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Galaxies with Abnormally High Gas Content in the Diskстатья
- Авторы: Zasov A.V., Zaitseva N.A.
- Журнал: Astronomy Reports
- Том: 66
- Номер: 9
- Год издания: 2022
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 755
- Последняя страница: 765
- DOI: 10.1134/S1063772922090128
- Аннотация: The content of gas in galaxies with an anomalously high relative mass of hydrogen M_{HI}_M_* for a given mass of the stellar population M_* (VHR-galaxies) is considered, using the available samples of such galaxies. It is shown that, within the optical diameter D_{25}, the mass of HI in VHR galaxies, as well as in galaxies with “normal” HI content, is limited by a value that depends on the specific angular momentum of the disk. Outer gaseous disks beyond D_{25}, which contain the main amount of HI in most of the galaxies we consider, are gravitationally stable, and, as a rule, they retain an approximately constant value of the stability parameter Q_{gas} over a large range of radial distances. It allows to propose that the outer disks of VHR galaxies are not recently acquired, but are of great age, and their gravitational instability was the main regulator of star formation during their formation. In this case, the extended disks of galaxies should also include a low-brightness stellar components of old stars extending far beyond their optical diameter D_{25}.
- Добавил в систему: Зайцева Наталия Александровна