VizieR Online Data Catalog: SNRs in six nearby galaxies (Leonidaki+, 2013)

Optical images were obtained with the 1.3m (f/7.7) Ritchey-Chretien telescope at the Skinakas Observatory on 2008 June 6-12 and 2009 November 16-18. A 2048x2048 ANDOR Tech CCD was used which has a 9.6x9.6arcmin² field of view and an image scale of 0.28arcsec/pix. Apart from 2009 November 18, all the other observing nights were photometric with seeing conditions ranging from 1.3 to 2.5arcsec. The observations were performed with the narrow-band Hα+[NII], [SII] and [OIII] filters. Broad-band continuum filters in red and blue were used to subtract the continuum from the Hα+[NII], [SII] and [OIII] images, respectively. The continuum filters used for the observations are centred on line-free regions of the spectra in order to avoid strong SNR emission lines to pass.

(6 data files).