1111.6971 (Ana Laura O'Mill et al.)

Galaxy triplets in SDSS-DR7: I. Catalogue    [PDF]

Ana Laura O'Mill, Fernanda Duplancic, Diego García Lambas, Carlos Valotto, Laerte Sodré Jr

We present a new catalogue of galaxy triplets derived from the Sloan Digital Sky Survey Data Release 7. The identification of systems was performed considering galaxies brighter than M_r=-20.5 and imposing constraints over the projected distances, radial velocity differences of neighbouring galaxies and isolation. To improve the identification of triplets we employed a data pixelization scheme, which allows to handle large amounts of data as in the SDSS photometric survey. Using spectroscopic and photometric data in the redshift range 0.01View original: http://arxiv.org/abs/1111.6971