Smooth Boundaries to Cosmological HII Regions from Galaxy Clustering
Astrophysics
2015-06-24 v1
Abstract
The HII regions around quasars and galaxies at redshifts beyond the epoch of reionisation will provide prime targets for upcoming 21cm campaigns using a new generation of low-frequency radio observatories. Here we show that the boundaries of these HII regions will not be sharp. Rather, the clustering of sources near massive galaxies results in a neutral fraction that rises gradually towards large radii from an interior value near zero. A neutral fraction corresponding to the global background value is typically reached at a distance of 2-5 times the radius of the HII region around the central massive galaxy.
Cite
@article{arxiv.astro-ph/0607246,
title = {Smooth Boundaries to Cosmological HII Regions from Galaxy Clustering},
author = {Stuart Wyithe and Abraham Loeb},
journal= {arXiv preprint arXiv:astro-ph/0607246},
year = {2015}
}
Comments
5 Pages, 3 figures. Submitted to MNRAS