X-Ray Emission from Supernova Remnants Observed in the ASCA Galactic Plane Survey

TL;DR

This paper presents X-ray images and spectra of five supernova remnants from the ASCA survey, revealing their structures, absorption levels, and spectral characteristics, including thermal plasma features in one remnant.

Contribution

It provides detailed X-ray observations and spectral analysis of five SNRs, highlighting differences in their emission properties and thermal plasma signatures.

Findings

X-ray sizes are comparable to radio structures for four SNRs.

All SNRs show heavy interstellar absorption with N_H>10^{22} cm^{-2}.

G355.6-0.0 exhibits emission lines indicating thermal plasma origin.

Abstract

X-ray images and spectra of 5 cataloged supernova remnants (SNRs), G12.0-0.1, G346.6-0.2, G348.5+0.1, G348.7+0.3, and G355.6-0.0, observed in the ASCA galactic plane survey are presented. The sizes of X-ray emission from G12.0-0.1, G348.5+0.1, G348.7+0.3, and G355.6-0.0 are comparable to their radio structures, while that of G346.6-0.2 is smaller than the radio structure. The X-ray spectra of all of the SNRs were heavily absorbed by interstellar matter with N_H>10^{22} cm^{-2}. The spectrum of G355.6-0.0 exhibited emission lines, indicating that the X-ray emission has a thin thermal plasma origin, and was well represented by two-temperature thin thermal emission model. On the other hand, no clear emission line features were found in the spectra of the others and the spectra could be represented by either a thin thermal emission model or a power-law model.