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Outer stellar disks and star-forming rings in S0 galaxiesстатья
- Авторы: Proshina I.S., Kniazev A.Y., Sil’chenko O.K.
- Сборник: Formation and Evolution of Galaxy Outskirts
- Серия: IAU Symposium
- Том: 321
- Год издания: 2017
- Издательство: CAMBRIDGE UNIV PRESS
- Местоположение издательства: 32 AVENUE OF THE AMERICAS, NEW YORK, USA,NY, 10013-2473
- Первая страница: 286
- Последняя страница: 286
- DOI: 10.1017/S1743921316011066
- Аннотация: Lenticular galaxies are disc galaxies which lack spiral arms and are thought to lack also gas and star formation in their disks. However we detect extended ionized-gas disks in the most nearby S0-galaxies populating sparse environments. Moreover, the statistics of the multiwavelength S0 images provides evidences for the presence of star formation in their outskirts in some 30% cases; and this star formation is typically organized as ring-like structures. By undertaking deep long-slit spectroscopy, we have measured stellar population properties - ages and metallicities - in the outer stellar disks of a sample of nearby S0 galaxies and have estimated the ionized-gas metallicities in their outer rings by the strong-line method. While the outer stellar disks of the galaxies under consideration have appeared to be very metal-poor, the gas in the rings reveals solar metallicity. We discuss the possible origin of the starforming rings in the outer disks of nearby S0-galaxies.
- Добавил в систему: Сильченко Ольга Касьяновна