Infrared Spectral Energy Distributions and Dust Masses of Sub-solar Metallicity Galaxies at z similar to 2.3
| Autor: | 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 |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
ULTRA DEEP FIELD
MOSDEF-LRIS SURVEY PHYSICAL-PROPERTIES Astrophysics::Cosmology and Extragalactic Astrophysics INDIVIDUAL GALAXIES FORMATION RATES ALMA SPECTROSCOPIC SURVEY STELLAR POPULATION SYNTHESIS STAR-FORMING GALAXIES Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics HIGH-REDSHIFT Astrophysics::Galaxy Astrophysics INTERSTELLAR DUST |
| Zdroj: | Shivaei, I, Popping, G, Rieke, G, Reddy, N, Pope, A, Kennicutt, R, Mobasher, B, Coil, A, Fudamoto, Y, Kriek, M, Lyu, J, Oesch, P, Sanders, R, Shapley, A & Siana, B 2022, ' Infrared Spectral Energy Distributions and Dust Masses of Sub-solar Metallicity Galaxies at z similar to 2.3 ', Astrophysical Journal, vol. 928, no. 1, 68 . https://doi.org/10.3847/1538-4357/ac54a9 |
| DOI: | 10.3847/1538-4357/ac54a9 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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