Robust velocity-induced acoustic oscillations at cosmic dawn

Muñoz, Julian B.

doi:10.1103/physrevd.100.063538

Title: Robust velocity-induced acoustic oscillations at cosmic dawn

Journal Article · Thu Sep 26 00:00:00 EDT 2019 · Physical Review D

DOI:https://doi.org/10.1103/physrevd.100.063538· OSTI ID:1613059

^[1]

Harvard Univ., Cambridge, MA (United States)

The redshifted 21-cm line of hydrogen holds great potential for the study of cosmology, as it can probe otherwise unobservable cosmic epochs. In particular, measurements of the 21-cm power spectrum during cosmic dawn—the era when the first stars were formed—will provide us with a wealth of information about the astrophysics of stellar formation, as well as the origin of fluctuations intn our Universe. In addition to their usually considered density fluctuations, dark matter and baryons possess large relative velocities with respect to each other, due to the baryon acoustic oscillations suffered by the latter, which suppress the formation of stars during cosmic dawn, leaving an imprint on 21-cm observables during this era. Here we present 21cmvfast, a version of the publicly available code 21cmvfast modified to account for this effect. Previous work has shown that the inclusion of relative velocities produces an acoustic modulation on the large-scale 21-cm power spectrum during cosmic dawn. By comparing analytic calculations with simulations from 21cmvfast, here we demonstrate that this modulation takes the form of robust velocity-induced acoustic oscillations (VAOs), during both the Lyman-α coupling era and the subsequent epoch of heating. The unique shape of these VAOs, which is determined by the acoustic physics that generated the relative velocities, can be analytically computed and is easily distinguishable from the usual density-sourced fluctuations. Here, we find that, under a broad range of astrophysical assumptions, the VAOs are detectable at high significance by the upcoming HERA interferometer, which could therefore confirm the presence of acoustic oscillations at cosmic dawn.

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Research Organization:: Harvard Univ., Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0019018

OSTI ID:: 1613059

Alternate ID(s):: OSTI ID: 1566930

Journal Information:: Physical Review D, Vol. 100, Issue 6; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 28 works

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21-cm Fluctuations from Charged Dark Matter Muñoz, Julian B.; Dvorkin, Cora; Loeb, Abraham arXiv https://doi.org/10.48550/arxiv.1804.01092	text	January 2018
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The Growth of HII Regions During Reionization Furlanetto, Steven; Zaldarriaga, Matias; Hernquist, Lars arXiv https://doi.org/10.48550/arxiv.astro-ph/0403697	text	January 2004
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Separating out the Alcock-Paczynski Effect on 21cm Fluctuations Barkana, Rennan arXiv https://doi.org/10.48550/arxiv.astro-ph/0508341	text	January 2005
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Was Star-Formation Suppressed in High-Redshift Minihalos? Haiman, Zoltan; Bryan, Greg L. arXiv https://doi.org/10.48550/arxiv.astro-ph/0603541	text	January 2006
The First Stars in The Universe Naoz, Smadar; Noter, Shay; Barkana, Rennan arXiv https://doi.org/10.48550/arxiv.astro-ph/0604050	text	January 2006
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The halo mass function from the dark ages through the present day Reed, Darren; Bower, Richard; Frenk, Carlos arXiv https://doi.org/10.48550/arxiv.astro-ph/0607150	text	January 2006
Does Radiative Feedback by the First Stars Promote or Prevent Second Generation Star Formation? Ahn, Kyungjin; Shapiro, Paul R. arXiv https://doi.org/10.48550/arxiv.astro-ph/0607642	text	January 2006
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