Detecting Early Galaxies Through Their 21-cm Signature

Details Detecting Early Galaxies Through Their 21-cm Signature Detecting Early Galaxies Through Their 21-cm Signature

2007-07-20

arxiv.org/abs/0707.3146v2

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, submitted to MNRAS Lett

Scientific paper

10.1111/j.1745-3933.2008.00434.x

New observations over the next few years of the emission of distant objects will help unfold the chapter in cosmic history around the era of the first galaxies. These observations will use the neutral hydrogen emission or absorption at a wavelength of 21-cm as a detector of the hydrogen abundance. We predict the signature on the 21-cm signal of the early generations of galaxies. We calculate the 21-cm power spectrum including two physical effects that were neglected in previous calculations. The first is the redistribution of the UV photons from the first galaxies due to their scattering off of the neutral hydrogen, which results in an enhancement of the 21-cm signal. The second is the presence of an ionized hydrogen bubble near each source, which produces a cutoff at observable scales. We show that the resulting clear signature in the 21-cm power spectrum can be used to detect and study the population of galaxies that formed just 200 million years after the Big Bang.

Affiliated with

Also associated with

No associations

Rating

Detecting Early Galaxies Through Their 21-cm Signature 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 Detecting Early Galaxies Through Their 21-cm Signature, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detecting Early Galaxies Through Their 21-cm Signature will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-59038