ASCA observations of Cassiopeia A

Details ASCA observations of Cassiopeia A ASCA observations of Cassiopeia A

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46l.151h&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 4, p. L151-L155

Astronomy and Astrophysics

Astronomy

78

Cassiopeia A, Doppler Effect, Emission Spectra, Shock Spectra, Supernova Remnants, X Ray Astronomy, X Ray Spectra, Charge Coupled Devices, Image Processing, Imaging Spectrometers, Potassium, Satellite-Borne Instruments, Silicon, X Ray Telescopes

Scientific paper

The ASCA Observatory provides the first capability to map a diffuse X-ray source in individually resolved emission lines. We have applied this capability to the Cas A supernova remnant, measuring the mean energies and equivalent widths of 14 line features in three distinct spatial regions. The northwest (NW) and southeast (SE) regions provide the large fraction of the X-ray emission at energies below 4 keV, and define the axis of a Doppler map of the remnant constructed by measuring the peak energy of the prominent Si-K feature. Using restoration techniques to obtain image quality equivalent to 30 sec full width at half maximum (FWHM), we present restored images in the two brightest line features, and in two continuum bands. An emission region in the west is increasingly prominent at higher energies, and its markedly lower metallicity and correlation with radio emission suggest that its X-ray emission has a larger component from fore-shocked material than do the NW and SE regions where the emission is presumed to be dominated by reverse-shocked material.

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