ROSAT Observations of the Composite Supernova Remnant G326.3-1.8
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
We have observed X-ray emission from the radio-defined composite shell plus filled-center plerion Galactic supernova remnant SNR 0326.3 - 1.8 with the ROSAT position sensitive proportional counter PSPC. The derived distance falls within the range of a variety of previous but poor and uncertain distance estimates and is consistent with the only reliable lower limit of D 1.5 kpc. Evidence exists in the literature from both optical and radio studies that would place the SNR significantly further than this lower limit. Higher quality radio absorption measurements are warranted to confirm our distance determination. This result, along with other recent ROSAT studies of SNRs, implies that improved distance estimates may be established for the large number of extended shell-type SNRs with very poor distance estimates which fall within ROSATs all-sky survey. No X-ray analog to the plerionic radio emission appears on our ROSAT image, but our exposure is not sufficient to establish a stringent limit on any filled-center nonthermal X-ray emission.