Journal article
CONFIRMATION OF WIDE-FIELD SIGNATURES IN 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, AA Deshpande, A de Oliveira-Costa, Joshua S Dillon, A Ewall-Wice, L Feng, LJ Greenhill, BJ Hazelton, L Hernquist, JN Hewitt, N Hurley-Walker, M Johnston-Hollitt Show all
ASTROPHYSICAL JOURNAL LETTERS | IOP PUBLISHING LTD | Published : 2015
Abstract
We confirm our recent prediction of the "pitchfork" foreground signature in power spectra of high-redshift 21 cm measurements where the interferometer is sensitive to large-scale structure on all baselines. This is due to the inherent response of a wide-field instrument and is characterized by enhanced power from foreground emission in Fourier modes adjacent to those considered to be the most sensitive to the cosmological H i signal. In our recent paper, many signatures from the simulation that predicted this feature were validated against Murchison Widefield Array (MWA) data, but this key pitchfork signature was close to the noise level. In this paper, we improve the data sensitivity throug..
View full abstractRelated Projects (4)
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
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 New Zealand Ministry of Economic Development and an IBM Shared University Research Grant)
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.