Galaxy Formation in Heavily Overdense Regions at z~10: the Prevalence of Disks in Massive Halos

Details Galaxy Formation in Heavily Overdense Regions at z~10: the Prevalence of Disks in Massive Halos Galaxy Formation in Heavily Overdense Regions at z~10: the Prevalence of Disks in Massive Halos

2011-06-06

arxiv.org/abs/1106.1214v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

To be published by the Astrophysical Journal Letters, 5 pages, 3 figures. Small corrections following the referee report

Scientific paper

Using a high-resolution cosmological numerical simulation, we have analyzed the evolution of galaxies at z~10 in a highly overdense region of the universe. These objects could represent the high redshift galaxies recently observed by the Hubble's WFC3, and be as well possible precursors of QSOs at z~6-7. To overcome the sampling and resolution problems in cosmological simulations, we have used the Constrained Realizations method. Our main result for z~10 shows the region of 3.5h^{-1}Mpc radius in comoving coordinates completely dominated by disk galaxies in the total mass range of >=10^9h^{-1}Mo. We have verified that the gaseous and stellar disks we identify are robust morphological features, capable of surviving the ongoing merger process at these redshifts. Below this mass range, we find a sharp decline in the disk fraction to negligible numbers. At this redshift, the disks appear to be gas-rich and the dark matter halos baryon-rich, by a factor of ~2-3 above the average fraction of baryons in the universe. The prevalence of disk galaxies in the high density peaks during the epoch of reionization is contrary to the morphology-density trend observed at low redshifts.

Affiliated with

Also associated with

No associations

Rating

Galaxy Formation in Heavily Overdense Regions at z~10: the Prevalence of Disks in Massive Halos 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 Galaxy Formation in Heavily Overdense Regions at z~10: the Prevalence of Disks in Massive Halos, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Galaxy Formation in Heavily Overdense Regions at z~10: the Prevalence of Disks in Massive Halos will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-25162