Measuring the distance-redshift relation with the baryon acoustic oscillations of galaxy clusters

TL;DR

This paper uses galaxy cluster data from SDSS to measure baryon acoustic oscillations and constrain the distance-redshift relation, providing new observational insights consistent with the standard cosmological model.

Contribution

First to constrain the distance-redshift relation solely using BAO peaks from galaxy clusters across multiple redshifts.

Findings

Detected BAO peaks in all three cluster samples.

Derived precise measurements of the distance ratio r_s/D_V at three redshifts.

Provided cosmological parameter constraints consistent with ΛCDM.

Abstract

We analyse the largest spectroscopic samples of galaxy clusters to date, and provide observational constraints on the distance-redshift relation from baryon acoustic oscillations. The cluster samples considered in this work have been extracted from the Sloan Digital Sky Survey at three median redshifts, $z=0.2$, $z=0.3$, and $z=0.5$. The number of objects is $12910$, $42215$, and $11816$, respectively. We detect the peak of baryon acoustic oscillations for all the three samples. The derived distance constraints are: $r_s/D_V(z=0.2)=0.18 \pm 0.01$, $r_s/D_V(z=0.3)=0.124 \pm 0.004$ and $r_s/D_V(z=0.5)=0.080 \pm 0.002$. Combining these measurements, we obtain robust constraints on cosmological parameters. Our results are in agreement with the standard $\Lambda$ cold dark matter model. Specifically, we constrain the Hubble constant in a $\Lambda$CDM model, $H_0 = 64_{-9}^{+14} \, \mathrm{km} \, \mathrm{s}^{-1}\mathrm{Mpc}^{-1}$, the density of curvature energy, in the $o\Lambda$CDM context, $\Omega_K = -0.015_{-0.36}^{+0.34}$, and finally the parameter of the dark energy equation of state in the $ow$CDM case, $w = -1.01_{-0.44}^{+0.44}$. This is the first time the distance-redshift relation has been constrained using only the peak of baryon acoustic oscillations of galaxy clusters.