GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey

GLEAM, the GaLactic and Extragalactic All-sky MWA survey, is a survey of the entire radio sky south of declination + 25° at frequencies between 72 and 231 MHz, made with the MWA using a drift scan method that makes efficient use of the MWA’s very large field-of-view. We present the observation detai...

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Main Authors:	Wayth, Randall, Lenc, E., Bell, M., Callingham, J., Dwarakanath, K., Franzen, T., For, B., Gaensler, B., Hancock, P., Hindson, L., Hurley-Walker, N., Jackson, C., Johnston-Hollitt, M., Kapinska, A., McKinley, B., Morgan, J., Offringa, A., Procopio, P., Staveley-Smith, L., Wu, C., Zheng, Q., Trott, C., Bernardi, G., Bowman, J., Briggs, F., Cappallo, R., Corey, B., Deshpande, A., Emrich, D., Goeke, R., Greenhill, L., Hazelton, B., Kaplan, D., Kasper, J., Kratzenberg, E., Lonsdale, C., Lynch, Mervyn, McWhirter, S., Mitchell, D., Morales, M., Morgan, E., Oberoi, D., Ord, S., Prabu, T., Rogers, A., Roshi, A., Shankar, N., Srivani, K., Subrahmanyan, R., Tingay, Steven, Waterson, M., Webster, R., Whitney, A., Williams, A., Williams, C.
Format:	Journal Article
Published:	Cambridge University Press 2015
Online Access:	http://hdl.handle.net/20.500.11937/43657

