Reionization and feedback in overdense regions at high redshift
نویسندگان
چکیده
منابع مشابه
Intergalactic baryon-rich regions at high redshift
Using a high resolution cosmological simulation of reionization we have examined the differing structures formed by gas and dark matter at a redshift of 5.1. Baryon-rich regions form a small number of filaments, which connect the largest galaxies in the simulation. More detailed examination of the ten largest galaxies reveals long, slender gaseous filaments about 5 proper kpc in width radiating...
متن کاملGalaxies , Intergalactic Absorption Lines , and Feedback at High Redshift
The galaxy-IGM part of the Lyman-break survey currently consists of measured redshifts for more than 1000 galaxies with redshift 1.5 < ∼ z < ∼ 3.5 along the sightlines to 25 background QSOs. One of the goals of the survey was to measure the influence on the intergalactic medium of energetic feedback from star and black-hole formation. This talk begins with a description of the observed correlat...
متن کاملPhotoionization Feedback in Low–mass Galaxies at High Redshift
The cosmic ultraviolet (UV) ionizing background impacts the formation of dwarf galaxies in the low–redshift universe (z ∼< 3) by suppressing gas infall into galactic halos with circular velocities up to vcirc ∼ 75kms −1. Using a one–dimensional, spherically symmetric hydrodynamics code (Thoul & Weinberg 1995), we examine the effect of an ionizing background on low–mass galaxies forming at high ...
متن کاملReionization Bias in High Redshift Quasar Near-Zones
Absorption spectra of high redshift quasars exhibit an increasingly thick Lyα forest, suggesting the fraction of neutral hydrogen in the intergalactic medium (IGM) is increasing towards z ∼ 6. However, the interpretation of these spectra is complicated by the fact that the Lyα optical depth is already large for neutral hydrogen fractions in excess of 10, and also because quasars are expected to...
متن کاملFossil HII Regions: Self-Limiting Star Formation at High Redshift
Recent results by the WMAP satellite suggest that the intergalactic medium was significantly reionized at redshifts as high as z ∼ 17. At this early epoch, the first ionizing sources likely appeared in the shallow potential wells of mini–halos with virial temperatures Tvir < 10 K. Once such an ionizing source turns off, its surrounding HII region Compton cools and recombines. Nonetheless, we sh...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2011
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2010.18100.x