The influence of the velocity dispersion on the velocity–density relation in the disk model of the galaxy
Authors:
- Szymon Sikora,
- Łukasz Bratek,
- Joanna Jałocha,
- Marek Kutschera
Abstract
Taking the velocity dispersion term into account in the Jeans equation describing the disk model, counterintuitively allows to reduce the local mass-to-light ratio at the outskirts of flattened galaxies, and stop the unbound growth of mass function. This is possible thanks to a more intertwined relation between the gravitational potential and the rotation curve than for spheroidal systems. This effect is illustrated on the example of galaxy UGC 6446 by finding iteratively the column mass density from the rotation curve supplemented with an isotropic velocity dispersion profile in the disk plane. Along with galactic magnetic fields, this effect would allow to reduce the local mass-to-light ratio at the galactic outskirts.
- Record ID
- CUT25923f9239004b6e981739471d6293b5
- Publication categories
- ;
- Author
- Journal series
- Acta Physica Polonica B, ISSN 0587-4254, e-ISSN 1509-5770, Monthly
- Issue year
- 2017
- Vol
- 48
- No
- 11
- Pages
- 2071-2092
- Other elements of collation
- wykr.; Bibliografia (na s.) - 2091-2092; Bibliografia (liczba pozycji) - 31; Oznaczenie streszczenia - Streszcz. ang.; Numeracja w czasopiśmie - Vol. 48, No 11
- Keywords in English
- disk model, rotation curves, velocity dispersion, velocity-density relation, galaxy UGC 6446
- DOI
- DOI:10.5506/APhysPolB.48.2071 Opening in a new tab
- URL
- http://www.actaphys.uj.edu.pl/acta_physica_polonica_b/?show_all=R Opening in a new tab
- Language
- eng (en) English
- License
- Score (nominal)
- 20
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUT25923f9239004b6e981739471d6293b5/
- URN
urn:pkr-prod:CUT25923f9239004b6e981739471d6293b5
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.