Simulating galaxies in the reionization era with FIRE-2: morphologies and sizes
Simulating galaxies in the reionization era with FIRE-2: morphologies and sizes
复制标题
使用 FIRE-2 模拟再电离时代的星系:形态和大小
DOI:
10.1093/mnras/sty684
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发表时间:
2018
影响因子:
4.8
通讯作者:
Wetzel, Andrew
中科院分区:
文献类型:
--
作者:
Ma, Xiangcheng;Hopkins, Philip F;Boylan-Kolchin, Michael;Faucher-Giguère, Claude-André;Quataert, Eliot;Feldmann, Robert;Garrison-Kimmel, Shea;Hayward, Christopher C;Kereš, Dušan;Wetzel, Andrew
We study the morphologies and sizes of galaxies atz≥ 5 using high-resolution cosmological zoom-in simulations from the Feedback In Realistic Environments project. The galaxies show a variety of morphologies, from compact to clumpy to irregular. The simulated galaxies have more extended morphologies and larger sizes when measured using rest-frame opticalB-band light than rest-frame UV light; sizes measured from stellar mass surface density are even larger. The UV morphologies are usually dominated by several small, bright young stellar clumps that are not always associated with significant stellar mass. TheB-band light traces stellar mass better than the UV, but it can also be biased by the bright clumps. At all redshifts, galaxy size correlates with stellar mass/luminosity with large scatter. The half-light radii range from 0.01 to 0.2 arcsec (0.05–1 kpc physical) at fixed magnitude. Atz≥ 5, the size of galaxies at fixed stellar mass/luminosity evolves as (1 +z)−m, withm∼ 1–2. For galaxies less massive thanM*∼ 108M⊙, the ratio of the half-mass radius to the halo virial radius is ${\sim }10\hbox{ per cent}$ and does not evolve significantly atz= 5–10; this ratio is typically 1–5 per cent for more massive galaxies. A galaxy's ‘observed’ size decreases dramatically at shallower surface brightness limits. This effect may account for the extremely small sizes ofz≥ 5 galaxies measured in the Hubble Frontier Fields. We provide predictions for the cumulative light distribution as a function of surface brightness for typical galaxies atz= 6.
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DOI:
10.1111/j.1365-2966.2012.21981.x
发表时间:
2011-11
影响因子:
4.8
作者:
P. Hopkins;D. Keres̆;N. Murray;E. Quataert;Lars Hernquist Berkeley;Cita;Harvard
通讯作者:
P. Hopkins;D. Keres̆;N. Murray;E. Quataert;Lars Hernquist Berkeley;Cita;Harvard
影响因子:
4.8
作者:
Xiangcheng Ma;P. Hopkins;S. Garrison-Kimmel;C. Faucher-Giguère;E. Quataert;M. Boylan-Kolchin;C. Hayward
通讯作者:
Xiangcheng Ma;P. Hopkins;S. Garrison-Kimmel;C. Faucher-Giguère;E. Quataert;M. Boylan-Kolchin;C. Hayward
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
P. Hopkins;P. Hopkins;D. Narayanan;N. Murray
通讯作者:
N. Murray
DOI:
10.3847/2041-8213/aa7d4b
发表时间:
2017
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
S. Price;M. Kriek;R. Feldmann;E. Quataert;P. Hopkins;C. Faucher;D. Keres̆;G. Barro
通讯作者:
G. Barro
影响因子:
4.8
作者:
Christopher E. Moody;Yicheng Guo;Nir Mandelker;D. Ceverino;M. Mozena;D. Koo;A. Dekel;J. Primack
通讯作者:
J. Primack