Probing the intergalactic medium with Lyα and 21 cm fluctuations

• Verfasst von: Heneka, Caroline [VerfasserIn]
• Verfasst von: Cooray, Asantha [VerfasserIn]
• Verfasst von: Feng, Chang [VerfasserIn]
• Titel: Probing the intergalactic medium with Lyα and 21 cm fluctuations
• Verf.angabe: Caroline Heneka, Asantha Cooray, and Chang Feng
• E-Jahr: 2017
• Jahr: 2017 October 11
• Umfang: 22 S.
• Fussnoten: Gesehen am 01.09.2020
• Titel Quelle: Enthalten in: The astrophysical journal / 1
• Ort Quelle: London : Institute of Physics Publ., 1996
• Jahr Quelle: 2017
• Band/Heft Quelle: 848(2017,1) Artikel-Nummer 52, 22 Seiten
• ISSN Quelle: 1538-4357
• DOI: doi:10.3847/1538-4357/aa8eed
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1572646535

Abstract

We study 21 cm and Ly α fluctuations, as well as H α , while distinguishing between Ly α emission of galactic, diffuse, and scattered intergalactic medium (IGM) origin. Cross-correlation information about the state of the IGM is obtained, testing neutral versus ionized medium cases with different tracers in a seminumerical simulation setup. In order to pave the way toward constraints on reionization history and modeling beyond power spectrum information, we explore parameter dependencies of the cross-power signal between 21 cm and Ly α , which displays a characteristic morphology and a turnover from negative to positive correlation at scales of a couple Mpc −1 . In a proof of concept for the extraction of further information on the state of the IGM using different tracers, we demonstrate the use of the 21 cm and H α cross-correlation signal to determine the relative strength of galactic and IGM emission in Ly α . We conclude by showing the detectability of the 21 cm and Ly α cross-correlation signal over more than one decade in scale at high signal-to-noise ratio for upcoming probes like SKA and the proposed all-sky intensity mapping satellites SPHEREx and CDIM, while also including the Ly α damping tail and 21 cm foreground avoidance in the modeling.