title: X-ray Structure of the Cygnus Loop.
abstract: X-ray emission from the Cygnus Loop was observed in the energy region around 0.2 to 1 kiloelectronvolt with a collector that focused x-rays along one dimension while scanning across the nebula. The total integrated intensity is 1.3x 10(-8) erg per square centimeter per second. The one-dimensional x-ray structure has the same angular size-about 3 degrees-as the outermost boundaries of the optical filaments. There is no increase in x-ray emission at the center of the nebula nor at the strong feature that is seen in certain radio maps. The x-ray spectrum is consistent with thermal radiation from a hot plasma at a temperature of about 4 x 10(6) degrees K with evidence for a line at 19 angstroms corresponding to the 2p-->1s transition of O VIII.
authors.forename: P
authors.initials: P
authors.lastname: Gorenstein
authors.forename: B
authors.initials: B
authors.lastname: Harris
authors.forename: H
authors.initials: H
authors.lastname: Gursky
authors.forename: R
authors.initials: R
authors.lastname: Giacconi
authors.forename: R
authors.initials: R
authors.lastname: Novick
authors.forename: P V
authors.initials: PV
authors.lastname: Bout