Abstract
Three-dimensional panchromatic dust radiative transfer calculations are performed on a set of 198 galaxies of stellar masses in the range of 5 × 108 to 3 × 1010 M from a cosmological hydrodynamic simulation (resolved at 29 h -1 pc) at z 7. In a companion paper, the stellar mass and UV luminosity functions and the UV-optical and FUV-NUV colors are shown to be in good agreement with observations if a Small Magellanic Cloud type dust extinction curve is adopted. Here, we make useful predictions, self-consistently, of the infrared properties of these z 7 simulated galaxies that can be confronted with upcoming ALMA data. Our findings are as follows. (1) The effective radius in the rest-frame MIPS70 μm band is in the range of 80-400 pc proper for z = 7 galaxies with L FIR = 1011.3-10 12 L . (2) The median of the peak wavelength of the far-infrared (FIR) spectral energy distribution is in the range of 45-60 μm, depending on the dust-to-metal ratio. (3) For star formation rate in the range of 3-100 M yr-1, the median FIR to bolometric luminosity ratio is 60%-90%. (4) The FIR luminosity function displays a power law in the high end with a slope of -3.1 ± 0.4 instead of the usual exponential decline.
| Original language | English |
|---|---|
| Article number | 32 |
| Journal | Astrophysical Journal |
| Volume | 782 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2014 Feb 10 |
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Space and Planetary Science
- Astronomy and Astrophysics
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Infrared properties of z = 7 galaxies from cosmological simulations. / Cen, Renyue; Kimm, Taysun.
In: Astrophysical Journal, Vol. 782, No. 1, 32, 10.02.2014.Research output: Contribution to journal › Article
TY - JOUR
T1 - Infrared properties of z = 7 galaxies from cosmological simulations
AU - Cen, Renyue
AU - Kimm, Taysun
PY - 2014/2/10
Y1 - 2014/2/10
N2 - Three-dimensional panchromatic dust radiative transfer calculations are performed on a set of 198 galaxies of stellar masses in the range of 5 × 108 to 3 × 1010 M from a cosmological hydrodynamic simulation (resolved at 29 h -1 pc) at z 7. In a companion paper, the stellar mass and UV luminosity functions and the UV-optical and FUV-NUV colors are shown to be in good agreement with observations if a Small Magellanic Cloud type dust extinction curve is adopted. Here, we make useful predictions, self-consistently, of the infrared properties of these z 7 simulated galaxies that can be confronted with upcoming ALMA data. Our findings are as follows. (1) The effective radius in the rest-frame MIPS70 μm band is in the range of 80-400 pc proper for z = 7 galaxies with L FIR = 1011.3-10 12 L . (2) The median of the peak wavelength of the far-infrared (FIR) spectral energy distribution is in the range of 45-60 μm, depending on the dust-to-metal ratio. (3) For star formation rate in the range of 3-100 M yr-1, the median FIR to bolometric luminosity ratio is 60%-90%. (4) The FIR luminosity function displays a power law in the high end with a slope of -3.1 ± 0.4 instead of the usual exponential decline.
AB - Three-dimensional panchromatic dust radiative transfer calculations are performed on a set of 198 galaxies of stellar masses in the range of 5 × 108 to 3 × 1010 M from a cosmological hydrodynamic simulation (resolved at 29 h -1 pc) at z 7. In a companion paper, the stellar mass and UV luminosity functions and the UV-optical and FUV-NUV colors are shown to be in good agreement with observations if a Small Magellanic Cloud type dust extinction curve is adopted. Here, we make useful predictions, self-consistently, of the infrared properties of these z 7 simulated galaxies that can be confronted with upcoming ALMA data. Our findings are as follows. (1) The effective radius in the rest-frame MIPS70 μm band is in the range of 80-400 pc proper for z = 7 galaxies with L FIR = 1011.3-10 12 L . (2) The median of the peak wavelength of the far-infrared (FIR) spectral energy distribution is in the range of 45-60 μm, depending on the dust-to-metal ratio. (3) For star formation rate in the range of 3-100 M yr-1, the median FIR to bolometric luminosity ratio is 60%-90%. (4) The FIR luminosity function displays a power law in the high end with a slope of -3.1 ± 0.4 instead of the usual exponential decline.
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U2 - 10.1088/0004-637X/782/1/32
DO - 10.1088/0004-637X/782/1/32
M3 - Article
VL - 782
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 32
ER -