Galaxy triplets in SDSS-DR7: I. Catalogue
Ana Laura O'Mill, Fernanda Duplancic, Diego Garc\'ia Lambas, Carlos, Valotto, Laerte Sodr\'e Jr

TL;DR
This paper introduces a new catalogue of galaxy triplets from SDSS-DR7, using a pixelization scheme and combined data to identify and analyze triplet systems with high completeness and low contamination, covering a broad redshift range.
Contribution
The paper presents a novel method for identifying galaxy triplets using pixelization and combined spectroscopic and photometric data, resulting in a comprehensive catalogue with improved completeness.
Findings
High completeness (~80%) in triplet identification.
Low contamination (~5%) in the catalogue.
Photometric redshifts effectively extend triplet detection to larger distances.
Abstract
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 0.01<z<0.40 we obtain 5901 triplet candidates. We have used a mock catalogue to analyse the completeness and contamination of our methods. The results show a high level of completeness (~80%) and low contamination (~5%). By using photometric and spectroscopic data we have also addressed the effects of fiber collisions in the spectroscopic sample. We have…
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Taxonomy
TopicsAstronomy and Astrophysical Research · Galaxies: Formation, Evolution, Phenomena · Stellar, planetary, and galactic studies
