Infrared Spectral Energy Distributions and Dust Masses of Sub-solar Metallicity Galaxies at z similar to 2.3
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Infrared Spectral Energy Distributions and Dust Masses of Sub-solar Metallicity Galaxies at z similar to 2.3. / Shivaei, Irene; Popping, Gergoe; Rieke, George; Reddy, Naveen; Pope, Alexandra; Kennicutt, Robert; Mobasher, Bahram; Coil, Alison; Fudamoto, Yoshinobu; Kriek, Mariska; Lyu, Jianwei; Oesch, Pascal; Sanders, Ryan; Shapley, Alice; Siana, Brian.
In: Astrophysical Journal, Vol. 928, No. 1, 68, 01.03.2022.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Infrared Spectral Energy Distributions and Dust Masses of Sub-solar Metallicity Galaxies at z similar to 2.3
AU - Shivaei, Irene
AU - Popping, Gergoe
AU - Rieke, George
AU - Reddy, Naveen
AU - Pope, Alexandra
AU - Kennicutt, Robert
AU - Mobasher, Bahram
AU - Coil, Alison
AU - Fudamoto, Yoshinobu
AU - Kriek, Mariska
AU - Lyu, Jianwei
AU - Oesch, Pascal
AU - Sanders, Ryan
AU - Shapley, Alice
AU - Siana, Brian
PY - 2022/3/1
Y1 - 2022/3/1
N2 - We present results from Atacama Large Millimeter/submillimeter Array (ALMA) 1.2 mm continuum observations of a sample of 27 star-forming galaxies at z = 2.1-2.5 from the MOSFIRE Deep Evolution Field survey with metallicity and star formation rate measurements from optical emission lines. Using stacks of Spitzer, Herschel, and ALMA photometry (rest frame similar to 8-400 mu m), we examine the infrared (IR) spectral energy distributions (SED) of z similar to 2.3 subsolar-metallicity (similar to 0.5 Z (circle dot)) luminous infrared galaxies (LIRGs). We find that the data agree well with an average template of higher-luminosity local low-metallicity dwarf galaxies (reduced chi (2) = 1.8). When compared with the commonly used templates for solar-metallicity local galaxies or high-redshift LIRGs and ultraluminous IR galaxies, even in the most favorable case (with reduced chi (2) = 2.8), the templates are rejected at >98% confidence. The broader and hotter IR SED of both the local dwarfs and high-redshift subsolar-metallicity galaxies may result from different grain properties or a harder/more intense ionizing radiation field that increases the dust temperature. The obscured star formation rate (SFR) indicated by the far-IR emission of the subsolar-metallicity galaxies is only similar to 60% of the total SFR, considerably lower than that of the local LIRGs with similar to 96%-97% obscured fractions. Due to the evolving IR SED shape, the local LIRG templates fit to mid-IR data overestimate the Rayleigh-Jeans tail measurements by a factor of 2-20. These templates underestimate IR luminosities if fit to the observed ALMA fluxes by >0.4 dex. At a given stellar mass or metallicity, dust masses at z similar to 2.3 are an order of magnitude higher than z similar to 0. Given the predicted molecular gas fractions, the observed z similar to 2.3 dust-to-stellar mass ratios suggest lower dust-to-molecular gas masses than in local galaxies with similar metallicities.
AB - We present results from Atacama Large Millimeter/submillimeter Array (ALMA) 1.2 mm continuum observations of a sample of 27 star-forming galaxies at z = 2.1-2.5 from the MOSFIRE Deep Evolution Field survey with metallicity and star formation rate measurements from optical emission lines. Using stacks of Spitzer, Herschel, and ALMA photometry (rest frame similar to 8-400 mu m), we examine the infrared (IR) spectral energy distributions (SED) of z similar to 2.3 subsolar-metallicity (similar to 0.5 Z (circle dot)) luminous infrared galaxies (LIRGs). We find that the data agree well with an average template of higher-luminosity local low-metallicity dwarf galaxies (reduced chi (2) = 1.8). When compared with the commonly used templates for solar-metallicity local galaxies or high-redshift LIRGs and ultraluminous IR galaxies, even in the most favorable case (with reduced chi (2) = 2.8), the templates are rejected at >98% confidence. The broader and hotter IR SED of both the local dwarfs and high-redshift subsolar-metallicity galaxies may result from different grain properties or a harder/more intense ionizing radiation field that increases the dust temperature. The obscured star formation rate (SFR) indicated by the far-IR emission of the subsolar-metallicity galaxies is only similar to 60% of the total SFR, considerably lower than that of the local LIRGs with similar to 96%-97% obscured fractions. Due to the evolving IR SED shape, the local LIRG templates fit to mid-IR data overestimate the Rayleigh-Jeans tail measurements by a factor of 2-20. These templates underestimate IR luminosities if fit to the observed ALMA fluxes by >0.4 dex. At a given stellar mass or metallicity, dust masses at z similar to 2.3 are an order of magnitude higher than z similar to 0. Given the predicted molecular gas fractions, the observed z similar to 2.3 dust-to-stellar mass ratios suggest lower dust-to-molecular gas masses than in local galaxies with similar metallicities.
KW - STAR-FORMING GALAXIES
KW - ALMA SPECTROSCOPIC SURVEY
KW - ULTRA DEEP FIELD
KW - STELLAR POPULATION SYNTHESIS
KW - MOSDEF-LRIS SURVEY
KW - HIGH-REDSHIFT
KW - INTERSTELLAR DUST
KW - INDIVIDUAL GALAXIES
KW - FORMATION RATES
KW - PHYSICAL-PROPERTIES
U2 - 10.3847/1538-4357/ac54a9
DO - 10.3847/1538-4357/ac54a9
M3 - Journal article
VL - 928
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 68
ER -
ID: 302540579