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Session 78 - Supernova Remnants.
Display session, Wednesday, January 17
North Banquet Hall, Convention Center

[78.04] Revisiting the Supernova Remnant Distribution in the Galaxy

G. Case, D. Bhattacharya (UC Riverside)

Technological advances in radio telescopes and X-ray instruments over the last 20 years have increased the number of known supernova remnants (SNRs) by more than one-third and led to a better determination of SNR properties. In particular, more SNRs now have reasonably determined distances. However, many of these distances were determined kinematically using old rotation curves (based on R_\sun = 10 kpc and V_\sun = 250 km/s). We use a more recent rotation curve (based on R_\sun = 8.5 kpc and V_\sun = 220 km/s) and verify or recalculate the distances to 30 SNRs and use these SNRs to derive a new surface brightness-to-diameter (\Sigma-D) relation. A revised Galactic distribution of SNRs is presented based on the new distances calculated from this \Sigma-D relation. The z-dependence of the \Sigma-D relation is examined. A new method is employed to compensate for observational selection effects by computing scale factors based on individual telescope survey sensitivities, angular resolutions and sky coverage. The radial distribution of SNRs, corrected for selection effects, is presented and compared to previous works.

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