Distances, Radial Distribution and Total Number of Galactic Supernova Remnants

S. Ranasinghe and D. Leahy

Submitted on 9 September 2022


We present a table of 215 SNRs with distances. %estimate New distances are found to SNR G51.26+0.11 of 6.6±1.7 kpc using HI absorption spectra%Additionally, and to 5 other SNRs using maser/molecular cloud associations. We recalculate the distances and errors to all SNRs using a consistent rotation curve and provide errors where they were not previously estimated. This results in a significant distance revisions for 20 SNRs. Because of observational constraints and selection effects, there %seems to be is an apparent deficit of observed number of Galactic supernova remnants (SNRs). To investigate this, we employ two methods. The first method applies correction factors for the selection effects to derive the radial density distribution. The second method compares functional forms for the SNR surface density and selection function against the data to find which functions are consistent with the data. The total number of SNRs in the Galaxy is 3500 (Method 1) or in the range 2400 to 5600 (Method 2). We conclude that the current observed number of SNRs is not yet complete enough to give a well-determined total SNR number or radial density function.


Comment: 24 pages, 8 figures

Subjects: Astrophysics - High Energy Astrophysical Phenomena; Astrophysics - Astrophysics of Galaxies