Observatons of NGC 3077 Galaxy in Narrow Band [SII] and H_alpha Filters

TL;DR

This study observed the NGC 3077 galaxy's tidal arm using narrow band filters to identify supernova remnants and HII regions, finding no supernova remnants but discovering new low-brightness HII regions.

Contribution

First narrow band [SII] and H_alpha imaging of NGC 3077's tidal arm, identifying new HII regions and confirming absence of supernova remnants.

Findings

No supernova remnant candidates detected.

Discovery of several uncatalogued low-brightness HII regions.

Enhanced [SII] emission sources were not found.

Abstract

We present observations of the HI tidal arm near dwarf galaxy NGC 3077 (member of the M81 galaxy group) in narrow band [SII] and H_alpha filters. Observations were carried out in March 2011 with the 2m RCC telescope at NAO Rozhen, Bulgaria. Our search for possible supernova remnant candidates (identified as sources with enhanced [SII] emission relative to their H_alpha emission) in this region yielded no sources of this kind. Nevertheless, we found a number of objects with significant H_alpha emission that probably represent uncatalogued, low brightness HII regions.