complete sample of ultrasoft X-ray emitting AGN does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Towards a complete sample of ultrasoft X-ray emitting AGN, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Towards a complete sample of ultrasoft X-ray emitting AGN will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1513588