Abstract / Description of output
Recent analysis of strongly lensed sources in the Hubble Frontier Fields
indicates that the rest-frame UV luminosity function of galaxies at z =
6-8 rises as a power law down to MUV = -15, and possibly as
faint as -12.5. We use predictions from a cosmological radiation
hydrodynamic simulation to map these luminosities on to physical space,
constraining the minimum dark matter halo mass and stellar mass that the
Frontier Fields probe. While previously published theoretical studies
have suggested or assumed that early star formation was suppressed in
haloes less massive than 109-1011
M⊙, we find that recent observations demand vigorous star
formation in haloes at least as massive as (3.1, 5.6, 10.5) ×
109 M⊙ at z = (6, 7, 8). Likewise, we find
that Frontier Fields observations probe down to stellar masses of (8.1,
18, 32) × 106 M⊙: that is, they are
observing the likely progenitors of analogues to Local Group dwarfs such
as Pegasus and M32. Our simulations yield somewhat different constraints
than two complementary models that have been invoked in similar
analyses, emphasizing the need for further observational constraints on
the galaxy-halo connection.
Original language | English |
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Pages (from-to) | 1633-1639 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 464 |
Issue number | 2 |
DOIs | |
Publication status | Published - 23 Sept 2016 |
Keywords / Materials (for Non-textual outputs)
- galaxies: evolution
- galaxies: formation
- galaxies: haloes
- galaxies: high-redshift
- cosmology: theory