Using the LOWZ (0.15 ≤ z ≤ 0.43) and CMASS (0.43 ≤ z ≤ 0.7) galaxy samples of the ninth data release from the Sloan Digital Sky Survey (SDSS) III Baryon Oscillation Spectroscopic Survey (BOSS), we investigate the environmental dependence of stellar mass of BOSS galaxies, and conclude that like the luminous red galaxy sample of the SDSS, the environmental dependence of stellar mass of BOSS galaxies is fairly weak. Results of this work also show that the CMASS sample with the redshift 0.43 ≤ z ≤ 0.7 used by many authors seriously suffers from the radial selection effect. PACS No.: 98.52.−b.Résumé : Utilisant les échantillons de galaxies LOWZ (0.15 < z < 0.43) et CMASS (0.43 < z < 0.7) de la 9 e parution du Sloan Digital Sky Survey (SDSS) III Baryon Oscillation Spectroscopic Survey (BOSS), nous étudions la dépendance environnementale de la masse stellaire des galaxies BOSS et concluons que, comme l'échantillon luminous red galaxy du SDSS, la dépendance environnementale de la masse stellaire des galaxies BOSS est assez faible. Nos résultats montrent aussi que l'échantillon CMASS avec le déplacement vers le rouge 0.43 < z < 0.7 utilisé par plusieurs auteurs souffre sérieusement de l'effets de sélection radiale. [Traduit par la Rédaction]

By cluster analysis, we study the clustering properties of Luminous Red Galaxies (LRGs) and compare them with those of Main galaxies . We find that the clustering properties of Luminous Red Galaxies is different from those of Main galaxies, and that LRGs cluster mainly in form of close double and multiple galaxies, galaxy groups.

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Comparisons of u-, g-, r-, i-, and z-band luminosity distributions between galaxy members of compact groups and isolated galaxies Key words galaxies: fundamental parameters -galaxies: statisticsTo investigate the environmental dependence of u-, g-, r-, i-, and z-band luminosities, we perform comparative studies of luminosity distributions between galaxy members of compact groups (CGs) and isolated galaxies. It is found that for the r, i, and z bands isolated galaxies have a higher proportion of faint galaxies and a lower proportion of luminous galaxies than galaxy members of CGs, but for the u band an opposite trend is observed. The correlation between the g-band luminosity and the environment has different trends in different luminosity regions.