pop-cosmos: a comprehensive picture of the galaxy population from COSMOS data
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
We present pop-cosmos: a comprehensive model characterizing the galaxy population, calibrated to 140,938 (r < 25 selected) galaxies from the Cosmic Evolution Survey (COSMOS) with photometry in 26 bands from the ultraviolet to the infrared. We construct a detailed forward model for the COSMOS data, comprising: a population model describing the joint distribution of galaxy characteristics and its evolution (parameterized by a flexible score-based diffusion model); a state-of-the-art stellar population synthesis model connecting galaxies' intrinsic properties to their photometry; and a data model for the observation, calibration, and selection processes. By minimizing the optimal transport distance between synthetic and real data, we are able to jointly fit the population and data models, leading to robustly calibrated population-level inferences that account for parameter degeneracies, photometric noise and calibration, and selection. We present a number of key predictions from our model of interest for cosmology and galaxy evolution, including the mass function and redshift distribution; the mass–metallicity-redshift and fundamental metallicity relations; the star-forming sequence; the relation between dust attenuation and stellar mass, star formation rate, and attenuation-law index; and the relation between gas-ionization and star formation. Our model encodes a comprehensive picture of galaxy evolution that faithfully predicts galaxy colors across a broad redshift (z < 4) and wavelength range.
Date Issued
2024-09-01
Date Acceptance
2024-06-25
Citation
Astrophysical Journal Supplement Series, 2024, 274 (1)
ISSN
0067-0049
Publisher
IOP Publishing
Journal / Book Title
Astrophysical Journal Supplement Series
Volume
274
Issue
1
Copyright Statement
© 2024. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
License URL
Identifier
10.3847/1538-4365/ad5c69
Subjects
Astronomy & Astrophysics
COMPLETE CALIBRATION
DATA RELEASE
DUST ATTENUATION CURVES
IA SUPERNOVAE
LARGE-SCALE BIAS
MASS-METALLICITY RELATION
PHOTOMETRIC REDSHIFTS
PHYSICAL-PROPERTIES
STAR-FORMING GALAXIES
STELLAR MASS
Publication Status
Published
Article Number
12
Date Publish Online
2024-09-02