Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.7401r&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #74.01; Bulletin of the American Astronomical Society, Vol. 30, p.1364
Astronomy and Astrophysics
Astronomy
3
Scientific paper
We report preliminary results of ASCA observations of the mature supernova remnant HB21. While ROSAT observations showed the X-ray emission is center-filled, the PSPC spectra could not distinguish whether the emission is from shock-heated plasma or synchrotron radiation. Our ASCA spectra reveal that the emission is primarily thermal, with strong Ne, Si, and S lines and weak Mg and Ar lines. The best-fit thermal model yields a line of sight absorption of N_H ~ 3*E(21) cm(-2) , and a temperature kT ~ 0.6 keV. No emission above 6 keV was detected from HB21. The ASCA image confirms that the X-ray morphology is centrally concentrated and the emission smoothly filled within the well-defined radio shell. The center-filled X-ray and shell-like radio morphology, and thermal X-ray spectrum, show that HB21 belongs to the newly-classified ``mixed-morphology supernova remnants'' (Rho & Petre 1998, ApJL, 503, 167). The fact that this remnant is known to be interacting with a molecular cloud is a common characteristic of mixed-morphology supernova remnants, suggesting that HB 21 also evolved in a dense interstellar medium.
Decourchelle Anne
Petre Rob
Rho Jeonghee
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