The intrinsic properties of SDSS galaxies

Ariyeh H. Maller, Andreas A. Berlind, Michael R. Blanton, David W. Hogg

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The observed properties of galaxies vary with inclination; for most applications we would rather have properties that are independent of inclination, or intrinsic properties. One way to determine inclination corrections is to consider a large sample of galaxies, study how the observed properties of these galaxies depend on inclination, and then remove this dependence to recover the intrinsic properties. We perform such an analysis for galaxies selected from the Sloan Digital Sky Survey which have been matched to galaxies from the Two Micron All Sky Survey. We determine inclination corrections for these galaxies as a function of galaxy luminosity and the Sérsic index. In the g band these corrections reach as high as 1.2 mag and have a median value of 0.3 mag for all galaxies in our sample. We find that the corrections show little dependence on galaxy luminosity, except in the u band, but are strongly dependent on galaxy Sérsic index. We find that the ratio of red-to-blue galaxies changes from 1:1 to 1:2 when going from observed to intrinsic colors for galaxies in the range -22.75 < MK < -17.75. We also discuss how survey completeness and photometric redshifts should be determined when taking into account that observed and intrinsic properties differ. Finally, we examine whether previous determinations of stellar mass give an intrinsic quantity or one that depends on galaxy inclination.

    Original languageEnglish (US)
    Pages (from-to)394-406
    Number of pages13
    JournalAstrophysical Journal
    Volume691
    Issue number1
    DOIs
    StatePublished - Jan 20 2009

    Keywords

    • galaxies: clusters: general
    • galaxies: statistics
    • methods: statistical
    • surveys

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

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