TY - JOUR
T1 - Cosmology with Galaxy Photometry Alone
AU - Hahn, Chang Hoon
AU - Villaescusa-Navarro, Francisco
AU - Melchior, Peter
AU - Teyssier, Romain
N1 - Publisher Copyright:
© 2024. The Author(s). Published by the American Astronomical Society.
PY - 2024/5/1
Y1 - 2024/5/1
N2 - We present the first cosmological constraints using only the observed photometry of galaxies. Villaescusa-Navarro et al. recently demonstrated that the internal physical properties of a single simulated galaxy contain a significant amount of cosmological information. These physical properties, however, cannot be directly measured from observations. In this work, we present how we can go beyond theoretical demonstrations to infer cosmological constraints from actual galaxy observables (e.g., optical photometry) using neural density estimation and the CAMELS suite of hydrodynamical simulations. We find that the cosmological information in the photometry of a single galaxy is limited. However, we combine the constraining power of photometry from many galaxies using hierarchical population inference and place significant cosmological constraints. With the observed photometry of ∼20,000 NASA-Sloan Atlas galaxies, we constrain Ω m = 0.323 − 0.095 + 0.075 and σ 8 = 0.799 − 0.085 + 0.088 .
AB - We present the first cosmological constraints using only the observed photometry of galaxies. Villaescusa-Navarro et al. recently demonstrated that the internal physical properties of a single simulated galaxy contain a significant amount of cosmological information. These physical properties, however, cannot be directly measured from observations. In this work, we present how we can go beyond theoretical demonstrations to infer cosmological constraints from actual galaxy observables (e.g., optical photometry) using neural density estimation and the CAMELS suite of hydrodynamical simulations. We find that the cosmological information in the photometry of a single galaxy is limited. However, we combine the constraining power of photometry from many galaxies using hierarchical population inference and place significant cosmological constraints. With the observed photometry of ∼20,000 NASA-Sloan Atlas galaxies, we constrain Ω m = 0.323 − 0.095 + 0.075 and σ 8 = 0.799 − 0.085 + 0.088 .
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U2 - 10.3847/2041-8213/ad3f1e
DO - 10.3847/2041-8213/ad3f1e
M3 - Article
AN - SCOPUS:85192241590
SN - 2041-8205
VL - 966
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L18
ER -