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Lyalpha versus X-ray heating in the high-z IGM
Benedetta Ciardi, Ruben Salvaterra, Tiziana Di Matteo
In this paper we examine the effect of X-ray and Lyalpha photons on the intergalactic medium temperature. We calculate the photon production from a population of stars and micro-qu…
The onset of star formation in primordial haloes
Umberto Maio, Benedetta Ciardi, Naoki Yoshida +2
Star formation remains an unsolved problem in astrophysics. Numerical studies of large-scale structure simulations cannot resolve the whole process and their approach usually assum…
The contribution of the IGM and minihalos to the 21 cm signal of reionization
Bin Yue, Benedetta Ciardi, Evan Scannapieco +1
We study the statistical properties of the cosmological 21 cm signal from both the intergalactic medium (IGM) and minihalos, using a reionization simulation that includes a self--c…
Probing intergalactic radiation fields during cosmic reionization through gamma-ray absorption
Susumu Inoue, Ruben Salvaterra, Tirthankar Roy Choudhury +3
We discuss expectations for the absorption of high-energy gamma-rays by gamma-gamma pair production with intergalactic radiation fields (IRFs) at very high redshifts (z~5-20), and…
Foregrounds for observations of the cosmological 21 cm line: I. First Westerbork measurements of Galactic emission at 150 MHz in a low latitude field
G. Bernardi, A. G. de Bruyn, M. A. Brentjens +11
We present the first results from a series of observations conducted with the Westerbork telescope in the 140--160 MHz range with a 2 arcmin resolution aimed at characterizing the…
Non-parametric foreground subtraction for 21cm epoch of reionization experiments
Geraint Harker, Saleem Zaroubi, Gianni Bernardi +12
An obstacle to the detection of redshifted 21cm emission from the epoch of reionization (EoR) is the presence of foregrounds which exceed the cosmological signal in intensity by or…
The LOFAR EoR Data Model: (I) Effects of Noise and Instrumental Corruptions on the 21-cm Reionization Signal-Extraction Strategy
Panagiotis Labropoulos, Leon V. E. Koopmans, Vibor Jelic +11
A number of experiments are set to measure the 21-cm signal of neutral hydrogen from the Epoch of Reionization (EoR). The common denominator of these experiments are the large data…