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

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 $c{m}^{-3}$. From [OIII]/H$\beta$ ratio, shock velocity has been estimated, pre-shock density of $n_c=14$ $c{m}^{-3}$, explosion energy of $E=9.2\times 10^{50}$ ergs, interstellar extinction of $E(B-V)=0.28$, and neutral hydrogen column density of $N(HI)=1.53\times 10^{21}$ $c{m}^{-2}$ are reported.

arXiv comment20 pages, 4 tables, 4 figures. Accepted for publication in Astrophysics & Space Science

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