GALAXY FORMATION IN HEAVILY OVERDENSE REGIONS AT z {approx} 10: THE PREVALENCE OF DISKS IN MASSIVE HALOS
Journal Article
·
· Astrophysical Journal Letters
- Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506-0055 (United States)
- Department of Astrophysical and Planetary Sciences, CASA University of Colorado, Boulder, CO 80309 (United States)
Using a high-resolution cosmological numerical simulation, we have analyzed the evolution of galaxies at z {approx} 10 in a highly overdense region of the universe. These objects could represent the high-redshift galaxies recently observed by the Hubble's Wide Field Camera 3 and could as well be possible precursors of QSOs at z {approx} 6-7. To overcome the sampling and resolution problems in cosmological simulations of these rare regions, we have used the constrained realizations method. Our main result for z {approx} 10 shows the high-resolution central region of 3.5 h {sup -1} Mpc radius in comoving coordinates being completely dominated by disk galaxies in the total mass range of {approx}> 10{sup 9} h {sup -1} M{sub sun}. 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 compared to z = 0, and the dark matter halos baryon-rich, by a factor of {approx}2-3 above the average fraction of baryons in the universe. The dominance of disk galaxies in the high-density peaks during the epoch of re-ionization is contrary to the morphology-density trend observed at low redshifts.
- OSTI ID:
- 21562439
- Journal Information:
- Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 2 Vol. 738; ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
Similar Records
THE GENTLE GROWTH OF GALAXIES AT HIGH REDSHIFTS IN OVERDENSE ENVIRONMENTS
Mapping the Most Massive Overdensities through Hydrogen (MAMMOTH). II. Discovery of the Extremely Massive Overdensity BOSS1441 at z = 2.32
THE EVOLUTION OF EARLY- AND LATE-TYPE GALAXIES IN THE COSMIC EVOLUTION SURVEY UP TO z {approx} 1.2
Journal Article
·
Fri Aug 01 00:00:00 EDT 2014
· Astrophysical Journal Letters
·
OSTI ID:22365437
Mapping the Most Massive Overdensities through Hydrogen (MAMMOTH). II. Discovery of the Extremely Massive Overdensity BOSS1441 at z = 2.32
Journal Article
·
Thu Apr 20 00:00:00 EDT 2017
· Astrophysical Journal
·
OSTI ID:22872768
THE EVOLUTION OF EARLY- AND LATE-TYPE GALAXIES IN THE COSMIC EVOLUTION SURVEY UP TO z {approx} 1.2
Journal Article
·
Mon Aug 10 00:00:00 EDT 2009
· Astrophysical Journal
·
OSTI ID:21313651