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CMB lensing and Ly\alpha\ forest cross bispectrum from DESI's first-year quasar sample

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arxiv 2405.14988 v1 pith:555WVGBN submitted 2024-05-23 astro-ph.CO

N. G. Karaçayl{i} , P. Martini , D. H. Weinberg , S. Ferraro , R. de Belsunce , J. Aguilar , S. Ahlen , E. Armengaud
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D. Brooks T. Claybaugh A. de la Macorra B. Dey P. Doel K. Fanning J. E. Forero-Romero S. Gontcho A Gontcho A. X. Gonzalez-Morales G. Gutierrez J. Guy K. Honscheid D. Kirkby T. Kisner A. Kremin A. Lambert M. Landriau L. Le Guillou M. E. Levi M. Manera A. Meisner R. Miquel E. Mueller A. Muñoz-Gutiérrez A. D. Myers J. A. Newman J. Nie G. Niz N. Palanque-Delabrouille W. J. Percival C. Poppett F. Prada C. Ravoux M. Rezaie A. J. Ross G. Rossi E. Sanchez E. F. Schlafly D. Schlegel H. Seo D. Sprayberry T. Tan G. Tarlé B. A. Weaver H. Zou
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keywords lensingbispeconedfirst-yearforestmeasurementparametersquasarsigma
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abstract

The squeezed cross-bispectrum \bispeconed\ between the gravitational lensing in the Cosmic Microwave Background and the 1D \lya\ forest power spectrum can constrain bias parameters and break degeneracies between $\sigma_8$ and other cosmological parameters. We detect \bispeconed\ with $4.8\sigma$ significance at an effective redshift $z_\mathrm{eff}=2.4$ using Planck PR3 lensing map and over 280,000 quasar spectra from the Dark Energy Spectroscopic Instrument's first-year data. We test our measurement against metal contamination and foregrounds such as Galactic extinction and clusters of galaxies by deprojecting the thermal Sunyaev-Zeldovich effect. We compare our results to a tree-level perturbation theory calculation and find reasonable agreement between the model and measurement.

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Cited by 3 Pith papers

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    astro-ph.CO 2025-06 unverdicted novelty 6.0 of 10

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