Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979stin...7929136b&link_type=abstract
Presented at HEAO Symp., Huntsville, Ala., 8 May 1979
Astronomy and Astrophysics
Astronomy
Extragalactic Radio Sources, Heao 1, Spectroscopy, X Ray Spectra, Active Galaxies, Extraterrestrial Radiation, Galaxies, Graphs (Charts), Maps, Sky Surveys (Astronomy), X Ray Sources
Scientific paper
The all-sky surveys made with the A-2 instrument aboard HEAO-1 involved spectroscopy over a broad enough band width, with sufficient resolution, to obtain the basic spectral characteristics for two extreme aspects of the extragalactic X-ray sky. The overall spectrum (above 3 KeV) is remarkably well decribed by a thermal model. At the other extreme, the detailed broad-band observations of individual sources are restricted to objects within the present epoch. The objects include several individual active galaxies studied in detail for the first time as well as clusters of galaxies. Relating these results to the vast spatially unresolved hard X-ray flux measured with this instruments as well as the softer X-rays (at less than 3 keV) spatially resolved to high redshifts with the Einstein Observatory remains a challenge.
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