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Leo II Group: decoupled cores of NGC 3607 and NGC3608статья
Дата последнего поиска статьи во внешних источниках: 29 мая 2015 г.
- Авторы: Afanasiev V.L., Silchenko O.K.
- Журнал: Astronomical and Astrophysical Transactions
- Том: 26
- Номер: 4
- Год издания: 2007
- Издательство: Cambridge Scientific Publishers
- Местоположение издательства: Cambridge
- Первая страница: 311
- Последняя страница: 337
- DOI: 10.1080/10556790701553524
- Аннотация: The kinematics, structure, and stellar population properties in the centers of two brightest early-type galaxies of the Leo II group, NGC 3607 and NGC 3608, are studied by means of integral-field spectroscopy. The kinematically distinct areas in the centers of these galaxies, with radii of 6" and 5" respectively, are found also to be chemically distinct: they are characterized by enhanced magnesium-line strength. However, we have not found any stellar age differences between the decoupled cores and their outskirts. An analysis of two-dimensional line-of-sight velocity fields reveals systematic turns of kinematical major axes near the nuclei of both galaxies; in NGC 3608 the ionized gas rotates perpendicular to the stellar component rotation. When taking into account some morphological features, we conclude that both NGC 3607 and NGC 3608 have large triaxial stellar spheroids. We argue that the magnesium-enhanced cores are not circumnuclear disks; instead they resemble rather compact triaxial structures which force a formation of polar disks around them -- a gaseous one in NGC 3608 and a stellar-gaseous one in NGC 3607; in the latter the star formation is perhaps still proceeding.
- Добавил в систему: Сильченко Ольга Касьяновна