HII regions in NGC 628: the view of two catalogs

TL;DR

This study compares interstellar medium parameters of HII regions in NGC 628 from two catalogs, revealing differences in line widths and potential misclassifications, enhancing understanding of star-forming regions.

Contribution

It provides a comparative analysis of two catalogs of HII regions in NGC 628, highlighting differences and potential misclassifications in their parameters.

Findings

Groves catalog regions have higher line widths.

Possible misclassification of some regions as HII regions.

Differences in spatial distribution and radiation fluxes.

Abstract

The study is devoted to comparing the parameters of the interstellar medium of HII regions in the Kongiu and Groves catalogs for the galaxy NGC 628. The article analyzes the characteristics of star-forming regions, including a comparison of radiation fluxes in the ranges of 7.7 $\mu$m and 21 $\mu$m and in the H$\alpha$, H$\beta$, OIII and CO lines, calculating the kinematic parameters (FWHM) for the lines, and analyzing the spatial distribution of regions for both catalogs. The results of the study showed that the regions from the Groves catalog demonstrate higher line widths compared to the Kongiu catalog. Signs of possible misidentified classification of some regions from the Groves catalog were revealed: there is a possibility that some of them are not HII regions, but shock ionization regions.