منابع مشابه
How well can we measure and understand foregrounds with 21 cm experiments?
Before it becomes a sensitive probe of the Epoch of Reionization, the Dark Ages, and fundamental physics, 21 cm tomography must successfully contend with the issue of foreground contamination. Broadband foreground sources are expected to be roughly four orders of magnitude larger than any cosmological signals, so precise foreground models will be necessary. Such foreground models often contain ...
متن کاملWill point sources spoil 21 cm tomography ?
21 cm tomography is emerging as a promising probe of the cosmological dark ages and the epoch of reionization, as well as a tool for observational cosmology in general. However, serious sources of foreground contamination must be subtracted for experimental efforts to be viable. In this paper, we focus on the removal of unresolved extragalactic point sources with smooth spectra, and evaluate ho...
متن کاملStatistical Probes of Reionization with 21 Cm Tomography
We consider the degree to which “21 cm tomography” of the high-redshift Universe can distinguish different ionization histories. Using a new analytic model for the size distribution of H II regions that associates these ionized bubbles with large-scale galaxy overdensities, we compute the angular power spectrum and other statistical properties of the 21 cm brightness temperature during reioniza...
متن کاملA method for 21 cm power spectrum estimation in the presence of foregrounds
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. The technique of 21 cm tomography promises to be a powerful tool for estimating cosmological parameters, constraini...
متن کاملForegrounds for redshifted 21 cm studies of reionization : GMRT 153 MHz observations
Foreground subtraction is the biggest challenge for future redshifted 21 cm observations to probe reionization. We use a short GMRT observation at 153MHz to characterize the statistical properties of the background radiation across ∼ 1◦ to sub-arcminutes angular scales, and across a frequency band of 5MHz with 62.5 kHz resolution. The statistic we use is the visibility correlation function, or ...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2006
ISSN: 0004-637X,1538-4357
DOI: 10.1086/506597