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Optimal 1D Ly α forest power spectrum estimation – II. KODIAQ, SQUAD, and XQ-100

Karaçaylı, NG; Padmanabhan, N; Font-Ribera, A; Iršič, V; Walther, M; Brooks, D; Gaztañaga, E; ... Tarlé, G; + view all (2022) Optimal 1D Ly α forest power spectrum estimation – II. KODIAQ, SQUAD, and XQ-100. Monthly Notices of the Royal Astronomical Society , 509 (2) pp. 2842-2855. 10.1093/mnras/stab3201. Green open access

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Abstract

We measure the 1D Ly α power spectrum P1D 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 P1D 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.

Type: Article
Title: Optimal 1D Ly α forest power spectrum estimation – II. KODIAQ, SQUAD, and XQ-100
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stab3201
Publisher version: https://doi.org/10.1093/mnras/stab3201
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Methods: data analysis, intergalactic medium, quasars: absorption lines
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10138939
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