Environment and mass dependencies of galactic $λ$ spin parameter: cosmological simulations and SDSS galaxies compared

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dc.creatorCervantes-Sodi, B.
dc.creatorHernandez, X.
dc.creatorPark, Changbom
dc.creatorKim, Juhan
dc.date2008-06-23
dc.date.accessioned2026-07-07T09:46:09Z
dc.date.available2026-07-07T09:46:09Z
dc.descriptionWe use a sample of galaxies from the Sloan Digital Sky Survey (SDSS) to search for correlations between the $λ$ spin parameter and the environment and mass of galaxies. In order to calculate the total value of $λ$ for each observed galaxy, we employed a simple model of the dynamical structure of the galaxies which allows a rough estimate of the value of $λ$ using only readily obtainable observables from the luminous galaxies. Use of a large volume limited sample (upwards of 11,000) allows reliable inferences of mean values and dispersions of $λ$ distributions. We find, in agreement with some N-body cosmological simulations, no significant dependence of $λ$ on the environmental density of the galaxies. For the case of mass, our results show a marked correlation with $λ$, in the sense that low mass galaxies present both higher mean values of $λ$ and associated dispersions, than high mass galaxies. This last direct empirical result, at odds with expectations from N-body cosmological simulations, provides interesting constrain on the mechanisms of galaxy formation and acquisition of angular momentum, a valuable test for cosmological models.
dc.description4 pages, 1 figure, to appear in Proc. IV Meeting about Dynamical Astronomy in Latin America, Mexico City, Feb. 12 - 16, 2008
dc.identifierhttps://arxiv.org/abs/0806.3643
dc.identifierhttp://arxiv.org/abs/0806.3643
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/163433
dc.subjectAstrophysics
dc.titleEnvironment and mass dependencies of galactic $λ$ spin parameter: cosmological simulations and SDSS galaxies compared
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