GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey

R.B. Wayth; E. Lenc; M.E. Bell; J.R. Callingham; K.S. Dwarakanath; T.M.O. Franzen; Bi-Qing For; B. Gaensler; P. Hancock; L. Hindson; N. Hurley-Walker; C.A. Jackson; M. Johnston-Hollitt; Anna Kapińska; B. Mckinley; J. Morgan; A.R. Offringa; P. Procopio; Lister Staveley-Smith; Chen Wu; Q. Zheng; C.M. Trott; G. Bernardi; J.D. Bowman; F. Briggs; R.J. Cappallo; B.E. Corey; A.A. Deshpande; D. Emrich; R. Goeke; L.J. Greenhill; B.J. Hazelton; D.L. Kaplan; J.C. Kasper; E. Kratzenberg; C.J. Lonsdale; M.J. Lynch; S.R. Mcwhirter; D.A. Mitchell; M.F. Morales; E. Morgan; D. Oberoi; S.M. Ord; T. Prabu; A.E.E. Rogers; A. Roshi; N.U. Shankar; K.S. Srivani; R. Subrahmanyan; S.J. Tingay; M. Waterson; R.L. Webster; A.R. Whitney; A. Williams; C.L. Williams

doi:10.1017/pasa.2015.26

GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey

R.B. Wayth, E. Lenc, M.E. Bell, J.R. Callingham, K.S. Dwarakanath, T.M.O. Franzen, Bi-Qing For, B. Gaensler, P. Hancock, L. Hindson, N. Hurley-Walker, C.A. Jackson, M. Johnston-Hollitt, Anna Kapińska, B. Mckinley, J. Morgan, A.R. Offringa, P. Procopio, Lister Staveley-Smith, Chen WuQ. Zheng, C.M. Trott, G. Bernardi, J.D. Bowman, F. Briggs, R.J. Cappallo, B.E. Corey, A.A. Deshpande, D. Emrich, R. Goeke, L.J. Greenhill, B.J. Hazelton, D.L. Kaplan, J.C. Kasper, E. Kratzenberg, C.J. Lonsdale, M.J. Lynch, S.R. Mcwhirter, D.A. Mitchell, M.F. Morales, E. Morgan, D. Oberoi, S.M. Ord, T. Prabu, A.E.E. Rogers, A. Roshi, N.U. Shankar, K.S. Srivani, R. Subrahmanyan, S.J. Tingay, M. Waterson, R.L. Webster, A.R. Whitney, A. Williams, C.L. Williams

International Centre for Radio Astronomy Research (ICRAR)

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207 Citations (Web of Science)

Abstract

© 2015 Astronomical Society of Australia. 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.

Original language	English
Pages (from-to)	1-12
Journal	Publications of the Astronomical Society of Australia
Volume	32
DOIs	https://doi.org/10.1017/pasa.2015.26
Publication status	Published - 22 Jun 2015

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10.1017/pasa.2015.26

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MIRA Widefield Array - A New Low Frequency Telescope
Staveley-Smith, L., Webster, R., Briggs, F., Dickey, J., Lynch, M., Green, A., Bailes, M., Lonsdale, C., Boyle, B., Greenhill, L. & Sault, R.
Australian Research Council
1/01/08 → 31/12/09
Project: Research

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Wayth, R. B., Lenc, E., Bell, M. E., Callingham, J. R., Dwarakanath, K. S., Franzen, T. M. O., For, B-Q., Gaensler, B., Hancock, P., Hindson, L., Hurley-Walker, N., Jackson, C. A., Johnston-Hollitt, M., Kapińska, A., Mckinley, B., Morgan, J., Offringa, A. R., Procopio, P., Staveley-Smith, L., ... Williams, C. L. (2015). GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey. Publications of the Astronomical Society of Australia, 32, 1-12. https://doi.org/10.1017/pasa.2015.26

@article{9278f4c7abf54e7a9fb14310fc7ebf4a,

title = "GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey",

abstract = "{\textcopyright} 2015 Astronomical Society of Australia. 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.",

