The Galaxy Luminosity Functions in ASTRID: Predictions for LSST
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866909040643145728 |
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| author | Hafezianzadeh, Fatemeh Zhang, Tianqing Rogozenski, Paul Lachance, Patrick Zhou, Yihao Di Matteo, Tiziana Croft, Rupert A. C. Bird, Simeon Mandelbaum, Rachel |
| author_facet | Hafezianzadeh, Fatemeh Zhang, Tianqing Rogozenski, Paul Lachance, Patrick Zhou, Yihao Di Matteo, Tiziana Croft, Rupert A. C. Bird, Simeon Mandelbaum, Rachel |
| contents | We present validated and forward-modelled 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 are computed by combining stellar population synthesis modeling with a physically motivated dust attenuation prescription in which the optical depth scales with metal surface density. The dust model is calibrated at z = 0 using SDSS luminosity functions and tested at intermediate redshifts (z = 0.5, 1.0, and 1.5) in rest-frame B, V , R, and I bands. We find that the attenuated luminosity functions reproduce observed galaxy statistics across multiple wavelengths and redshifts. Using this calibrated framework, we construct LSST-ready mock photometric catalogs over 0 <= z <= 2 in steps of Delta z = 0.1, containing ~378 million galaxies. We provide predicted apparent-magnitude luminosity functions in the LSST ugrizy bands, derive best-fit Schechter parameters as a compact analytic representation, and compute differential and cumulative galaxy number counts as a function of survey depth from Year 1 to Year 10. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_13843 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The Galaxy Luminosity Functions in ASTRID: Predictions for LSST Hafezianzadeh, Fatemeh Zhang, Tianqing Rogozenski, Paul Lachance, Patrick Zhou, Yihao Di Matteo, Tiziana Croft, Rupert A. C. Bird, Simeon Mandelbaum, Rachel Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We present validated and forward-modelled 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 are computed by combining stellar population synthesis modeling with a physically motivated dust attenuation prescription in which the optical depth scales with metal surface density. The dust model is calibrated at z = 0 using SDSS luminosity functions and tested at intermediate redshifts (z = 0.5, 1.0, and 1.5) in rest-frame B, V , R, and I bands. We find that the attenuated luminosity functions reproduce observed galaxy statistics across multiple wavelengths and redshifts. Using this calibrated framework, we construct LSST-ready mock photometric catalogs over 0 <= z <= 2 in steps of Delta z = 0.1, containing ~378 million galaxies. We provide predicted apparent-magnitude luminosity functions in the LSST ugrizy bands, derive best-fit Schechter parameters as a compact analytic representation, and compute differential and cumulative galaxy number counts as a function of survey depth from Year 1 to Year 10. |
| title | The Galaxy Luminosity Functions in ASTRID: Predictions for LSST |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2605.13843 |