Soft X-ray Emission from the Vela Supernova Remnant

[摘要] A soft X-ray observation of the Vela Supernova Remnant isdescribed. X-ray surface brightness maps of the Remnant are presentedin three energy intervals, 0.15 - 0.5 keV, 0.5 - 1.0 keV, and1.0 - 2.0 keV, and in two different spatial resolutions, 1° x 1°,and 40' x 40'. The maps show a vague shell structure, with two prominentemission regions and a third of somewhat less intensity. Anew method for producing these maps is described. Spectral resultsare presented for the entire nebula and for the two prominent subregions.The spectra are found to be represented by the model ofX-ray emission from a low density, high temperature plasma withabundances given by Allen (1973). Line emission, radiative recombination,and thermal bremsstrahlung are included. Narrow band measurementswith a filter system reveal that the emission from O VIII isdeficient by at least a factor of three; a possible explanation of thisis considered. A search for X-ray pulsations from the Vela pulsar isdescribed, and upper limits are given for any X-ray pulsations at theperiod observed for the radio pulsar.

[发布机构] University:California Institute of Technology;Department:Physics, Mathematics and Astronomy

[关键词] Physics