The revised distance of supernova remnant G15.4+0.1

TL;DR

This study refines the distance estimate to supernova remnant G15.4+0.1 using HI and 13CO spectra, impacting understanding of its associated pulsar wind nebula and TeV source.

Contribution

The paper provides a revised distance measurement for G15.4+0.1 based on spectral analysis, improving previous estimates and clarifying its physical parameters.

Findings

Distance constrained between 8.0 and 10.5 kpc.

Supports association with TeV source HESS J1818-154.

Refines parameters of the pulsar wind nebula.

Abstract

We measure the distance to the supernova remnant G15.4+0.1 which is likely associated with TeV source HESS J1818-154. We build the neutral hydrogen (HI) absorption and 13CO spectra to supernova remnant G15.4+0.1 by employing the data from the Southern Galactic Plane Survey (SGPS) and the HI/OH/Recombination line survey (THOR). The maximum absorption velocity of about 140 km/s constrains its lower limit distance of about 8.0 kpc. Further, the fact that the HI emission feature at about 95 km/s seems no corresponding absorption suggests that G15.4+0.1 has likely an upper limit distance of about 10.5 kpc. 13CO spectrum to the remnant supports our measurement. The new distance revises parameters on its associated pulsar wind nebula and TeV source.