Abstract 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 Hα and continuum-subtracted [S ii ]λλ6716, 6731 images and their ratios were used for the identification of SNRs. With [S ii ]/Hα ≥ 0.4 criteria, four possible SNR candidates were identified in NGC 2366 with [S ii ]/Hα ratios of ~ (0.68, 0.57, 0.55 and 0.75), Hα intensities of ~ (2.10, 0.36, 0.14, 0.11) × 10 − 15 erg cm − 2 s − 1 [S ii ]λ6716/λ6731 average flux ratios of ~ (1.01 and 1.04), electron densities of Ne ~ (582 and 513) cm − 3 and [O iii ] λ5007/Hβ λ4861 ~ (3.6 and 2.6) line ratio values are obtained for two of the SNR candidates. A shock velocity Vs of 80 ≤ Vs ≤ 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.

中文翻译：

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NGC 2366：对可能的超新星遗迹的光学搜索

摘要 介绍了对附近不规则星系 NGC 2366 中超新星遗迹 (SNR) 的光学搜索结果。我们使用 f/7.7 1.5 m 俄罗斯土耳其望远镜 (RTT150) 在位于土耳其安塔利亚的 TUBITAK 国家天文台 (TUG) 拍摄干涉滤光片图像并收集三个时期的光谱数据。连续相减的Hα和连续相减的[S ii ]λλ6716、6731幅图像及其比率用于识别信噪比。根据 [S ii ]/Hα ≥ 0.4 标准，在 NGC 2366 中确定了四种可能的 SNR 候选者，其中 [S ii ]/Hα 比率为~（0.68、0.57、0.55 和 0.75），Hα 强度为~（2.10、0.36、0.14 , 0.11) × 10 − 15 erg cm − 2 s − 1 [S ii ]λ6716/λ6731 平均通量比为 ~ (1.01 和 1.04)，电子密度为 Ne ~ (582 和 513) cm - 3 和 [O iii ] λ5007/Hβ λ4861 ~ (3.6 和 2. 6) 为两个 SNR 候选获得线比值。据报道，80 ≤ Vs ≤ 100 km s − 1 的冲击速度 Vs。首次获得这些可能的 SNR 候选者的频谱参数。发现此处获得的四个 SNR 的位置与迄今为止报告的光学和无线电结果一致。发现早期由 XMM-牛顿观测归类为扩展 X 射线源位置的源之一与此处报告的四种可能的 SNR 候选者之一一致。