Self-calibration of highly-redundant low-frequency arrays - Initial results with HERA
View / Open Files
Authors
Nikolic, B
Carilli, C
Publication Date
2017Journal Title
2017 32nd General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2017
Publisher
IEEE
Volume
2017-January
Pages
1-4
Type
Article
Metadata
Show full item recordCitation
Nikolic, B., & Carilli, C. (2017). Self-calibration of highly-redundant low-frequency arrays - Initial results with HERA. 2017 32nd General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2017, 2017-January 1-4. https://doi.org/10.23919/URSIGASS.2017.8105387
Abstract
HERA is a highly-redundant transit interferometer with 14\,m-diameter
parabolic dish elements. We exploit the fact that the Galactic centre transits
through the main beam of the telescope to attempt a conventional
self-calibration approach to imaging and calibration. The Galactic centre
provides a bright source which, we show, can be approximated as a point source
sufficiently well to initialise the self-calibration loop and derive initial
delays and antenna frequency-independent phases. Subsequent iteration using a
more complex sky model derived from the data itself then converges to a
reasonable bandpass calibration. The calibration solutions have good stability
properties. We show therefore that the conventional self-calibration is a
feasible parallel approach in addition to the redundant calibration already
planned for HERA. The conventional imaging and calibration is useful as a
cross-check to the alternatives being pursued in the HERA project, as a way of
quantifying the performance of the hardware on the ground (and potentially
identifying problems) and as a route to imaging and removing brighter continuum
sources before power spectrum analysis.
Identifiers
External DOI: https://doi.org/10.23919/URSIGASS.2017.8105387
This record's URL: https://www.repository.cam.ac.uk/handle/1810/283397
Rights
Licence:
http://www.rioxx.net/licenses/all-rights-reserved
Statistics
Total file downloads (since January 2020). For more information on metrics see the
IRUS guide.
Recommended or similar items
The current recommendation prototype on the Apollo Repository will be turned off on 03 February 2023. Although the pilot has been fruitful for both parties, the service provider IKVA is focusing on horizon scanning products and so the recommender service can no longer be supported. We recognise the importance of recommender services in supporting research discovery and are evaluating offerings from other service providers. If you would like to offer feedback on this decision please contact us on: support@repository.cam.ac.uk