Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223..537p&link_type=abstract
Astrophysical Journal, Part 1, vol. 223, July 15, 1978, p. 537-543.
Astronomy and Astrophysics
Astronomy
11
Luminous Intensity, Pulsars, Satellite Observation, X Ray Sources, X Ray Spectra, Astronomical Models, High Temperature, Nebulae, Oso-8, Spaceborne Astronomy
Scientific paper
Results are presented for a study of the X-ray emission from a small portion of the galactic plane near galactic longitude 260 deg. This region contains at least six low-luminosity X-ray sources within about 10 deg of PSR 0833-45, which is near the center of the Gum nebula. The X-ray source 4U 0833-45, associated with the Vela pulsar, is observed at twice its 4U catalog intensity. The lack of X-ray pulsations at the pulsar period (greater than 99% nonpulsed), the nonthermal power-law spectrum, and models of the X-ray source distribution in this region suggest that a large fraction of the X-rays come from an extended source about 1 deg of arc in radius. The observation of a high-temperature (effective temperature at least 100 million K) spectrum in a field of view containing only Puppis A among known sources has led to the discovery of new OSO 8 source, OS 0752-39. Other spectra from this region are discussed.
Becker Robert H.
Boldt Elihu A.
Holt Stephen S.
Pravdo Steven Howard
Serlemitsos Peter J.
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