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Restoring the full velocity field in the gaseous disk of the spiral galaxy NGC 157статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Fridman A.M., Khoruzhii O.V., Lyakhovich V.V., Sil’chenko O.K., Zasov A.V., Afanasiev V.L., Dodonov S.N., Boulesteix J.
- Журнал: Astronomy and Astrophysics
- Том: 371
- Номер: 2
- Год издания: 2001
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: 538
- Последняя страница: 559
- DOI: 10.1051/0004-6361:20010392
- Аннотация: This paper is the first in a series of articles devoted to the construction and analysis of three-component vector velocity fields in the gaseous disks of spiral galaxies, and to the discovery of giant anticyclones near corotation which were predicted earlier. We analyse the line-of-sight velocity field of ionized gas in the spiral galaxy NGC 157 which has been obtained in the H-alpha emission line at the 6 m telescope of SAO RAS. The field contains more than 11 000 velocity estimates. The existence of systematic deviations of the observed gas velocities from pure circular motion is shown. A detailed investigation of these deviations is undertaken by applying a recently formulated method based on Fourier analysis of the azimuthal distributions of the line-of-sight velocities at different distances from the galactic center. As a result of the analysis, all the main parameters of the wave spiral pattern are determined: the corotation radius, the amplitudes and phases of the gas velocity perturbations at different radii, as well as the velocity of circular rotation of the disk corrected for the influence of the velocity perturbations connected with the spiral arms. Finally, a restoration of the vector velocity field in the gaseous disk of NGC 157 is performed. At a high confidence level, the presence of the two giant anticyclones in the reference frame rotating with the spiral pattern is shown; their sizes and the localization of their centers are consistent with the results of the analytic theory and of numerical simulations. Besides the anticyclones, the existence of cyclones in any residual velocity field is predicted. In the reference frame of the spiral pattern, detection of such cyclones is possible in the galaxies with a radial gradient of azimuthal residual velocity steeper than that of the rotation velocity.
- Добавил в систему: Сильченко Ольга Касьяновна