Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105.1070w&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 691, p. 1070-1074.
Astronomy and Astrophysics
Astronomy
Background Radiation, Intergalactic Media, Interstellar Matter, Rosat Mission, X Ray Sources, Autocorrelation, Milky Way Galaxy, Spatial Resolution
Scientific paper
Images from the ROSAT X-ray observatory have been used to probe the origin of the soft X-ray background below a discrete source detection limit S(0.5-2 keV) about 1 x 10 exp -14 erg/sq s/sq cm. By analyzing the energy-dependent autocorrelation function of the background in two ROSAT deep-pointing observations, we have statistically measured the spectrum of pointlike sources that are still embedded in the background. With this source spectrum, we have then decomposed the background into a pointlike source contribution characterized by a power law and a diffuse contribution represented by a two-temperature plasma. In addition to the soft thermal component that arises primarily in the 10 exp 6 K gas of the Local Bubble, a hard diffuse thermal component is present in the background spectrum, characterizing an important phase of the interstellar or intergalactic medium of a temperature 2-3 x 10 exp 6 K.
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