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In this work we introduce a new method to perform the identification ofgroups of galaxies and present results of the identification of galaxy groupsin the Seventh Data Release of the Sloan Digital Sky Survey (SDSS-DR7). Ourmethodology follows an approach that resembles the standard friends-of-friends(FoF) method. However, it uses assumptions on the mass of the dark matter halohosting a group of galaxies to link galaxies in the group using a local linkinglength. Our method does not assumes any ad-hoc parameter for the identificationof groups, nor a linking length or a density threshold. This parameter-freenature of the method, and the robustness of its results, are the most importantpoints of our work. We describe the data used for our study and give details ofthe implementation of the method. We obtain galaxy groups and halo catalogs forfour volume limited samples whose properties are in good agreement withprevious works. They reproduces the expected stellar mass functions and followthe expected stellar-halo mass relation. We found that most of the stellarcontent in groups of galaxies comes from objects with $M_r$ absolute magnitudeslarger than -19, meaning that it is important to resolve the low luminositycomponents of groups of galaxies to acquire detailed information about theirproperties.

Galaxy groups and haloes in the SDSS-DR7