Evolution of the Gas Mass Fraction of Progenitors to Today's Massive Galaxies: ALMA Observations in the CANDELS GOODS-S Field Academic Article uri icon

abstract

  • Abstract We present an Atacama Large Millimeter/submillimeter Array (ALMA) survey of dust continuum emission in a sample of 70 galaxies in the redshift range z=25 selected from the CANDELS GOODS-S field. Multi-epoch abundance matching (MEAM) is used to define potential progenitors of a z=0 galaxy of stellar mass 1.51011 M . Gas masses are derived from the 850 m luminosity. Ancillary data from the CANDELS GOODS-S survey are used to derive the gas mass fractions. The results at z3 are mostly in accord with expectations: The detection rates are 75% for the z=2 redshift bin, 50% for the z=3 bin, and 0% for z4. The average gas mass fraction for the detected z=2 galaxies is f gas=0.550.12 and f gas=0.620.15 for the z=3 sample. This agrees with expectations for galaxies on the star-forming main sequence, and shows that gas fractions have decreased at a roughly constant rate from z=3 to z=0. Stacked images of the galaxies not detected with ALMA give upper limits to f gas of <0.08 and <0.15, for the z=2 and z=3 redshift bins. None of our galaxies in the z=4 and z=5 sample are detected, and the upper limit from stacked images, corrected for low metallicity, is f gas<0.66. We do not think that lower gas-phase metallicities can entirely explain the lower dust luminosities. We briefly consider the possibility of accretion of very low-metallicity gas to explain the absence of detectable dust emission in our galaxies at z4.

published proceedings

  • ASTROPHYSICAL JOURNAL

altmetric score

  • 7.58

author list (cited authors)

  • Wiklind, T., Ferguson, H. C., Guo, Y., Koo, D. C., Kocevski, D., Mobasher, B., ... de Mello, D. F.

citation count

  • 15

complete list of authors

  • Wiklind, Tommy||Ferguson, Henry C||Guo, Yicheng||Koo, David C||Kocevski, Dale||Mobasher, Bahram||Brammer, Gabriel B||Kassin, Susan||Koekemoer, Anton M||Giavalisco, Mauro||Papovich, Casey||Ravindranath, Swara||Faber, Sandra M||Freundlich, Jonathan||de Mello, Duilia F

publication date

  • June 2019