The UchuuSDSS galaxy lightcones: a clustering, RSD and BAO study
Abstract
We present the data release of the UchuuSDSS galaxies: a set of 32 highfidelity galaxy lightcones constructed from the large Uchuu 2.1 trillion particle $N$body simulation using Planck cosmology. We adopt subhalo abundance matching to populate the Uchuubox halo catalogues with SDSS galaxy luminosities. These cubic box galaxy catalogues generated at several redshifts are combined to create the set of lightcones with redshiftevolving galaxy properties. The UchuuSDSS galaxy lightcones are built to reproduce the footprint and statistical properties of the SDSS main galaxy survey, along with stellar masses and star formation rates. This facilitates direct comparison of the observed SDSS and simulated UchuuSDSS data. Our lightcones reproduce a large number of observational results, such as the distribution of galaxy properties, the galaxy clustering, the stellar mass functions, and the halo occupation distributions. Using the simulated and real data we select samples of bright red galaxies at $z_\mathrm{eff}=0.15$ to explore Redshift Space Distortions and Baryon Acoustic Oscillations (BAO) utilizing a fullshape analytical model of the twopoint correlation function. We create a set of 5100 galaxy lightcones using GLAM Nbody simulations to compute covariance errors. We report a $\sim 30\%$ precision increase on $f\sigma_8$, due to our better estimate of the covariance matrix. From our BAOinferred $\alpha_{\parallel}$ and $\alpha_{\perp}$ parameters, we obtain the first SDSS measurements of the Hubble and angular diameter distances $D_\mathrm{H}(z=0.15) / r_d = 27.9^{+3.1}_{2.7}$, $D_\mathrm{M}(z=0.15) / r_d = 5.1^{+0.4}_{0.4}$. Overall, we conclude that the Planck LCDM cosmology nicely explains the observed largescale structure statistics of SDSS. All data sets are made publicly available.
 Publication:

arXiv eprints
 Pub Date:
 July 2022
 arXiv:
 arXiv:2208.00540
 Bibcode:
 2022arXiv220800540D
 Keywords:

 Astrophysics  Cosmology and Nongalactic Astrophysics;
 Astrophysics  Astrophysics of Galaxies
 EPrint:
 20 Pages, Submitted to MNRAS