2023/11/07 by Gerrit S. Farren, Farren, Gerrit S., Blake D. Sherwin +9 · 2 citations
Computer Science · Economics, Econometrics and Finance · Engineering · #Blind Source Separation Techniques #Control Systems and Identification #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Monetary Policy and Economic Impact
paper · pdf · doi:10.48550/arxiv.2311.04213
openalex publication_date 2023/11/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
We present a first measurement of the galaxy-galaxy-CMB lensing bispectrum. The signal is detected at 26σ and 22σ significance using two samples from the unWISE galaxy catalog at mean redshifts z=0.6 and 1.1 and lensing reconstructions from Planck PR4. We employ a compressed bispectrum estimator based on the cross-correlation between the square of the galaxy overdensity field and CMB lensing reconstructions. We present a series of consistency tests to ensure the cosmological origin of our signal and rule out potential foreground contamination. We compare our results to model predictions from a halo model previously fit to only two-point spectra, finding reasonable agreement when restricting our analysis to large scales. Such measurements of the CMB lensing galaxy bispectrum will have several important cosmological applications, including constraining the uncertain higher-order bias parameters that currently limit lensing cross-correlation analyses.