학술논문
CMB lensing and Ly\alpha\ forest cross bispectrum from DESI's first-year quasar sample
Document Type
Working Paper
Author
Karaçaylı, N. G.; Martini, P.; Weinberg, D. H.; Ferraro, S.; de Belsunce, R.; Aguilar, J.; Ahlen, S.; Armengaud, E.; Brooks, D.; Claybaugh, T.; de la Macorra, A.; Dey, B.; Doel, P.; Fanning, K.; Forero-Romero, J. E.; Gontcho, S. Gontcho A; Gonzalez-Morales, A. X.; Gutierrez, G.; Guy, J.; Honscheid, K.; Kirkby, D.; Kisner, T.; Kremin, A.; Lambert, A.; Landriau, M.; Guillou, L. Le; Levi, M. E.; Manera, M.; Meisner, A.; Miquel, R.; Mueller, E.; Muñoz-Gutiérrez, A.; Myers, A. D.; Newman, J. A.; Nie, J.; Niz, G.; Palanque-Delabrouille, N.; Percival, W. J.; Poppett, C.; Prada, F.; Ravoux, C.; Rezaie, M.; Ross, A. J.; Rossi, G.; Sanchez, E.; Schlafly, E. F.; Schlegel, D.; Seo, H.; Sprayberry, D.; Tan, T.; Tarlé, G.; Weaver, B. A.; Zou, H.
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Subject
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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.
Comment: 13 pages excluding references, 8 figures
Comment: 13 pages excluding references, 8 figures