Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981stin...8220097w&link_type=abstract
Unknown
Astronomy and Astrophysics
Astrophysics
Absorption Spectra, Astronomical Models, Compton Effect, Emission Spectra, Galactic Radiation, Galactic Structure, Heao 2, X Ray Sources, Astrophysics, Bremsstrahlung, Gamma Rays, Hydrogen, Intergalactic Media, Luminosity, Mathematical Models, Radiant Flux Density, Synchrotron Radiation
Scientific paper
The HEAO A2 experiment data was systematically searched for unresolved galactic disc emission. Although there were suggestions of non-uniformities in the emission, the data were consistent with a disc of half-thickness 241 + 22 pc and surface emissivity (2-10 keV) at galactic radius R(kpc) of 2.2 10 to the minus 7th power exp(-R/3.5) erg/sq cm to the (-2)power/s (R 7.8 kpc). giving a luminosity of approximately 4.4 10 to the 37th power erg S to the (-1) power. If the model is extrapolated to radii less than 7.8 kpc, the unresolved disc emission is approximately 1.4 10 to the 38th power erg S to the (-1) power (2-10 keV) i.e., a few percent of the luminosity of the galaxy in resolved sources. the disc emission has a spectrum which is significantly softer than that of the high galactic latitude diffuse X-ray background and it is most probably of discrete source origin.
Boldt Elihu A.
Marshall Francis E.
Swank Jean H.
Worrall Diana Mary
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