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Infall from peculiar velocities

Published online by Cambridge University Press:  06 October 2004

María Laura Ceccarelli ,
Carlos Valotto ,
Nelson Padilla ,
Diego G. Lambas ,
Riccardo Giovanelli  and
Martha Haynes
María Laura Ceccarelli
Affiliation:
IATE Group, Observatorio Astronómico, Universidad Nacional de Córdoba, Argentina
Carlos Valotto
Affiliation:
IATE Group, Observatorio Astronómico, Universidad Nacional de Córdoba, Argentina
Nelson Padilla
Affiliation:
Department of Physics, University of Durham, UK
Diego G. Lambas
Affiliation:
IATE Group, Observatorio Astronómico, Universidad Nacional de Córdoba, Argentina
Riccardo Giovanelli
Affiliation:
Department of Astronomy, Cornell University, USA
Martha Haynes
Affiliation:
Department of Astronomy, Cornell University, USA
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Abstract

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We perform a statistical analysis to study the infall of galaxies onto groups and clusters in the nearby Universe. The study is based on the UZC/SSRS2 group catalogs and galaxy peculiar velocity data. We find a clear signature of infall of galaxies onto groups in a large range of scales 5 Mpc h$^{-1} < r < 30$ Mpc h$^{-1}$. We obtain a significant increase of the infall amplitude with group mass derived from virial equilibrium and from the luminosity of the member galaxies. We compare the observational results with mock catalogs derived from numerical simulations of semi-analytical models where we obtain a behavior similar to observations.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUC195 , March 2004 , pp. 212 - 214
Copyright
© 2004 International Astronomical Union