King, O. G. and Jones, Michael E. and Blackhurst, E. J. and Copley, C. and Davis, R. J. and Dickinson, C. and Holler, C. M. and Irfan, M. O. and John, J. J. and Leahy, J. P. and Leech, J. and Muchovej, S. J. C. and Pearson, T. J. and Stevenson, M. A. and Taylor, Angela C. (2014) The C-Band All-Sky Survey (C-BASS): design and implementation of the northern receiver. Monthly Notices of the Royal Astronomical Society, 438 (3). pp. 2426-2439. ISSN 0035-8711. doi:10.1093/mnras/stt2359. https://resolver.caltech.edu/CaltechAUTHORS:20140401-101451734
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Abstract
The C-Band All-Sky Survey is a project to map the full sky in total intensity and linear polarization at 5 GHz. The northern component of the survey uses a broad-band single-frequency analogue receiver fitted to a 6.1-m telescope at the Owens Valley Radio Observatory in California, USA. The receiver architecture combines a continuous-comparison radiometer and a correlation polarimeter in a single receiver for stable simultaneous measurement of both total intensity and linear polarization, using custom-designed analogue receiver components. The continuous-comparison radiometer measures the temperature difference between the sky and temperature-stabilized cold electrical reference loads. A cryogenic front-end is used to minimize receiver noise, with a system temperature of ≈30 K in both linear polarization and total intensity. Custom cryogenic notch filters are used to counteract man-made radio frequency interference. The radiometer 1/f noise is dominated by atmospheric fluctuations, while the polarimeter achieves a 1/f noise knee frequency of 10 mHz, similar to the telescope azimuthal scan frequency.
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| Additional Information: | © 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2013 December 4. Received 2013 December 3; in original form 2013 August 30. First published online: December 27, 2013. The C-BASS project is a collaboration between Caltech/JPL in the US, Oxford and Manchester Universities in the UK, and Rhodes University and the Hartebeesthoek Radio Astronomy Observatory in South Africa. It is funded by the NSF (AST-0607857, AST-1010024 and AST-1212217), the University of Oxford, the Royal Society and the other Participating Institutions. We would like to thank Russ Keeney for technical help at OVRO. We thank theXilinx University Programme for their donation of FPGAs to this project. OGK acknowledges the support of a Dorothy Hodgkin Award in funding his studies while a student at Oxford, and the support of a W.M. Keck Institute for Space Studies Postdoctoral Fellowship at Caltech. CD acknowledges support from an STFC Advanced Fellowship, an EU Marie-Curie IRG grant and an ERC Starting Grant (no. 307209). ACT acknowledges support from a Royal Society Dorothy Hodgkin Fellowship. CC acknowledges the support of the Commonwealth Scholarship, Square Kilometre Array South Africa and Hertford College. | ||||||||||||||||||||||||||||
| Group: | Keck Institute for Space Studies | ||||||||||||||||||||||||||||
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| Subject Keywords: | instrumentation: polarimeters; Galaxy: general – radio continuum: general | ||||||||||||||||||||||||||||
| Issue or Number: | 3 | ||||||||||||||||||||||||||||
| DOI: | 10.1093/mnras/stt2359 | ||||||||||||||||||||||||||||
| Record Number: | CaltechAUTHORS:20140401-101451734 | ||||||||||||||||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140401-101451734 | ||||||||||||||||||||||||||||
| Official Citation: | King, O. G., Jones, M. E., Blackhurst, E. J., Copley, C., Davis, R. J., Dickinson, C., . . . Taylor, A. C. (2014). The C-Band All-Sky Survey (C-BASS): design and implementation of the northern receiver. Monthly Notices of the Royal Astronomical Society, 438(3), 2426-2439. doi: 10.1093/mnras/stt2359 | ||||||||||||||||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||||||||||
| ID Code: | 44570 | ||||||||||||||||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||||||||||||||||
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| Deposited On: | 02 Apr 2014 18:08 | ||||||||||||||||||||||||||||
| Last Modified: | 10 Nov 2021 16:53 |
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