منابع مشابه
The 21 cm Forest: Radio Absorption Spectra as a Probe of the Intergalactic Medium Before Reionization
We study the absorption along lines of sight toward high-z radio sources caused by the 21 cm transition of neutral hydrogen in the intergalactic medium (IGM) before reionization. Using semi-analytic methods, we compute the number density of observable features caused by both “minihalos” (bound objects that are unable to cool efficiently because of their small virial temperatures) and protogalac...
متن کاملProspects for detecting the 21 cm forest from the diffuse intergalactic medium with LOFAR
We discuss the feasibility of the detection of the 21 cm forest in the diffuse intergalactic medium (IGM) with the radio telescope LOFAR. The optical depth to the 21 cm line has been derived using simulations of reionization which include detailed radiative transfer of ionizing photons. We find that the spectra from reionization models with similar total comoving hydrogen ionizing emissivity bu...
متن کاملThe 21 cm Forest: Radio Absorption Spectra as Probes of Minihalos Before Reionization
We study the absorption along lines of sight toward high-z radio sources caused by the 21 cm transition of neutral hydrogen in the intergalactic medium (IGM) before reionization. Using semi-analytic methods, we compute the number density of observable features caused by both “minihalos” (bound objects that are unable to cool efficiently because of their small virial temperatures) and protogalac...
متن کامل21 cm cosmology in the 21st century.
Imaging the Universe during the first hundreds of millions of years remains one of the exciting challenges facing modern cosmology. Observations of the redshifted 21 cm line of atomic hydrogen offer the potential of opening a new window into this epoch. This will transform our understanding of the formation of the first stars and galaxies and of the thermal history of the Universe. A new genera...
متن کاملThe 21 centimeter forest
We examine the prospects for studying the pre-reionization intergalactic medium (IGM) through the so-called 21 cm forest in spectra of bright high-redshift radio sources. We first compute the evolution of the mean optical depth τ for models that include X-ray heating of the IGM gas, Wouthuysen-Field coupling, and reionization. Under most circumstances, the spin temperature TS grows large well b...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2006
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2006.10603.x