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    PHIBSS: Molecular Gas Content And Scaling Relations In Z Similar To 1-3 Massive, Main-Sequence Star-Forming Galaxies

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    2013_05_phibssmolecular.pdf (3.570Mb)
    Date
    2013-05
    Author
    Tacconi, L. J.
    Neri, R.
    Genzel, R.
    Combes, Francoise
    Bolatto, A.
    Cooper, Michael C.
    Wuyts, S.
    Bournaud, F.
    Burkert, A.
    Comerford, J.
    Cox, P.
    Davis, M.
    Schreiber, N. M. F.
    Garcia-Burillo, S.
    Gracia-Carpio, J.
    Lutz, D.
    Naab, T.
    Newman, S.
    Omont, A.
    Saintonge, A.
    Griffin, K. S.
    Shapley, A.
    Sternberg, Assaf
    Weiner, B.
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    Abstract
    We present PHIBSS, the IRAM Plateau de Bure high-z blue sequence CO 3-2 survey of the molecular gas properties in massive, main-sequence star-forming galaxies (SFGs) near the cosmic star formation peak. PHIBSS provides 52 CO detections in two redshift slices at z similar to 1.2 and 2.2, with log(M-*(M-circle dot)) >= 10.4 and log(SFR(M-circle dot/yr)) >= 1.5. Including a correction for the incomplete coverage of the M-*-SFR plane, and adopting a "Galactic" value for the CO-H-2 conversion factor, we infer average gas fractions of similar to 0.33 at z similar to 1.2 and similar to 0.47 at z similar to 2.2. Gas fractions drop with stellar mass, in agreement with cosmological simulations including strong star formation feedback. Most of the z similar to 1-3 SFGs are rotationally supported turbulent disks. The sizes of CO and UV/optical emission are comparable. The molecular-gas-star-formation relation for the z = 1-3 SFGs is near-linear, with a similar to 0.7 Gyr gas depletion timescale; changes in depletion time are only a secondary effect. Since this timescale is much less than the Hubble time in all SFGs between z similar to 0 and 2, fresh gas must be supplied with a fairly high duty cycle over several billion years. At given z and M-*, gas fractions correlate strongly with the specific star formation rate (sSFR). The variation of sSFR between z similar to 0 and 3 is mainly controlled by the fraction of baryonic mass that resides in cold gas.
    Department
    Astronomy
    Subject
    galaxies: evolution
    galaxies: high-redshift
    galaxies: ism
    ism:
    molecules
    spectral energy-distributions
    integral field spectroscopy
    dark-matter
    haloes
    iram legacy survey
    ultra deep field
    active galactic nuclei
    hubble-space-telescope
    lambda-cdm universe
    lyman break galaxy
    gamma-ray emission
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34747
    Citation
    Tacconi, L. J., R. Neri, R. Genzel, F. Combes, A. Bolatto, M. C. Cooper, S. Wuyts et al. "PHIBSS: molecular gas content and scaling relations in z~ 1-3 massive, main-sequence star-forming galaxies." The Astrophysical Journal 768, no. 1 (2013): 74.
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