Other
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.3909r&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #39.09; Bulletin of the American Astronomical Society, Vol. 24, p.791
Other
Scientific paper
We report the results of a preliminary analysis of an 8,000 sec observation of the supernova remnant W44 using the ROSAT PSPC. The image shows the same centrally peaked morphology observed by the Einstein IPC (Smith et al., 1985, MNRAS, 217,99) and contrasts with the shell-like radio morphology. The spectral analysis of the central part of W44, combining EXOSAT ME and Einstein SSS, shows that a two-temperature Raymond model is preferred over a single-temperature Raymond model. This implies that the shocked plasma has not yet reached ionization equilibrium. The column density for this central region is 1.64+/- 0.10times 10(22) cm(-2) and the temperatures are 0.5+/- 0.05keV and >4keV. These numbers are consistent with those derived from the central ROSAT data. Assuming the two-temperature Raymond model is appropriate for the rest of the remnant, the variation of temperature and the column density was obtained region by region using the PSPC and Einstein IPC. The ratio map between the IPC(0.4-4keV) and PSPC (0.1-2.2keV) images shows two peaks near the remnant center and another near a northern peak of the ROSAT intensity map. This indicates that the center and the northern peak area have either high temperature or high absorption, consistent with the results from the spectral analysis. Also four H alpha and [S II] images of W44 are taken using the Palomar 60" wide field telescope with 1.2 arcsec resolution. The mosaiced images reveal the presence of optical filaments in the northwestern and southeastern portion of the remnant, within the X-ray emitting region. The X-ray image shows locally brighter emission and clumps along the filaments, suggesting both are produced by the interaction between the supernova shock front and regions of enhanced ambient density.
Hester Jeff J.
Petre Rob
Rho Joon H.
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