NGC 2366: An optical search for possible supernova remnants

The results of an optical search for supernova remnants (SNRs) in the nearby irregular galaxy NGC 2366 are presented. We took interference filter images and collected spectral data in three epochs with the f/7.7 1.5 m Russian Turkish Telescope (RTT150) at TUBITAK National Observatory (TUG) located in Antalya, Turkey. The continuum-subtracted H alpha and continuum-subtracted [S-II]lambda lambda 6716, 6731 images and their ratios were used for the identification of SNRs. With [S-II]H alpha > 0.4 criteria, four possible SNR candidates were identified in NGC 2366 with [S-II]/H alpha ratios of similar to (0.68, 0.57, 0.55 and 0.75), Ha intensities of similar to (2.10, 0.36, 0.14, 0.11)x 10(-15) erg cm(-2) s(-1) [S-II]lambda 6716/lambda 6731 average flux ratios of similar to (1.01 and 1.04), electron densities of N-e similar to (582 and 513) cm(-3) and [O-III]lambda 5007/H beta lambda 4861 similar to (3.6 and 2.6) line ratio values are obtained for two of the SNR candidates. A shock velocity V-s of 80 <= V-s <= 100 km s(-1) is reported. The spectral parameters are obtained for the first time for these possible SNR candidates. The locations of the four SNRs obtained here are found to be consistent with optical and radio results reported so far. One of the sources categorised earlier by XMM-Newton observations as an extended X-ray source position is found to be consistent with one of four possible SNR candidates reported here.