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Full-Sky Maps of the VHF Radio Sky with the Owens Valley Radio Observatory Long Wavelength Array

Published online by Cambridge University Press:  08 May 2018

Michael W. Eastwood Open the ORCID record for Michael W. Eastwood [Opens in a new window]  and
Gregg Hallinan
Michael W. Eastwood
Affiliation:
Department of Astronomy, California Institute of Technology, 1200 E California Blvd, Pasadena, CA 91125, USA email: [email protected]
Gregg Hallinan
Affiliation:
Department of Astronomy, California Institute of Technology, 1200 E California Blvd, Pasadena, CA 91125, USA email: [email protected]
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Abstract

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21-cm cosmology is a powerful new probe of the intergalactic medium at redshifts 20 ≳ z ≳ 6 corresponding to the Cosmic Dawn and Epoch of Reionization. Current observations of the highly-redshifted 21-cm transition are limited by the dynamic range they can achieve against foreground sources of low-frequency (<200 MHz) of radio emission. We used the Owens Valley Radio Observatory Long Wavelength Array (OVRO-LWA) to generate a series of new modern high-fidelity sky maps that capture emission on angular scales ranging from tens of degrees to ∼15 arcmin, and frequencies between 36 and 73 MHz. These sky maps were generated from the application of Tikhonov-regularized m-mode analysis imaging, which is a new interferometric imaging technique that is uniquely suited for low-frequency, wide-field, drift-scanning interferometers.

Keywords

cosmology: early universeISM: HII regionsISM: supernova remnantstechniques: interferometricradio continuum: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S333: Peering towards Cosmic Dawn , October 2017 , pp. 110 - 113
Copyright
Copyright © International Astronomical Union 2018 

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