PRIMUS

EFFECTS of GALAXY ENVIRONMENT on the QUIESCENT FRACTION EVOLUTION at z < 0.8

Changhoon Hahn, Michael R. Blanton, John Moustakas, Alison L. Coil, Richard J. Cool, Daniel J. Eisenstein, Ramin A. Skibba, Kenneth C. Wong, Guangtun Zhu

    Research output: Contribution to journalArticle

    Abstract

    We investigate the effects of galaxy environment on the evolution of the quiescent fraction (f<inf>Q</inf>) from z = 0.8 to 0.0 using spectroscopic redshifts and multi-wavelength imaging data from the PRIsm MUlti-object Survey (PRIMUS) and the Sloan Digital Sky Survey (SDSS). Our stellar mass limited galaxy sample consists of ∼14,000 PRIMUS galaxies within z = 0.2-0.8 and ∼64,000 SDSS galaxies within z = 0.05-0.12. We classify the galaxies as quiescent or star-forming (SF) based on an evolving specific star formation cut, and as low or high density environments based on fixed cylindrical aperture environment measurements on a volume-limited environment defining population. For quiescent and SF galaxies in low or high density environments, we examine the evolution of their stellar mass function (SMF). Then using the SMFs we compute f<inf>Q</inf> (M<inf>∗</inf>) and quantify its evolution within our redshift range. We find that the quiescent fraction is higher at higher masses and in denser environments. The quiescent fraction rises with cosmic time for all masses and environments. At a fiducial mass of 10<sup>10.5</sup> M<inf>⊙</inf>, from z ∼ 0.7 to 0.1, the quiescent fraction rises by 15% at the lowest environments and by 25% at the highest environments we measure. These results suggest that for a minority of galaxies their cessation of star formation is due to external influences on them. In other words, in the recent universe a substantial fraction of the galaxies that cease forming stars do so due to internal processes.

    Original languageEnglish (US)
    Article number162
    JournalAstrophysical Journal
    Volume806
    Issue number2
    DOIs
    StatePublished - Jun 20 2015

    Fingerprint

    galaxies
    stellar mass
    stars
    star formation
    minorities
    universe
    apertures
    wavelength
    wavelengths

    Keywords

    • cosmology: observations
    • galaxies: evolution
    • galaxies: groups: general
    • galaxies: star formation
    • galaxies: statistics

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Hahn, C., Blanton, M. R., Moustakas, J., Coil, A. L., Cool, R. J., Eisenstein, D. J., ... Zhu, G. (2015). PRIMUS: EFFECTS of GALAXY ENVIRONMENT on the QUIESCENT FRACTION EVOLUTION at z < 0.8. Astrophysical Journal, 806(2), [162]. https://doi.org/10.1088/0004-637X/806/2/162

    PRIMUS : EFFECTS of GALAXY ENVIRONMENT on the QUIESCENT FRACTION EVOLUTION at z < 0.8. / Hahn, Changhoon; Blanton, Michael R.; Moustakas, John; Coil, Alison L.; Cool, Richard J.; Eisenstein, Daniel J.; Skibba, Ramin A.; Wong, Kenneth C.; Zhu, Guangtun.

    In: Astrophysical Journal, Vol. 806, No. 2, 162, 20.06.2015.

    Research output: Contribution to journalArticle

    Hahn, C, Blanton, MR, Moustakas, J, Coil, AL, Cool, RJ, Eisenstein, DJ, Skibba, RA, Wong, KC & Zhu, G 2015, 'PRIMUS: EFFECTS of GALAXY ENVIRONMENT on the QUIESCENT FRACTION EVOLUTION at z < 0.8', Astrophysical Journal, vol. 806, no. 2, 162. https://doi.org/10.1088/0004-637X/806/2/162
    Hahn C, Blanton MR, Moustakas J, Coil AL, Cool RJ, Eisenstein DJ et al. PRIMUS: EFFECTS of GALAXY ENVIRONMENT on the QUIESCENT FRACTION EVOLUTION at z < 0.8. Astrophysical Journal. 2015 Jun 20;806(2). 162. https://doi.org/10.1088/0004-637X/806/2/162
    Hahn, Changhoon ; Blanton, Michael R. ; Moustakas, John ; Coil, Alison L. ; Cool, Richard J. ; Eisenstein, Daniel J. ; Skibba, Ramin A. ; Wong, Kenneth C. ; Zhu, Guangtun. / PRIMUS : EFFECTS of GALAXY ENVIRONMENT on the QUIESCENT FRACTION EVOLUTION at z < 0.8. In: Astrophysical Journal. 2015 ; Vol. 806, No. 2.
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    abstract = "We investigate the effects of galaxy environment on the evolution of the quiescent fraction (fQ) from z = 0.8 to 0.0 using spectroscopic redshifts and multi-wavelength imaging data from the PRIsm MUlti-object Survey (PRIMUS) and the Sloan Digital Sky Survey (SDSS). Our stellar mass limited galaxy sample consists of ∼14,000 PRIMUS galaxies within z = 0.2-0.8 and ∼64,000 SDSS galaxies within z = 0.05-0.12. We classify the galaxies as quiescent or star-forming (SF) based on an evolving specific star formation cut, and as low or high density environments based on fixed cylindrical aperture environment measurements on a volume-limited environment defining population. For quiescent and SF galaxies in low or high density environments, we examine the evolution of their stellar mass function (SMF). Then using the SMFs we compute fQ (M∗) and quantify its evolution within our redshift range. We find that the quiescent fraction is higher at higher masses and in denser environments. The quiescent fraction rises with cosmic time for all masses and environments. At a fiducial mass of 1010.5 M⊙, from z ∼ 0.7 to 0.1, the quiescent fraction rises by 15{\%} at the lowest environments and by 25{\%} at the highest environments we measure. These results suggest that for a minority of galaxies their cessation of star formation is due to external influences on them. In other words, in the recent universe a substantial fraction of the galaxies that cease forming stars do so due to internal processes.",
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    AU - Moustakas, John

    AU - Coil, Alison L.

    AU - Cool, Richard J.

    AU - Eisenstein, Daniel J.

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    AU - Zhu, Guangtun

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