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Reconstructing galaxy star formation histories from COSMOS2020 photometry using simulation-based inference

G Aufort, C Laigle, HJ McCracken, DL Borgne… - arXiv preprint arXiv …, 2024 - arxiv.org
Astrophysics paper astro-ph.GA Suggest

… Our method combines the simulation-based inference (SBI) framework using a neural network trained with SFHs and photometry from the Horizon-AGN hydrodynamical …

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BibTeX

@article{2410.00795v1,
Author        = {G. Aufort and C. Laigle and H. J. McCracken and D. Le Borgne and R. Arango-Toro and L. Ciesla and O. Ilbert and L. Tresse and Y. Dubois},
Title         = {Reconstructing galaxy star formation histories from COSMOS2020
  photometry using simulation-based inference},
Eprint        = {2410.00795v1},
DOI           = {10.1051/0004-6361/202452457},
ArchivePrefix = {arXiv},
PrimaryClass  = {astro-ph.GA},
Abstract      = {We propose a novel method to reconstruct the full posterior distribution of
the star formation histories (SFHs) of galaxies from broad-band photometry. Our
method combines simulation-based inference (SBI) using a neural network trained
with SFHs and photometry from the {\sc Horizon-AGN} hydrodynamical cosmological
simulation. We apply it to reconstruct SFHs using COSMOS2020 photometry at
redshift $0<z<3$. We are able to accurately estimate the SFH and quantify the
uncertainty on simulated data, with an unbiased posterior mean and well
calibrated credible intervals. Our SFHs are in broad agreement with independent
literature measurements The SFHs of galaxies as a function of location in the
$\mathrm{NUV}-r$ versus $r-J$ diagram are in agreement with expectations. We
extract summary statistics to quantify the shape of the SFH, number of peaks,
and formation redshift. The slopes of the SFHs of passive galaxies show only a
weak trend with stellar mass at $z<1.35$ but a significant scatter, indicating
that other factors than mass could drive the suppression of star-formation.
Nevertheless, star-forming galaxies show a clear mass-dependent SFH, with
lower-mass galaxies undergoing more vigorous recent star-formation. Low-mass
galaxies have more peaks in their mass assembly histories than high-mass ones.
At a given mass, we find many different formation redshifts, but for passive
galaxies the mass dependency of formation redshifts is weak. Most passive
galaxies with stellar mass $\log M_*/M_\odot > 9$ had a first event of mass
assembly around $z\sim 3$, independent of mass. This work represents a pilot
study for the future analysis of the \textit{Euclid} Deep fields that will
reach similar depths in alike set of photometric bands, but with over an
order-of-magnitude larger area, opening the possibility of deriving SFHs for
millions of galaxies in a robust manner.},
Year          = {2024},
Month         = {Oct},
Note          = {A&A 699, A328 (2025)},
Url           = {http://arxiv.org/abs/2410.00795v1},
File          = {2410.00795v1.pdf}
}

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