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Decoupled Gas Kinematics in Isolated Early-Type Disc Galaxiesстатья
- Авторы: Katkov I., Sil’chenko O.K., Afanasiev V.
- Сборник: Multi-Spin Galaxies
- Серия: Astronomical Society of the Pacific Conference Series
- Том: 486
- Год издания: 2014
- Первая страница: 149
- Последняя страница: 152
- Аннотация: We have studied a sample of completely isolated galaxies by means of long-slit spectroscopy at the 6-m telescope. We have found that 7 of 12, (58 ± 14)%, galaxies have revealed a presence of large-scale ionized-gas component which angular momentum is mostly differ from stellar one: 5 of 7, (71 ± 17)%, show a visible counter-rotation. The diagnostic diagram demonstrates a wide range of gas excitation mechanism. We have estimated the gas oxygen abundance in the cases where excitation mechanism by young stars dominates and have found that ionized gas has a subsolar metallicity. We concluded that cold-gas accretion from primordial cosmological filaments is unlikely for these objects, while external accretion from dwarf gas-rich satellites is more suitable.
- Добавил в систему: Сильченко Ольга Касьяновна