The impact of the supersonic baryon-dark matter velocity difference on the z~20 21cm background

Details The impact of the supersonic baryon-dark matter velocity difference on the z~20 21cm background The impact of the supersonic baryon-dark matter velocity difference on the z~20 21cm background

2012-04-05

arxiv.org/abs/1204.1345v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

to be submitted to ApJ; for movies see http://astro.berkeley.edu/~mmcquinn/firstlight

Scientific paper

Recently, Tseliakhovich and Hirata (2010) showed that during the cosmic Dark Ages the baryons were typically moving supersonically with respect to the dark matter with a spatially variable Mach number. Such supersonic motion may source shocks that heat the Universe. This motion may also suppress star formation in the first halos. Even a small amount of coupling of the 21cm signal to this motion has the potential to vastly enhance the 21cm brightness temperature fluctuations at 15

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