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Optical Observations of Nearby Galaxies

Date

January 2018

Project Type

Observations

Location

National Astronomical Observatory Rozhen, Bulgaria
University of Belgrade, Serbia

Paper 1:

Optical Observations of the Nearby Galaxy IC342 with Narrow Band [SII] and H_alpha Filters. I

Paper 2:

Optical Observations of the Nearby Galaxy IC342 With Narrow Band [S II] and Hα Filters. II - Detection of 16 Optically-Identified Supernova Remnant Candidates

The observations are done through narrow band Hα and [SII] filters, and until now were mostly done on the 2m telescope at the National Astronomical Observatory (NAO) Rozhen, Bulgaria. We search for HII regions and supernova remnants. Supernova remnants are identified by their elevated [SII] /Hα > 0.4 ratios compared to HII regions.

Star formation rate in galaxies is usually derived based on their Hα fluxes, which should correlate with number of HII regions within the galaxy. By using [SII] /Hα criterion we found that supernova remnants can contaminate Hα flux of the observed galaxies to a few percent. By only observing in Hα line we cannot exclude these supernova remnants. Therefore, star formation rates based on just Hα observations are not very precise and it is important to correct them for supernova remnant contamination.