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author	Wayth, Randall Lenc, E. Bell, M. Callingham, J. Dwarakanath, K. Franzen, T. For, B. Gaensler, B. Hancock, P. Hindson, L. Hurley-Walker, N. Jackson, C. Johnston-Hollitt, M. Kapinska, A. McKinley, B. Morgan, J. Offringa, A. Procopio, P. Staveley-Smith, L. Wu, C. Zheng, Q. Trott, C. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Corey, B. Deshpande, A. Emrich, D. Goeke, R. Greenhill, L. Hazelton, B. Kaplan, D. Kasper, J. Kratzenberg, E. Lonsdale, C. Lynch, Mervyn McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Prabu, T. Rogers, A. Roshi, A. Shankar, N. Srivani, K. Subrahmanyan, R. Tingay, Steven Waterson, M. Webster, R. Whitney, A. Williams, A. Williams, C.
author_facet	Wayth, Randall Lenc, E. Bell, M. Callingham, J. Dwarakanath, K. Franzen, T. For, B. Gaensler, B. Hancock, P. Hindson, L. Hurley-Walker, N. Jackson, C. Johnston-Hollitt, M. Kapinska, A. McKinley, B. Morgan, J. Offringa, A. Procopio, P. Staveley-Smith, L. Wu, C. Zheng, Q. Trott, C. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Corey, B. Deshpande, A. Emrich, D. Goeke, R. Greenhill, L. Hazelton, B. Kaplan, D. Kasper, J. Kratzenberg, E. Lonsdale, C. Lynch, Mervyn McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Prabu, T. Rogers, A. Roshi, A. Shankar, N. Srivani, K. Subrahmanyan, R. Tingay, Steven Waterson, M. Webster, R. Whitney, A. Williams, A. Williams, C.
author_sort	Wayth, Randall
building	Curtin Institutional Repository
collection	Online Access
description	GLEAM, the GaLactic and Extragalactic All-sky MWA survey, is a survey of the entire radio sky south of declination + 25° at frequencies between 72 and 231 MHz, made with the MWA using a drift scan method that makes efficient use of the MWA’s very large field-of-view. We present the observation details, imaging strategies, and theoretical sensitivity for GLEAM. The survey ran for two years, the first year using 40-kHz frequency resolution and 0.5-s time resolution; the second year using 10-kHz frequency resolution and 2 s time resolution. The resulting image resolution and sensitivity depends on observing frequency, sky pointing, and image weighting scheme. At 154 MHz, the image resolution is approximately 2.5 × 2.2/cos (δ + 26.7°) arcmin with sensitivity to structures up to ~ 10° in angular size. We provide tables to calculate the expected thermal noise for GLEAM mosaics depending on pointing and frequency and discuss limitations to achieving theoretical noise in Stokes I images. We discuss challenges, and their solutions, that arise for GLEAM including ionospheric effects on source positions and linearly polarised emission, and the instrumental polarisation effects inherent to the MWA’s primary beam.
first_indexed	2025-11-14T09:17:23Z
format	Journal Article
id	curtin-20.500.11937-43657
institution	Curtin University Malaysia
institution_category	Local University
last_indexed	2025-11-14T09:17:23Z
publishDate	2015
publisher	Cambridge University Press
recordtype	eprints
repository_type	Digital Repository
spelling	curtin-20.500.11937-436572017-09-13T13:38:56Z GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey Wayth, Randall Lenc, E. Bell, M. Callingham, J. Dwarakanath, K. Franzen, T. For, B. Gaensler, B. Hancock, P. Hindson, L. Hurley-Walker, N. Jackson, C. Johnston-Hollitt, M. Kapinska, A. McKinley, B. Morgan, J. Offringa, A. Procopio, P. Staveley-Smith, L. Wu, C. Zheng, Q. Trott, C. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Corey, B. Deshpande, A. Emrich, D. Goeke, R. Greenhill, L. Hazelton, B. Kaplan, D. Kasper, J. Kratzenberg, E. Lonsdale, C. Lynch, Mervyn McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Prabu, T. Rogers, A. Roshi, A. Shankar, N. Srivani, K. Subrahmanyan, R. Tingay, Steven Waterson, M. Webster, R. Whitney, A. Williams, A. Williams, C. GLEAM, the GaLactic and Extragalactic All-sky MWA survey, is a survey of the entire radio sky south of declination + 25° at frequencies between 72 and 231 MHz, made with the MWA using a drift scan method that makes efficient use of the MWA’s very large field-of-view. We present the observation details, imaging strategies, and theoretical sensitivity for GLEAM. The survey ran for two years, the first year using 40-kHz frequency resolution and 0.5-s time resolution; the second year using 10-kHz frequency resolution and 2 s time resolution. The resulting image resolution and sensitivity depends on observing frequency, sky pointing, and image weighting scheme. At 154 MHz, the image resolution is approximately 2.5 × 2.2/cos (δ + 26.7°) arcmin with sensitivity to structures up to ~ 10° in angular size. We provide tables to calculate the expected thermal noise for GLEAM mosaics depending on pointing and frequency and discuss limitations to achieving theoretical noise in Stokes I images. We discuss challenges, and their solutions, that arise for GLEAM including ionospheric effects on source positions and linearly polarised emission, and the instrumental polarisation effects inherent to the MWA’s primary beam. 2015 Journal Article http://hdl.handle.net/20.500.11937/43657 10.1017/pasa.2015.26 Cambridge University Press unknown
spellingShingle	Wayth, Randall Lenc, E. Bell, M. Callingham, J. Dwarakanath, K. Franzen, T. For, B. Gaensler, B. Hancock, P. Hindson, L. Hurley-Walker, N. Jackson, C. Johnston-Hollitt, M. Kapinska, A. McKinley, B. Morgan, J. Offringa, A. Procopio, P. Staveley-Smith, L. Wu, C. Zheng, Q. Trott, C. Bernardi, G. Bowman, J. Briggs, F. Cappallo, R. Corey, B. Deshpande, A. Emrich, D. Goeke, R. Greenhill, L. Hazelton, B. Kaplan, D. Kasper, J. Kratzenberg, E. Lonsdale, C. Lynch, Mervyn McWhirter, S. Mitchell, D. Morales, M. Morgan, E. Oberoi, D. Ord, S. Prabu, T. Rogers, A. Roshi, A. Shankar, N. Srivani, K. Subrahmanyan, R. Tingay, Steven Waterson, M. Webster, R. Whitney, A. Williams, A. Williams, C. GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey
title	GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey
title_full	GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey
title_fullStr	GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey
title_full_unstemmed	GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey
title_short	GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey
title_sort	gleam: the galactic and extragalactic all-sky mwa survey
url	http://hdl.handle.net/20.500.11937/43657

GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey

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