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

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

2008-06-23

arxiv.org/abs/0806.3643v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, to appear in Proc. IV Meeting about Dynamical Astronomy in Latin America, Mexico City, Feb. 12 - 16, 2008

Scientific paper

We use a sample of galaxies from the Sloan Digital Sky Survey (SDSS) to search for correlations between the $\lambda$ spin parameter and the environment and mass of galaxies. In order to calculate the total value of $\lambda$ 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 $\lambda$ 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 $\lambda$ distributions. We find, in agreement with some N-body cosmological simulations, no significant dependence of $\lambda$ on the environmental density of the galaxies. For the case of mass, our results show a marked correlation with $\lambda$, in the sense that low mass galaxies present both higher mean values of $\lambda$ 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.

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