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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Opening the 21 cm Epoch of reionization window: Measurements of foreground isolation with paper
Astrophysical Journal Letters, Volume 768, No. 2, Article L36, Year 2013
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Description
We present new observations with the Precision Array for Probing the Epoch of Reionization with the aim of measuring the properties of foreground emission for 21 cm epoch of reionization (EoR) experiments at 150 MHz. We focus on the footprint of the foregrounds in cosmological Fourier space to understand which modes of the 21 cm power spectrum will most likely be compromised by foreground emission. These observations confirm predictions that foregrounds can be isolated to a "wedge"-like region of two-dimensional (k ⊥, k ∥)-space, creating a window for cosmological studies at higher k ∥ values. We also find that the emission extends past the nominal edge of this wedge due to spectral structure in the foregrounds, with this feature most prominent on the shortest baselines. Finally, we filter the data to retain only this "unsmooth" emission and image its specific k ∥ modes. The resultant images show an excess of power at the lowest modes, but no emission can be clearly localized to any one region of the sky. This image is highly suggestive that the most problematic foregrounds for 21 cm EoR studies will not be easily identifiable bright sources, but rather an aggregate of fainter emission. © 2013. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Pober, Jonathan C.
United States, Berkeley
University of California, Berkeley
Parsons, Aaron R.
United States, Berkeley
University of California, Berkeley
Aguirre, James E.
United States, Philadelphia
University of Pennsylvania
Ali, Zaki S.
United States, Berkeley
University of California, Berkeley
Bradley, Richard F.
United States, Charlottesville
University of Virginia
United States, Charlottesville
National Radio Astronomy Observatory
Chris L. Carilli, Christopher L.
United States, Socorro
National Radio Astronomy Observatory Socorro
DeBoer, David R.
United States, Berkeley
University of California, Berkeley
Dexter, Matt R.
United States, Berkeley
University of California, Berkeley
Gugliucci, Nicole E.
United States, Charlottesville
University of Virginia
Jacobs, Daniel C.
United States, Tempe
School of Earth and Space Exploration
Klima, Pat J.
United States, Charlottesville
National Radio Astronomy Observatory
MacMahon, David Harold Edward
United States, Berkeley
University of California, Berkeley
Manley, Jason R.
South Africa, Cape Town
Conservation South Africa
Moore, David F.
United States, Philadelphia
University of Pennsylvania
Stefan, Irina I.
United Kingdom, Cambridge
Department of Physics
Walbrugh, William P.
South Africa, Cape Town
Conservation South Africa
Statistics
Citations: 133
Authors: 16
Affiliations: 8
Identifiers
Doi:
10.1088/2041-8205/768/2/L36
ISSN:
20418205
e-ISSN:
20418213
Research Areas
Environmental