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Название: Are polar rings indeed polar?
Авторы: Smirnova, K. I.
Moiseev, A. V.
Дата публикации: 2013
Библиографическое описание: Smirnova K. I. Are polar rings indeed polar? / K. I. Smirnova, A. V. Moiseev // Astrophysical Bulletin. — 2013. — Vol. 68. — № 4. — P. 371-380.
Аннотация: We have considered polar ring galaxy candidates, the images of which can be found in the SDSS survey. The sample of 78 galaxies includes the most reliable candidates from the SPRC and PRC catalogs, some of which already have kinematic confirmations. We analyze the distributions of studied objects by the angle between the polar ring and the central disk, and by the optical diameter of the outer ring structures. In the vast majority of cases, the outer structures lie in the plane close to polar (within 10°-20°) which indicates the stability of the corresponding orbits in the gravitational potential of the halo. Moderately inclined outer structures are observed only in about 6% of objects which probably indicates their short lifetime. In such an unstable configuration, the polar ring would often cross the disk of the galaxy, being smaller than it in the diameter. We show that the inner polar structures and outer large-scale polar rings form a single family in the distribution of diameters normalized to the optical size of the galaxy. At the same time, this distribution is bimodal, as the number of objects with d ring = (0.4-0.7) d disk is small. Such a shape of size distribution is most likely due to the fact that the stability of polar orbits in the inner regions of galaxies is maintained by the bulge or the bar, while in the outer regions it is provided by the spheroidal (or triaxial) halo. © 2013 Pleiades Publishing, Ltd.
Ключевые слова: GALAXIES: PECULIAR
GALAXIES: PHOTOMETRY
URI: http://elar.urfu.ru/handle/10995/27371
Идентификатор РИНЦ: 21896287
Идентификатор SCOPUS: 84888597969
Идентификатор WOS: 000327599000001
Идентификатор PURE: 861393
ISSN: 1990-3413
DOI: 10.1134/S1990341313040019
Располагается в коллекциях:Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC

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