Optical observations of NGC 1156 galaxy in narrowband [SII] and Hα filters

Abstract

We present observations of a Magellanic-type dwarf irregular galaxy NGC 1156 in narrow band [SII] and Hα filters, carried out in November 2015, with the 2 m RCC telescope at Rozhen National Astronomical Observatory in Bulgaria. Although our observations were with the intention to find new extragalactic supernova remnant can- didates, we were successful in the detection of 59 HII regions. We give luminosity function and size distribution for the detected HII regions. Also, we found that re- lation between Hα luminosity and radius of HII regions in NGC 1156 has the slope of 2:7 ± 0:2 in logarithmic presentation, which is in good agreement with theoretical prediction for ionization-bounded HII regions.