Abstract / Description of output
Galaxies with stellar masses near M* contain the majority of stellar
mass in the universe, and are therefore of special interest in the study
of galaxy evolution. The Milky Way (MW) and Andromeda (M31) have
present-day stellar masses near M*, at 5 × 1010 M
⊙ (defined here to be MW-mass) and 1011 M
⊙ (defined to be M31-mass). We study the typical
progenitors of these galaxies using the FOURSTAR Galaxy Evolution Survey
(ZFOURGE). ZFOURGE is a deep medium-band near-IR imaging survey, which
is sensitive to the progenitors of these galaxies out to z ~ 3. We use
abundance-matching techniques to identify the main progenitors of these
galaxies at higher redshifts. We measure the evolution in the stellar
mass, rest-frame colors, morphologies, far-IR luminosities, and star
formation rates, combining our deep multiwavelength imaging with near-IR
Hubble Space Telescope imaging from Cosmic Near-IR Deep Extragalactic
Legacy Survey (CANDELS), and Spitzer and Herschel far-IR imaging from
Great Observatories Origins Deep Survey-Herschel and CANDELS-Herschel.
The typical MW-mass and M31-mass progenitors passed through the same
evolution stages, evolving from blue, star-forming disk galaxies at the
earliest stages to redder dust-obscured IR-luminous galaxies in
intermediate stages and to red, more quiescent galaxies at their latest
stages. The progenitors of the MW-mass galaxies reached each
evolutionary stage at later times (lower redshifts) and with stellar
masses that are a factor of two to three lower than the progenitors of
the M31-mass galaxies. The process driving this evolution, including the
suppression of star formation in present-day M* galaxies, requires an
evolving stellar-mass/halo-mass ratio and/or evolving halo-mass
threshold for quiescent galaxies. The effective size and SFRs imply that
the baryonic cold-gas fractions drop as galaxies evolve from high
redshift to z ~ 0 and are strongly anticorrelated with an increase in
the Sérsic index. Therefore, the growth of galaxy bulges in M*
galaxies corresponds to a rapid decline in the galaxy gas fractions
and/or a decrease in the star formation efficiency.
This paper contains data gathered with the 6.5 m Magellan
Telescopes located at Las Campanas Observatory, Chile.
Original language | English |
---|---|
Pages (from-to) | 26 |
Journal | Astrophysical Journal |
Volume | 803 |
Issue number | 1 |
DOIs | |
Publication status | Published - 9 Apr 2015 |
Keywords / Materials (for Non-textual outputs)
- galaxies: evolution
- galaxies: high-redshift
- galaxies: structure