出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Recently, R. Cen (2006) has suggested that small protogalactic halos at high redshift (z ' 20−
25) could be surrounded by extended (r 1h−1Mpc) gaseous halos, which could be marginally
detected by LOFAR. However, more recent work on the mass function at high z shows that these
estimates could be too optimistic. Moreover, the variance over the sky of this signal could be very
large, thus undermining the practical usage of these halos for the determination of cosmological
parameters using weak lensing.
