Optimal 1D Ly α forest power spectrum estimation – II. KODIAQ, SQUAD,  and XQ-100. Issue 2 (11th November 2021)

• Record Type: Journal Article
• Authors: Karaçaylı, Naim Göksel; Padmanabhan, Nikhil; Font-Ribera, Andreu; Iršič, Vid; Walther, Michael; Brooks, David; Gaztañaga, Enrique; Kehoe, Robert; Levi, Michael; Ntelis, Pierros; Palanque-Delabrouille, Nathalie; Tarlé, Gregory
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 509:Issue 2(2022)
• Page Start: 2842
• Page End: 2855
• Publication Date: 2021-11-11
• Subjects: methods: data analysis -- intergalactic medium -- quasars: absorption lines; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stab3201
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We measure the 1D Ly α power spectrum P 1D from Keck Observatory Database of Ionized Absorption toward Quasars (KODIAQ), The Spectral Quasar Absorption Database (SQUAD), and XQ-100 quasars using the optimal quadratic estimator. We combine KODIAQ and SQUAD at the spectrum level, but perform a separate XQ-100 estimation to control its large resolution corrections in check. Our final analysis measures P 1D at scales k < 0.1 s km −1 between redshifts $z$ = 2.0–4.6 using 538 quasars. This sample provides the largest number of high-resolution, high-S/N observations; and combined with the power of optimal estimator it provides exceptional precision at small scales. These small-scale modes ( k ≳ 0.02 s km −1 ), unavailable in Sloan Digital Sky Survey and Dark Energy Spectroscopic Instrument analyses, are sensitive to the thermal state and reionization history of the intergalactic medium, as well as the nature of dark matter. As an example, a simple Fisher forecast analysis estimates that our results can improve small-scale cut-off sensitivity by more than a factor of 2.