We measure the intrinsic alignment (IA) of galaxy multiplets with the large-scale tidal field traced by galaxy positions in DESI Data Release 2. Using the BGS, LRG, and ELG samples spanning $0.01<z<1.6$, we optimize the scales which define multiplets in each sample to minimize measurement noise. We measure multiplet tidal alignment $\mathcal{E}_+$ on scales beyond 100 $h^{-1}$Mpc in all samples, and detect alignment over 200 $h^{-1}$Mpc, up to 4.5$\sigma$ in the highest LRG redshift bin. We additionally present the multiplet shape-shape autocorrelation, $\mathcal{E}_{++}$, which is independent of galaxy bias and provides a consistency check of our NLA (nonlinear alignment) model. We do not detect a baryon acoustic feature in the projected estimator. We also find the alignment strength of multiplets is correlated with redshift and galaxy morphology. Multiplet alignment offers direct access to the tidal shear field in all galaxy samples, even where individual galaxy alignment cannot, and extends IA detection to the largest scales yet probed.
We present measurements of the scale of cosmic homogeneity using the first data release (DR1) of the Dark Energy Spectroscopic Instrument (DESI), the largest publicly available spectroscopic extragalactic survey to date. Using a counts-in-spheres estimator applied to nearly 5 million galaxies and quasars across six ind...
C. Howlett, L. Giani, Elizabeth G. O'Brien et al.· 0 citations
The clustering of matter in the universe is quantified by $\sigma_8$, the RMS fluctuations today in linear theory in spheres of radius $8h^{-1}$ Mpc, where $h$ parametrizes the Hubble constant. Surveys of gravitational lensing and galaxy clustering best constrain $S_8\equiv (\Omega_m/0.3)^{0.5} \sigma_8$, where $\Omega...
Joanne Jones, Ualype de Andrade Uchôa, S. Dodelson· 0 citations
We present the angular BAO analysis using DESI DR1 data as a complementary approach to DESI's primary 3D BAO analysis. We perform the analysis using the two-point angular correlation function $w(\theta)$ in tomographic redshift shells of $\delta z = 0.02, 0.05$, spanning the redshift range $0.4<z<2.1$ using the DESI tr...
Anya Paopiamsap, J. Mena-Fernández, H. Gil-Marín et al.· 0 citations
We present the first dark matter density profile derived directly from James Webb Space Telescope JADES Data Release~3 NIRSpec observations of $N = 587$ galaxies spanning the cosmic noon epoch $1.5 \leq z \leq 3.5$. From each NIRSpec G235M/G395M spectrum we extract the H$\alpha$ emission-line velocity dispersion $\sigm...
Small-scale galaxy-galaxy weak lensing provides an independent way to probe the stellar initial mass function by constraining the matter distribution within galaxies. We forecast the potential of upcoming \textit{Euclid} observations using realistic mock catalogues designed for a DESI-like Bright Galaxy Survey, which i...
D. Rana, H. Hoekstra, K. Kuijken et al.· 0 citations
Motivated by curiosity as to whether the observed Universe at low redshifts is well described by the concordance cosmological model, we investigate the large scale angular clustering of extragalactic neutral hydrogen HI sources in the local Universe. Using the second data release of the FAST All Sky HI Survey (FASHI),...
F. Avila, C. Franco, A. Bernui· 0 citations
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