# Optical observations of the nearby galaxy NGC 2366 through narrowband H$\alpha$ and SII filters. Supernova remnants status

## TL;DR

This study identifies 67 HII regions and two optical supernova remnant candidates in galaxy NGC 2366 using narrowband optical imaging, and suggests possible X-ray counterparts, refining previous classifications.

## Contribution

It provides the first detailed optical detection and characterization of SNR candidates in NGC 2366, including flux measurements and cross-wavelength analysis.

## Key findings

- Detected 67 HII regions and 2 SNR candidates.
- Suggested X-ray counterparts for two SNR candidates.
- Disproved previous radio SNR classifications as background galaxies.

## Abstract

We present detection of 67 HII regions and two optical supernova remnant (SNR) candidates in the nearby irregular galaxy NGC 2366. The SNR candidates were detected by applying [SII]/H$\alpha$ ratio criterion to observations made with the 2-m RCC telescope at Rozhen National Astronomical Observatory in Bulgaria. In this paper we report coordinates, diameters, H$\alpha$ and [SII] fluxes for detected objects across the two fields of view in NGC 2366 galaxy. Using archival XMM-Newton observations we suggest possible X-ray counterparts of two optical SNR candidates. Also, we discard classification of two previous radio SNR candidates in this galaxy, since they appear to be background galaxies.