DISCOVERY OF 35 NEW SUPERNOVA REMNANTS IN THE INNER GALAXY

摘要

We report the discovery of up to 35 new supernova remnants (SNRs) from a 42″ resolution, 90 cm multi-configuration Very Large Array survey of the Galactic plane covering 4.5° < l < 22.0° and |b| < 1.25°. Archival 20 cm, 11 cm, and 8 μm data have also been used to identify the SNRs and constrain their properties. The 90 cm image is sensitive to SNRs with diameters 2.5′ to 50′ and down to a surface brightness limit of ～10~(-21) W m~(-2) Hz~(-1) sr~(-1). This survey has nearly tripled the number of SNRs known in this part of the Galaxy and represents an overall 15% increase in the total number of Galactic SNRs. These results suggest that further deep, low-frequency surveys of the inner Galaxy will resolve the discrepancy between the expected number of Galactic SNRs and the significantly smaller number of currently known SNRs.