Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-13
Mon.Not.Roy.Astron.Soc.382:1087-1093,2007
Astronomy and Astrophysics
Astrophysics
Minor revisions and expanded discussions. Accepted to MNRAS
Scientific paper
10.1111/j.1365-2966.2007.12090.x
Extended 21cm absorption regions (dubbed ``21cm absorption halos'') around first galaxies at $z\sim 30$ are likely the first distinctive structures accessible to radio observations. Though the radio array capable of detecting and resolving them must have $\sim 200$ km$^2$ total collecting area, given the great impact of such detections to the understanding of the reionization process and cosmology, such radio survey would be extremely profitable. As an example, we point out a potentially useful byproduct of such survey. The resolved 21cm absorption ``halos'', likely close to spherical, can serve as (almost) ideal sources for measuring the {\it cosmic shear} and mapping the matter distribution to $z\sim 30$. We investigate the expected lensing signal and consider a variety of noise contributions on the shear measurement. We find that S/N $\sim 1$ can be achieved for individual ``halos''. Given millions of 21cm absorption ``halos'' across the sky, the total S/N will be comparable to traditional shear measurement of $\sim$$10^9$ galaxies at $z\sim 1$.
Cen Renyue
Zhang Pengjie
Zheng Zheng
No associations
LandOfFree
Lensing of 21cm Absorption "Halos" of $z\sim$20-30 First Galaxies 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 Lensing of 21cm Absorption "Halos" of $z\sim$20-30 First Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lensing of 21cm Absorption "Halos" of $z\sim$20-30 First Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-251900