Updated radio Σ - D relation for galactic supernova remnants - II

Abstract

In this paper we present the updated empirical radio surface- brightness-to-diameter (Σ-D) relation for Galactic supernova remnants (SNRs) calibrated using 110 SNRs with reliable distances. We apply orthogonal fitting procedure and kernel density smoothing in the Σ ¡ D plane and compare the results with the latest theoretical Σ - D relations derived from simulations of radio evolution of SNRs. We argue that the best agreement between the empirical and simulated Σ ¡ D relations is achieved if the mixed-morphology SNRs and SNRs of both, low brightness and small diameter, are filtered out from the calibration sample. The distances to 5 newly discovered remnants and 27 new candidates for shell SNRs are estimated from our full and filtered calibration samples. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. 176005: Emission nebulae: structure and evolution]

Keywords

• methods: data analysis
• methods: statistical
• astronomical databases: miscellaneous
• ism: supernova remnants
• radio continuum: ism