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Testing the near-far connection with FIRE simulations: inferring the stellar mass function of the proto-Local Group at z > 6 using the fossil record of present-day galaxies
被引：2
|作者：
Gandhi, Pratik J.
[1
]
Wetzel, Andrew
[1
]
Boylan-Kolchin, Michael
[2
]
Sanderson, Robyn E.
[3
,4
]
Savino, Alessandro
[5
]
Weisz, Daniel R.
[5
]
Tollerud, Erik J.
[6
]
Sun, Guochao
[7
,8
]
Faucher-Giguere, Claude-Andre
[7
,8
]
机构：
[1] Univ Calif Davis, Dept Phys & Astron, One Shields Ave, Davis, CA 95616 USA
[2] Univ Texas Austin, Dept Astron, 2515 Speedway, Austin, TX 78712 USA
[3] Univ Penn, Dept Phys & Astron, 209 South 33rd St, Philadelphia, PA 19104 USA
[4] Flatiron Inst, Ctr Computat Astrophys, 162 Fifth Ave, New York, NY 10010 USA
[5] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
[6] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA
[7] Northwestern Univ, CIERA, 1800 Sherman Ave, Evanston, IL 60201 USA
[8] Northwestern Univ, Dept Phys & Astron, 1800 Sherman Ave, Evanston, IL 60201 USA
关键词：
galaxies: evolution;
galaxies: high-redshift;
Local Group;
dark ages;
reionization;
first stars;
STAR-FORMATION HISTORIES;
UV LUMINOSITY FUNCTION;
FAINT DWARF GALAXIES;
FORMING GALAXIES;
REIONIZATION;
MODEL;
MILKY;
II;
CONSTRAINTS;
END;
D O I：
10.1093/mnras/stae1584
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The shape of the low-mass (faint) end of the galaxy stellar mass function (SMF) or ultraviolet luminosity function (UVLF) at z greater than or similar to 6 is an open question for understanding which galaxies primarily drove cosmic reionization. Resolved photometry of Local Group low-mass galaxies allows us to reconstruct their star formation histories, stellar masses, and UV luminosities at early times, and this fossil record provides a powerful 'near-far' technique for studying the reionization-era SMF/UVLF, probing orders of magnitude lower in mass than direct HST/JWST observations. Using 882 low-mass (M-star less than or similar to 10(9)M(circle dot)) galaxies across 11 Milky Way (MW)- and Local Group-analogue environments from the FIRE-2 cosmological baryonic zoom-in simulations, we characterize their progenitors at z = 6-9, the mergers/disruption of those progenitors over time, and how well their present-day fossil record traces the high-redshift SMF. A present-day galaxy with M-star similar to 10(5 )M(circle dot) (similar to 10(9 )M(circle dot)) had approximate to 1 (approximate to 30) progenitors at z approximate to 7, and its main progenitor comprised approximate to 100 per cent (approximate to 10 per cent) of the total stellar mass of all its progenitors at z approximate to 7. We show that although only similar to 15 per cent of the early population of low-mass galaxies survives to present day, the fossil record of surviving Local Group galaxies accurately traces the low-mass slope of the SMF at z similar to 6-9. We find no obvious mass dependence to the mergers and accretion, and show that applying this reconstruction technique to just low-mass galaxies at z = 0 and not the MW/M31 hosts correctly recovers the slope of the SMF down to Mstar similar to 10(4.5 )M(circle dot) at z greater than or similar to 6. Thus, we validate the 'near-far' approach as an unbiased tool for probing low-mass reionization-era galaxies.
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页码：1059 / 1074
页数：16
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