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Peer-reviewedCC BY 4.0The Astrophysical Journal

The Galaxy Luminosity Functions in ASTRID: Predictions for LSST

  • Fatemeh Hafezianzadeh1
  • Tianqing Zhang2
  • Paul Rogozenski1
  • Patrick Lachance1
  • Yihao Zhou1
  • Tiziana Di Matteo1
  • Rupert A. C. Croft1
  • Simeon Bird3
  • Rachel Mandelbaum1
  1. 1Carnegie Mellon University
  2. 2University of Pittsburgh
  3. 3University of California Riverside
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Abstract

We present galaxy luminosity functions and photometric predictions for the Vera C. Rubin Observatory Legacy Survey of Space and Time using the ASTRID cosmological hydrodynamical simulation. Galaxy magnitudes combine stellar population synthesis with a dust attenuation model whose optical depth scales with metal surface density. We calibrate the dust model at z = 0 using SDSS luminosity functions and test it at z = 0.5, 1.0, and 1.5 in rest frame B , V , R , I bands, finding good agreement with observations. We then construct LSST ready mock photometric catalogs over 0 ≤ z ≤ 2 in steps of Δ z = 0.1, containing about 378 million galaxies, including about 47 million above the LSST Year 10 coadded i -band limit. We provide apparent magnitude luminosity functions in ugrizy , best-fit Schechter parameters, and differential and cumulative galaxy counts as a function of survey depth.

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Cite

BibTeXRIS
BibTeX
@article{hafezianzadeh2026galaxy,
  title = {{The Galaxy Luminosity Functions in ASTRID: Predictions for LSST}},
  author = {Fatemeh Hafezianzadeh and Tianqing Zhang and Paul Rogozenski and Patrick Lachance and Yihao Zhou and Tiziana Di Matteo and Rupert A. C. Croft and Simeon Bird and Rachel Mandelbaum},
  journal = {The Astrophysical Journal},
  year = {2026},
  month = oct,
  doi = {10.3847/1538-4357/aea57a},
  url = {https://iopscience.iop.org/article/10.3847/1538-4357/aea57a},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - The Galaxy Luminosity Functions in ASTRID: Predictions for LSST
AU  - Fatemeh Hafezianzadeh
AU  - Tianqing Zhang
AU  - Paul Rogozenski
AU  - Patrick Lachance
AU  - Yihao Zhou
AU  - Tiziana Di Matteo
AU  - Rupert A. C. Croft
AU  - Simeon Bird
AU  - Rachel Mandelbaum
PY  - 2026
DA  - 2026/10/08
JO  - The Astrophysical Journal
DO  - 10.3847/1538-4357/aea57a
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/aea57a
AB  - We present galaxy luminosity functions and photometric predictions for the Vera C. Rubin Observatory Legacy Survey of Space and Time using the ASTRID cosmological hydrodynamical simulation. Galaxy magnitudes combine stellar population synthesis with a dust attenuation model whose optical depth scales with metal surface density. We calibrate the dust model at z = 0 using SDSS luminosity functions and test it at z = 0.5, 1.0, and 1.5 in rest frame B , V , R , I bands, finding good agreement with observations. We then construct LSST ready mock photometric catalogs over 0 ≤ z ≤ 2 in steps of Δ z = 0.1, containing about 378 million galaxies, including about 47 million above the LSST Year 10 coadded i -band limit. We provide apparent magnitude luminosity functions in ugrizy , best-fit Schechter parameters, and differential and cumulative galaxy counts as a function of survey depth.
SN  - 0004-637X
SN  - 1538-4357
ER  -