A Flux-limited Sample of Dusty Star-forming Galaxies from the Atacama Cosmology Telescope: Physical Properties and the Case for Multiplicity
Year: 2025
Type: article
Abstract: We report the modeling of the millimeter and far-infrared (FIR) spectral energy distributions (SEDs) of 71 dusty star-forming galaxies (DSFGs) selected by the Atacama Cosmology Telescope (ACT) with a 5 σ flux density limit of 8 mJy at 220 GHz (1.4 mm). All sources were cross-identified with Herschel surveys at 500, 350, and 250 μ m, and 19 of our sources were observed with the Submillimeter Array (SMA). A probabilistic cataloging (PCAT) algorithm favors multiple unresolved flux components in the Herschel data for the majority of ACT-selected DSFGs. We compare the derived physical properties of the DSFGs obtained from modeling the flux densities with those from similar studies of DSFG populations. We find the median, 16th, and 84th percentiles for the following SED model parameters: redshift z phot = 3 . 3 − 0.6 + 0.7 , apparent size μ d = 5 . 2 − 2.4 + 0.9 kpc , apparent dust mass log 10 ( μ M d / M ⊙ ) = 9.1 4 − 0.04 + 0.12 , and cutoff temperature T c = 35 . 6 − 1.6 + 4.8 K for a power-law distribution, and the corresponding apparent FIR luminosity log 10 ( μ L IR / L ⊙ ) = 13 . 6 − 0.3 + 0.2 , where μ is the lensing magnification. While many of the properties broadly agree with those of samples of primarily lensed DSFGs, we exercise caution in interpreting them. ACT’s lower flux limit, the PCAT decomposition, and the SMA observations all suggest that some fraction of these DSFGs are likely to be un
Source: The Astrophysical Journal
Authors: Kirsten R. Hall, Jake B. Hassan, Richard M. Feder, Tobias A. Marriage, Michael Zemcov, Jesus Rivera
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,499
OpenAlex ID: W7107965127
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