Journal article
FOREGROUNDS IN WIDE-FIELD REDSHIFTED 21 cm POWER SPECTRA
Nithyanandan Thyagarajan, Daniel C Jacobs, Judd D Bowman, N Barry, AP Beardsley, G Bernardi, F Briggs, RJ Cappallo, P Carroll, BE Corey, A de Oliveira-Costa, Joshua S Dillon, D Emrich, A Ewall-Wice, L Feng, R Goeke, LJ Greenhill, BJ Hazelton, JN Hewitt, N Hurley-Walker Show all
ASTROPHYSICAL JOURNAL | IOP PUBLISHING LTD | Published : 2015
Abstract
Detection of 21 cm emission of H i from the epoch of reionization, at redshifts , is limited primarily by foreground emission. We investigate the signatures of wide-field measurements and an all-sky foreground model using the delay spectrum technique that maps the measurements to foreground object locations through signal delays between antenna pairs. We demonstrate interferometric measurements are inherently sensitive to all scales, including the largest angular scales, owing to the nature of wide-field measurements. These wide-field effects are generic to all observations but antenna shapes impact their amplitudes substantially. A dish-shaped antenna yields the most desirable features from..
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Grants
Awarded by U.S. National Science Foundation (NSF)
Awarded by NSF Astronomy and Astrophysics Postdoctoral Fellowship
Awarded by NSF Astronomy and Astrophysics Fellowship
Awarded by NSF
Awarded by Australian Research Council (LIEF grants)
Awarded by U.S. Air Force Office of Scientific Research
Awarded by Centre for All-sky Astrophysics (an Australian Research Council Centre of Excellence)
Awarded by Victoria University of Wellington (via grant from the New Zealand Ministry of Economic Development)
Awarded by Direct For Mathematical & Physical Scien
Funding Acknowledgements
This work was supported by the U.S. National Science Foundation (NSF) through award AST-1109257. D.C.J. is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-1401708. J.C.P. is supported by an NSF Astronomy and Astrophysics Fellowship under award AST-1302774. This work makes use of the Murchison Radio-astronomy Observatory, operated by CSIRO. We acknowledge the Wajarri Yamatji people as the traditional owners of the Observatory site. Support for the MWA comes from the NSF (awards: AST-0457585, PHY-0835713, CAREER-0847753, and AST-0908884), the Australian Research Council (LIEF grants LE0775621 and LE0882938), the U.S. Air Force Office of Scientific Research (grant FA9550-0510247), and the Centre for All-sky Astrophysics (an Australian Research Council Centre of Excellence funded by grant CE110001020). Support is also provided by the Smithsonian Astrophysical Observatory, the MIT School of Science, the Raman Research Institute, the Australian National University, and the Victoria University of Wellington (via grant MED-E1799 from the New Zealand Ministry of Economic Development and an IBM Shared University Research Grant). The Australian Federal government provides additional support via the Commonwealth Scientific and Industrial Research Organisation (CSIRO), National Collaborative Research Infrastructure Strategy, Education Investment Fund, and the Australia India Strategic Research Fund, and Astronomy Australia Limited, under contract to Curtin University. We acknowledge the iVEC Petabyte Data Store, the Initiative in Innovative Computing and the CUDA Center for Excellence sponsored by NVIDIA at Harvard University, and the International Centre for Radio Astronomy Research (ICRAR), a Joint Venture of Curtin University and The University of Western Australia, funded by the Western Australian State government.