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Large-scale BAO signatures of the smallest galaxies

Large-scale BAO signatures of the smallest galaxies
Dalal N.Pen U.-L.Seljak U.
Ewha Authors
Uros Seljak
Issue Date
Journal Title
Journal of Cosmology and Astroparticle Physics
1475-7516JCR Link
Journal of Cosmology and Astroparticle Physics vol. 2010, no. 11
Document Type
Recent work has shown that at high redshift, the relative velocity between dark matter and baryonic gas is typically supersonic. This relative velocity suppresses the formation of the earliest baryonic structures like minihalos, and the suppression is modulated on large scales. This effect imprints a characteristic shape in the clustering power spectrum of the earliest structures, with significant power on ∼100 Mpc scales featuring highly pronounced baryon acoustic oscillations. The amplitude of these oscillations is orders of magnitude larger at z ∼ 20 than previously expected. This characteristic signature can allow us to distinguish the effects of minihalos on intergalactic gas at times preceding and during reionization. We illustrate this effect with the example of 21 cm emission and absorption from redshifts during and before reionization. This effect can potentially allow us to probe physics on kpc scales using observations on 100 Mpc scales. We present sensitivity forecasts for FAST and Arecibo. Depending on parameters, this enhanced structure may be detectable by Arecibo at z ∼ 15-20, and with appropriate instrumentation FAST could measure the BAO power spectrum with high precision. In principle, this effect could also pose a serious challenge for efforts to constrain dark energy using observations of the BAO feature at low redshift. © 2010 IOP Publishing Ltd and SISSA.
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자연과학대학 > 물리학전공 > Journal papers
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