Revised Distances to 21 Supernova Remnants
Abstract
We carry out a comprehensive study of HI 21 cm line observations and CO line observations of 21 supernova remnants (SNRs). The aim of the study is to search for HI absorption features to obtain kinematic distances in a consistent manner. The 21 SNRs are in the region of sky covered by the Very Large Array Galactic Plane Survey (HI 21 cm observations) and Galactic Ring Survey (CO line observations). We obtain revised distances for 10 SNRs based on new evidence in the HI and CO observations. We revise distances for the other 11 SNRs based on an updated rotation curve and new error analysis. The mean change in distance for the 21 SNRs is , i.e. change of 1.5 kpc compared to a mean distance for the sample of 6.4 kpc. This has a significant impact on interpretation of the physical state of these SNRs. For example, using a Sedov model, age and explosion energy scale as the square of distance, and inferred ISM density scales as distance.
Cite
@article{arxiv.1808.09082,
title = {Revised Distances to 21 Supernova Remnants},
author = {S. Ranasinghe and D. A. Leahy},
journal= {arXiv preprint arXiv:1808.09082},
year = {2018}
}
Comments
18 pages, 19 figures