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SDSS-IV MaNGA: Ionization Sources of Diffuse Extraplanar Gas in Disk Galaxiesтезисы доклада
- Авторы: Postnikova Vera, Bizyaev Dmitry
- Сборник: Astronomical Surveys and Big Data 3 (ASBD-3): Abstracts of Contributions
- Тезисы
- Год издания: 2025
- Место издания: Byurakan, Armenia
- Аннотация: Sources of ionization of diffuse ionized gas at various heights in 436 edge-on disk galaxies are explored depending on their global properties. The MaNGA (Mapping Nearby Galaxies at Apache Point Observatory) integral field spectroscopy survey data from DR17 of SDSS-IV project together with photoionization and shock ionization theoretical models from the 3MdB (Mexican Million Models database) are used. With a large number of galaxies in the sample, we reach very high galactic altitudes by employing spectra stacking procedure. It is demonstrated that photoionization models considering the joint contribution of young OB-stars and hot low-mass evolved stars adequately describe the gas ionization state in the galaxies of all types. Moreover, the fraction of the ionizing flux from OB-stars and the ionization parameter decrease with the altitude, while the role of the ionization by the hot low-mass evolved stars increases. The difference in the contribution from these types of ionizing sources correlates with the specific star formation rate and with stellar masses of galaxies. The hot low-mass evolved stars are the principal gas ionization sources in massive galaxies and galaxies with low specific star formation rate, whereas OB-stars dominate the gas ionization in low-mass galaxies and galaxies with high specific star formation rate. Yet, the shock waves may partially contribute to the gas ionization at high altitudes in massive galaxies and galaxies with low specific star formation rate. The study is conducted with the support of the Russian Science Foundation, grant No. 22-12-00080.
- Добавил в систему: Постникова Вера Константиновна