Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-23
Astrophys.J.624:L65-L68,2005
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures, ApJL, submitted
Scientific paper
10.1086/430599
Fluctuations in the 21cm brightness from cosmic hydrogen at redshifts z > 6 were sourced by the primordial density perturbations from inflation as well as by the radiation from galaxies. We propose a method to separate these components based on the angular dependence of the 21cm fluctuation power spectrum. Peculiar velocities increase the power spectrum by a factor of ~ 2 compared to density fluctuations alone, and introduce an angular dependence in Fourier space. The resulting angular structure relative to the line of sight facilitates a simple separation of the power spectrum into several components, permitting an unambiguous determination of the primordial power spectrum of density fluctuations, and of the detailed properties of all astrophysical sources of 21cm fluctuations. We also demonstrate that there is no significant information to be gained from 21cm measurements on large angular scales. Thus, observational analyses can be confined to small angular areas where projection effects are negligible, and theoretical predictions should focus on the three-dimensional power spectrum of 21cm fluctuations.
Barkana Rennan
Loeb Abraham
No associations
LandOfFree
A Method for Separating the Physics from the Astrophysics of High-Redshift 21cm Fluctuations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Method for Separating the Physics from the Astrophysics of High-Redshift 21cm Fluctuations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Method for Separating the Physics from the Astrophysics of High-Redshift 21cm Fluctuations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-694303