X-ray emission from young supernova remnants: nonionization equilibrium abundances and emissivities

Journal Article · Mon Nov 01 04:00:00 EST 1982 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/160422· OSTI ID:6518826

Shull, J M

X-ray line emission from hot, low-density plasma in young supernova remnants is strongly enhanced by departures from ionization equilibrium. We have calculated the X-ray emission from a Sedov blast wave, a nonequilibrium evolutionary treatment of the ionization structure, and have fitted the resulting spectrum to HEAO 2 SSS data for Tycho's remnant. These models yield dramatically different elemental abundances for heavy elements (Ne, Mg, Si, S, Ar, Ca, and Fe), compared with two-temperature component equilibrium models of Becker et al. Nonequilibrium broad-band X-ray emissivities result in lower mass determinations for the supernova ejecta. Areas of further improvement of remnant X-ray modeling are suggested.

• Research Organization: Joint Institute for Laboratory Astrophysics, University of Colorado and National Bureau of Standards
• OSTI ID: 6518826
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 262:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
CHEMICAL COMPOSITION
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
ELECTROMAGNETIC RADIATION
EMISSION
FLUID MECHANICS
HYDRODYNAMICS
IONIZATION
IONIZING RADIATIONS
MECHANICS
NEBULAE
PLASMA
RADIATIONS
SHOCK WAVES
SPECTRA
SUPERNOVA REMNANTS
X RADIATION
X-RAY SPECTRA