Optical Imaging and Spectroscopic Observation of the Galactic Supernova Remnant G85.9-0.6

TL;DR

This study presents the first optical imaging and spectroscopic observations of the galactic supernova remnant G85.9-0.6, revealing its morphology, interaction with HII regions, and physical parameters such as electron density and shock velocity.

Contribution

It provides new optical imaging and spectroscopic data for G85.9-0.6, including measurements of electron density, shock velocity, and explosion energy, which were not previously available.

Findings

[SII]/Hα ratio indicates interaction with HII regions

Electron density is approximately 395 cm^{-3}

Shock velocity and explosion energy are estimated

Abstract

Optical CCD imaging with H$\alpha$ and [SII] filters and spectroscopic observations of the galactic supernova remnant G85.9-0.6 have been performed for the first time. The CCD image data are taken with the 1.5m Russian-Turkish Telescope (RTT150) at TUBITAK National Observatory (TUG) and spectral data are taken with the Bok 2.3 m telescope on Kitt Peak, AZ. The images are taken with narrow-band interference filters H$\alpha$, [SII] and their continuum. [SII]/H$\alpha$ ratio image is performed. The ratio obtained from [SII]/H$\alpha$ is found to be $\sim$0.42, indicating that the remnant interacts with HII regions. G85.9-0.6 shows diffuse-shell morphology. [SII]$\lambda\lambda 6716/6731$ average flux ratio is calculated from the spectra, and the electron density $N_{e}$ is obtained to be 395 $cm^{-3}$. From [OIII]/H$\beta$ ratio, shock velocity has been estimated, pre-shock density of $n_{c}=14$ $cm^{-3}$, explosion energy of $E=9.2\times10^{50}$ ergs, interstellar extinction of $E(B-V)=0.28$, and neutral hydrogen column density of $N(HI)=1.53\times10^{21}$ $cm^{-2}$ are reported.