FOUR FUNDAMENTAL FOREGROUND POWER SPECTRUM SHAPES FOR 21 cm COSMOLOGY OBSERVATIONS
نویسندگان
چکیده
منابع مشابه
A fast method for power spectrum and foreground analysis for 21 cm cosmology
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. We develop and demonstrate an acceleration of the Liu and Tegmark quadratic estimator formalism for inverse varianc...
متن کاملForeground Contamination in Interferometric Measurements of the Redshifted 21 Cm Power Spectrum
Subtraction of astrophysical foreground contamination from “dirty” sky maps produced by simulated measurements of the Murchison Widefield Array (MWA) has been performed by fitting a 2-order polynomial along the spectral dimension of each pixel in the data cubes. The simulations include the effects of the frequency-dependent primary antenna beams and synthesized array beams and recover the one-d...
متن کاملMapmaking for precision 21 cm cosmology
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. In order to study the " Cosmic Dawn " and the Epoch of Reionization with 21 cm tomography, we need to statistically...
متن کاملScintillation noise power spectrum and its impact on high-redshift 21-cm observations
Visibility scintillation resulting from wave propagation through the turbulent ionosphere can be an important source of noise at low radio frequencies (ν 200MHz). Many low-frequency experiments are underway to detect the power spectrum of brightness temperature fluctuations of the neutral-hydrogen 21-cm signal from the Epoch of Reionization (EoR: 12 z 7, 100 ν 175 MHz). In this paper, we derive...
متن کاملAn improved method for 21-cm foreground removal
21-cm tomography is expected to be difficult in part because of serious foreground contamination. Previous studies have found that line-of-sight approaches are capable of cleaning foregrounds to an acceptable level on large spatial scales, but not on small spatial scales. In this paper, we introduce a Fourier space formalism for describing the line-of-sight methods, and use it to introduce an i...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2012
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/752/2/137