Smooth Boundaries to Cosmological HII Regions from Galaxy Clustering

Details Smooth Boundaries to Cosmological HII Regions from Galaxy Clustering Smooth Boundaries to Cosmological HII Regions from Galaxy Clustering

2006-07-12

arxiv.org/abs/astro-ph/0607246v1

Astronomy and Astrophysics

Astrophysics

5 Pages, 3 figures. Submitted to MNRAS

Scientific paper

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.

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