HII regions in NGC 628: the view of two catalogs

Ksenia I. Smirnova; Dmitri S. Wiebe

HII regions in NGC 628: the view of two catalogs

Astrophysics of Galaxies 2026-01-16 v1

Authors: Ksenia I. Smirnova , Dmitri S. Wiebe

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.

Keywords

HII regions NGC 628 interstellar medium radiation flux FWHM kinematic parameters shock ionization

Cite

@article{arxiv.2601.10642,
  title  = {HII regions in NGC 628: the view of two catalogs},
  author = {Ksenia I. Smirnova and Dmitri S. Wiebe},
  journal= {arXiv preprint arXiv:2601.10642},
  year   = {2026}
}

Comments

4 pages, 4 figures Conference Modern Astronomy: Science and Education (to the 270th Anniversary of Moscow University)

HII regions in NGC 628: the view of two catalogs

Abstract

Keywords

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