Ultrasoft X-rays from the southern galactic hemisphere

Details Ultrasoft X-rays from the southern galactic hemisphere Ultrasoft X-rays from the southern galactic hemisphere

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...211..215l&link_type=abstract

Astrophysical Journal, vol. 211, Jan. 1, 1977, pt. 1, p. 215-222.

Astronomy and Astrophysics

Astronomy

25

Background Radiation, Galactic Radiation, Milky Way Galaxy, X Ray Sources, Astronomical Models, Rocket-Borne Instruments, X Ray Astronomy

Scientific paper

Results are reported for sounding-rocket measurements of the X-ray background at ultrasoft energies (90 to 280 eV) in selected regions of the southern galactic hemisphere. The spectrum of the background is found to be extremely soft, being characterized by a kinetic temperature of less than 100 eV in thermal models. A lower limit of about 0.2 per cu pc is set on the space density of stellar sources in a discrete-source model for the background. The results show that the observed background radiation in the southern galactic hemisphere is about 50% less intense than that sampled at corresponding northern latitudes, the intensity at energies less than 150 eV varies along the scan path and is strongest south of -60 deg, there is no evidence for the existence of any ultrasoft pointlike sources, and the background is probably diffuse in origin. A temperature of about 600,000 K and an electron density of the order of 0.007 per cu cm are derived from a simple model where the radiation originates in a hot interstellar plasma interspersed with cold gas along the line of sight.

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