author = "R.B. Wayth and E. Lenc and M.E. Bell and J.R. Callingham and K.S. Dwarakanath and T.M.O. Franzen and Bi-Qing For and B. Gaensler and P. Hancock and L. Hindson and N. Hurley-Walker and C.A. Jackson and M. Johnston-Hollitt and Anna Kapi{\'n}ska and B. Mckinley and J. Morgan and A.R. Offringa and P. Procopio and Lister Staveley-Smith and Chen Wu and Q. Zheng and C.M. Trott and G. Bernardi and J.D. Bowman and F. Briggs and R.J. Cappallo and B.E. Corey and A.A. Deshpande and D. Emrich and R. Goeke and L.J. Greenhill and B.J. Hazelton and D.L. Kaplan and J.C. Kasper and E. Kratzenberg and C.J. Lonsdale and M.J. Lynch and S.R. Mcwhirter and D.A. Mitchell and M.F. Morales and E. Morgan and D. Oberoi and S.M. Ord and T. Prabu and A.E.E. Rogers and A. Roshi and N.U. Shankar and K.S. Srivani and R. Subrahmanyan and S.J. Tingay and M. Waterson and R.L. Webster and A.R. Whitney and A. Williams and C.L. Williams",

year = "2015",

month = jun,

day = "22",

doi = "10.1017/pasa.2015.26",

language = "English",

volume = "32",

pages = "1--12",

journal = "Publications of the Astronomincal Society of Australia (PASA)",

issn = "1323-3580",

publisher = "Cambridge University Press",

}

Wayth, RB, Lenc, E, Bell, ME, Callingham, JR, Dwarakanath, KS, Franzen, TMO, For, B-Q, Gaensler, B, Hancock, P, Hindson, L, Hurley-Walker, N, Jackson, CA, Johnston-Hollitt, M, Kapińska, A, Mckinley, B, Morgan, J, Offringa, AR, Procopio, P, Staveley-Smith, L, Wu, C, Zheng, Q, Trott, CM, Bernardi, G, Bowman, JD, Briggs, F, Cappallo, RJ, Corey, BE, Deshpande, AA, Emrich, D, Goeke, R, Greenhill, LJ, Hazelton, BJ, Kaplan, DL, Kasper, JC, Kratzenberg, E, Lonsdale, CJ, Lynch, MJ, Mcwhirter, SR, Mitchell, DA, Morales, MF, Morgan, E, Oberoi, D, Ord, SM, Prabu, T, Rogers, AEE, Roshi, A, Shankar, NU, Srivani, KS, Subrahmanyan, R, Tingay, SJ, Waterson, M, Webster, RL, Whitney, AR, Williams, A & Williams, CL 2015, 'GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey', Publications of the Astronomical Society of Australia, vol. 32, pp. 1-12. https://doi.org/10.1017/pasa.2015.26

TY - JOUR

T1 - GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey

AU - Wayth, R.B.

AU - Lenc, E.

AU - Bell, M.E.

AU - Callingham, J.R.

AU - Dwarakanath, K.S.

AU - Franzen, T.M.O.

AU - For, Bi-Qing

AU - Gaensler, B.

AU - Hancock, P.

AU - Hindson, L.

AU - Hurley-Walker, N.

AU - Jackson, C.A.

AU - Johnston-Hollitt, M.

AU - Kapińska, Anna

AU - Mckinley, B.

AU - Morgan, J.

AU - Offringa, A.R.

AU - Procopio, P.

AU - Staveley-Smith, Lister

AU - Wu, Chen

AU - Zheng, Q.

AU - Trott, C.M.

AU - Bernardi, G.

AU - Bowman, J.D.

AU - Briggs, F.

AU - Cappallo, R.J.

AU - Corey, B.E.

AU - Deshpande, A.A.

AU - Emrich, D.

AU - Goeke, R.

AU - Greenhill, L.J.

AU - Hazelton, B.J.

AU - Kaplan, D.L.

AU - Kasper, J.C.

AU - Kratzenberg, E.

AU - Lonsdale, C.J.

AU - Lynch, M.J.

AU - Mcwhirter, S.R.

AU - Mitchell, D.A.

AU - Morales, M.F.

AU - Morgan, E.

AU - Oberoi, D.

AU - Ord, S.M.

AU - Prabu, T.

AU - Rogers, A.E.E.

AU - Roshi, A.

AU - Shankar, N.U.

AU - Srivani, K.S.

AU - Subrahmanyan, R.

AU - Tingay, S.J.

AU - Waterson, M.

AU - Webster, R.L.

AU - Whitney, A.R.

AU - Williams, A.

AU - Williams, C.L.

PY - 2015/6/22

Y1 - 2015/6/22

N2 - © 2015 Astronomical Society of Australia. 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.

AB - © 2015 Astronomical Society of Australia. 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.

U2 - 10.1017/pasa.2015.26

DO - 10.1017/pasa.2015.26

M3 - Article

VL - 32

SP - 1

EP - 12

JO - Publications of the Astronomincal Society of Australia (PASA)

JF - Publications of the Astronomincal Society of Australia (PASA)

SN - 1323-3580

ER -

GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey

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MIRA Widefield Array - A New Low Frequency Telescope

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