The environmental dependence of u-, g-, r-, i-, and z-band luminosities for galaxies above and below the value of M {r/*}

Details The environmental dependence of u-, g-, r-, i-, and z-band luminosities for galaxies above and below the value of M {r/*} The environmental dependence of u-, g-, r-, i-, and z-band luminosities for galaxies above and below the value of M {r/*}

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012astl...38..213d&link_type=abstract

Astronomy Letters, Volume 38, Issue 4, pp.213-221

Statistics

Galaxy: Fundamental Parameters, Galaxies: Statistics

Scientific paper

Using two volume-limited Main galaxy samples of the Sloan Digital Sky Survey Data Release 6 (SDSS DR6), we have explored the difference of the environmental dependence of u-, g-, r-, i-, and z-band luminosities between galaxies above and below the value of M {r/*}. It turns out that in the luminous volume-limited sample, all the five band luminosities strongly correlate with local environments. Because the u-band luminosity of galaxies still strongly depends on local environments in the faint volumelimited sample, we conclude that M {r/*} is not an important characteristic parameter for the environmental dependence of the u-band luminosity. It is worth noting that for the u-band, the subsample at low density has a higher proportion of luminous galaxies and a lower proportion of faint galaxies than the one at high density, which is opposite to widely accepted conclusion: luminous galaxies exist preferentially in the densest regions of the universe, but faint galaxies are located preferentially in low density regions. Our results show that the environmental dependence of luminosity is not a single trend in different luminosity regions and for different bands.

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