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.
- Publication:
-
Serbian Astronomical Journal
- Pub Date:
- December 2019
- DOI:
- 10.2298/SAJ1999023V
- arXiv:
- arXiv:1912.06379
- Bibcode:
- 2019SerAJ.199...23S
- Keywords:
-
- methods: data analysis;
- methods: statistical;
- astronomical data bases: miscellaneous;
- ISM: supernova remnants;
- radio continuum: ISM;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 20 pages, 2 figures, 4 tables