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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad Nacional Autónoma de México
2008
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| Online Access: | https://www.redalyc.org/articulo.oa?id=57116170021 |
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Table of Contents:
- ENVIRONMENT AND MASS DEPENDENCIES OF GALACTIC A SPIN PARAMETER: COSMOLOGICAL SIMULATIONS AND SDSS GALAXIES COMPARED B. Cervantes-Sodi X. Hernández Ch. Park J. Kim Física, Astronomía y Matemáticas galaxies: formation galaxies: formation galaxies: structure galaxies: structure galaxies: statistics We use a sample of galaxies from the Sloan Digital Sky Survey (SDSS) to search for correlations between the ¿ spin parameter and the environment and mass of galaxies. In order to calculate the totalvalue of ¿ for each observed galaxy, we employ a simple model of the dynamical structure of the galaxies which allows a rough estimate of the value of ¿ 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 ¿ distributions. We find, in agreement with some N-body cosmological simulations, no significant dependence of ¿ on the environmental density of the galaxies. For the case of mass, our results show a marked correlation with ¿, in the sense that low mass galaxies present both higher mean values of ¿ and associated dispersions, than high mass galaxies. This last direct empirical result, at odds with expectations from N-body cosmological simulations, provides an interesting constraint on the mechanisms of galaxy formation and acquisition of angular momentum, a valuable test for cosmological models. 2008 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57116170021 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.34