The minimum halo mass for star formation at z=6-8

Finlator, KristianNew Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA.;Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen, Denmark. (författare)

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.

Prescott, Moire K. M.New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA.;Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen, Denmark. (författare)
Oppenheimer, B. D.Univ Colorado, Dept Astrophys & Planetary Sci, CASA, 389 UCB, Boulder, CO 80309 USA. (författare)
Dave, RomeelUniv 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. (författare)
Zackrisson, ErikUppsala universitet,Observationell astrofysik(Swepub:uu)erzac792 (författare)
Livermore, R. C.Univ Texas Austin, 2515 Speedway,Stop C1400, Austin, TX 78712 USA. (författare)
Finkelstein, S. L.Univ Texas Austin, 2515 Speedway,Stop C1400, Austin, TX 78712 USA. (författare)
Thompson, RobertUniv Illinois, NCSA, Urbana, IL 61820 USA. (författare)
Huang, ShuiyaoUniv Massachusetts, Dept Astron, Amherst, MA 01003 USA. (författare)
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. (creator_code:org_t)

Ingår i:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)464:2, s. 1633-16390035-87111365-2966

Av författaren/redakt...: Finlator, Kristi ...; Prescott, Moire ...; Oppenheimer, B. ...; Dave, Romeel; Zackrisson, Erik; Livermore, R. C.; visa fler...; Finkelstein, S. ...; Thompson, Robert; Huang, Shuiyao; visa färre...

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