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Evidence for baryon acoustic oscillations from galaxy-ellipticity correlations
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abstract
The Baryon Acoustic Oscillations (BAO) feature in the clustering of galaxies or quasars provides a ``standard ruler" for distance measurements in cosmology. In this work, we report a $2\sim3\sigma$ signal of the BAO dip feature in the galaxy density-ellipticity (GI) cross-correlation functions using the spectroscopic sample of the Baryon Oscillation Spectroscopic Survey (BOSS) CMASS, combined with the deep DESI Legacy Imaging Surveys for precise galaxy shape measurements. We measure the GI correlation functions and model them using the linear alignment model. We constrain the distance $D_V/r_{\mathrm{d}}$ to redshift $0.57$ to a precision of $3\sim5\%$, depending on the details of modeling. The GI measurement reduces the uncertainty of distance measurement by $\sim10\%$ on top of that derived from the galaxy-galaxy (GG) correlation. More importantly, for future large and deep galaxy surveys, the independent GI measurements can help sort out the systematics in the BAO studies.
Forward citations
Cited by 4 Pith papers
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Artifacts in Halo Shapes: Imprints of the Initial Condition
Grid-based initial conditions imprint roughly one-percent alignment artifacts on simulated halo shapes, with a redshift-dependent sign flip whose origin is not yet pinned down.
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Evidence for Intrinsic Galaxy Alignments in Ellipticity Autocorrelations out to $100 h^{-1}\textrm{Mpc}$ from SDSS Galaxies with DESI Imaging
Galaxy ellipticity autocorrelations are detected out to 100 h^-1 Mpc in three SDSS/BOSS samples, the first detection at these scales.
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SHAPE: cosmology with cluster halo intrinsic alignments from subhalo distributions
Cluster shapes reconstructed from subhalo positions yield intrinsic alignment correlations that trace the cosmic web, but the claimed unbiased recovery of the growth rate is not supported by all three simulation realizations.
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Improving cosmological constraints via galaxy intrinsic alignment in full-shape analysis
A Fisher forecast shows that adding full-shape intrinsic alignment information to galaxy clustering tightens cosmological constraints, particularly for dark energy and non-flat modified-gravity models.
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