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The minimum halo mass for star formation at z=6-8
New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA.;Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen, Denmark..
New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA.;Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen, Denmark..
Univ Colorado, Dept Astrophys & Planetary Sci, CASA, 389 UCB, Boulder, CO 80309 USA..
Univ Western Cape, Dept Phys, ZA-7535 Cape Town, South Africa.;South African Astron Observ, ZA-7525 Cape Town, South Africa.;African Inst Math Sci, ZA-7545 Cape Town, South Africa..
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2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 464, no 2, 1633-1639 p.Article in journal (Refereed) Published
Abstract [en]

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 M-UV=-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 10(9)-10(11) M-circle dot, we find that recent observations demand vigorous star formation in haloes at least as massive as (3.1, 5.6, 10.5) x10(9) M-circle dot at z =(6, 7, 8). Likewise, we find that Frontier Fields observations probe down to stellar masses of (8.1, 18, 32) x10(6) M-circle dot: 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.

Place, publisher, year, edition, pages
2017. Vol. 464, no 2, 1633-1639 p.
Keyword [en]
galaxies: evolution, galaxies: formation, galaxies: haloes, galaxies: high-redshift, cosmology: theory
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-316963DOI: 10.1093/mnras/stw2433ISI: 000393647100027OAI: oai:DiVA.org:uu-316963DiVA: diva2:1079519
Funder
Danish National Research FoundationSwedish Research CouncilWenner-Gren FoundationsSwedish National Space Board
Available from: 2017-03-08 Created: 2017-03-08 Last updated: 2017-11-29Bibliographically approved

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Zackrisson, Erik

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