# The Distance Measurements of Supernova Remnants in The Fourth Galactic Quadrant

## TL;DR

This study uses red clump stars to accurately determine distances to nine supernova remnants in the fourth Galactic quadrant, improving measurement precision and clarifying associations with pulsars.

## Contribution

It introduces a method leveraging red clump stars to measure SNR distances with reduced uncertainties, enhancing previous estimates.

## Key findings

- Distances for 9 SNRs are precisely determined.
- Uncertainties range from 10% to 30%.
- G284.3-1.8 is unlikely associated with PSR J1016-5857.

## Abstract

We take advantage of the red clump stars to build the relation of the optical extinction (AV) and distance in each direction of supernova remnants (SNRs) with known extinction in the fourth Galactic quadrant. The distances of 9 SNRs are well determined by this method. Their uncertainties range from 10% to 30%, which is significantly improved for 8 SNRs, G279.0+1.1, G284.3-1.8, G296.1-0.5, G299.2-2.9, G308.4-1.4, G309.2-0.6, G309.8- 2.6, G332.4-0.4. In addition, SNR G284.3-1.8 with the new distance of 5.5 kpc is not likely associated with the PSR J1016-5857 at 3 kpc.