Dark twilight joined with the light of dawn to unveil the reionization history

Paoletti D. Hazra D.K. Finelli F. Smoot G.F.
15 December 2021 American Physical Society

Physical Review D
2021 #104 Issue 12

Improved measurement of the Cosmic Microwave Background (CMB) polarization from Planck allows a detailed study of reionization beyond the average optical depth. The lower value of the optical depth disfavors an early onset and an early completion of reionization in favor of a redshift range where different astrophysical probes provide sensible information on the sources of reionization and the status of the intergalactic medium. In this work we extend our previous study in which we constrained reionization by combining three different probes-CMB, UV luminosity density and neutral hydrogen fraction data [D. K. Hazra, D. Paoletti, F. Finelli, and G. F. Smoot, Phys. Rev. Lett. 125, 071301 (2020)PRLTAO0031-900710.1103/PhysRevLett.125.071301]-in both treatment and data: we first allow variation in the UV source term varying the product of the efficiency of conversion of UV luminosity into ionizing photons and the escape fraction together with the reionization and cosmological parameters, and then we investigate the impact of a less conservative cut for the UV luminosity function. We find that the estimate for the efficiency is consistent within 95% C.L. with the fixed value we considered in our previous results and is mostly constrained by QHII data. We find that allowing the efficiency to vary does not affect significantly our results for the average optical depth for monotonic reionization histories, recovering τ=0.0519-0.0008+0.0010 at 68% C.L., consistent with our previous studies. Using a less conservative cut for the UV luminosity function, we find τ=0.0541-0.0016+0.0013 at 68% C.L., due to the faint end of the luminosity function in the data we use, that also prefers a larger contribution from higher redshifts.

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Inaf Oas Bologna, Osservatorio di Astrofisica e Scienza Dello Spazio di Bologna, via Gobetti 101, Bologna, I-40129, Italy
INFN, Sezione di Bologna, via Irnerio 46, Bologna, 40126, Italy
Institute of Mathematical Sciences, Hbni, Cit Campus, Chennai, 600113, India
Ias Tt and Wf Chao Foundation Professor, IAS, Hong Kong University of Science and Technology, Clear Water Bay Kowloon, Hong Kong, 999077, Hong Kong
Paris Centre for Cosmological Physics, Université de Paris, Emertius, Cnrs, Astroparticule et Cosmologie, Paris, F-75013, France
A, 10 rue Alice Domon et Leonie Duquet, Paris CEDEX 13, 75205, France
Donostia International Physics Center (DIPC), the Basque Country, Donostia, 20018, Spain
Energetic Cosmos Laboratory, Nazarbayev University, 53 Kabanbay Batyr Ave, Nur-Sultan city, Astana, 010000, Kazakhstan

Inaf Oas Bologna
INFN
Institute of Mathematical Sciences
Ias Tt and Wf Chao Foundation Professor
Paris Centre for Cosmological Physics
A, 10 rue Alice Domon et Leonie Duquet, Paris CEDEX 13, 75205, France
Donostia International Physics Center (DIPC)
Energetic Cosmos Laboratory

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