Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-03-24
Phys.Rev.Lett.103:091304,2009
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
5 pages, 4 figures, matches published version
Scientific paper
10.1103/PhysRevLett.103.091304
We present a theoretical estimate for a new observable: the cross-correlation between the Lyman-alpha flux fluctuations in quasar (QSO) spectra and the convergence of the cosmic microwave background (CMB) as measured along the same line-of-sight. As a first step toward the assessment of its detectability, we estimate the signal-to-noise ratio using linear theory. Although the signal-to-noise is small for a single line-of-sight and peaks at somewhat smaller redshifts than those probed by the Lyman-alpha forest, we estimate a total signal-to-noise of 9 for cross-correlating QSO spectra of SDSS-III with Planck and of 20 for cross-correlating with a future polarization based CMB experiment. The detection of this effect would be a direct measure of the neutral hydrogen-matter cross-correlation and could provide important information on the growth of structures at large scales in a redshift range which is still poorly probed by observations.
Das Sudeep
Spergel David N.
Vallinotto Alberto
Viel Matteo
No associations
LandOfFree
Lenses in the forest: cross-correlation of the Lyman-alpha flux with CMB lensing 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 Lenses in the forest: cross-correlation of the Lyman-alpha flux with CMB lensing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lenses in the forest: cross-correlation of the Lyman-alpha flux with CMB lensing will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-67372