Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984xue..conf..118b&link_type=abstract
In its X-ray and UV Emission from Active Galactic Nuclei p 118-120 (SEE N85-17790 08-88)
Astronomy and Astrophysics
Astronomy
Emission Spectra, Quasars, X Ray Spectra, Astronomical Models, Balloon-Borne Instruments, Electron Energy, Heao
Scientific paper
The balloon telescope High Energy X-ray Experiment was used to search for a break in the spectrum of 3C 273, because as a nearby quasar it is a strong source of X-rays and the HEAO-1 spacecraft observed a rather hard spectrum. Results show that the absolute intensity is higher (factor 1.5 in 18 to 30 keV) than expected. The spectrum is very flat (index -1.20 + or -0.17). There is no high energy break up to at least 200 keV. Under the assumption of a thermal model, there is an obvious correlation between the intensity and the electron temperature. Compared to HEAO-A4 data luminosity increases by a factor of 3. The absolute luminosity in the 20 to 200 keV range is 1.2 times 10 to the 47th power erg/sec.
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