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; B. -Q. For; B. Gaensler; P. Hancock; L. Hindson; N. Hurley-Walker; C. A. Jackson; M. Johnston-Hollitt; A. D. Kapinska; B. McKinley; J. Morgan; A. R. Offringa; P. Procopio; L. Staveley-Smith; C. 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. Udaya 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, B. -Q. For, B. Gaensler, P. Hancock, L. Hindson, N. Hurley-Walker, C. A. Jackson, M. Johnston-Hollitt, A. D. Kapinska, B. McKinley, J. Morgan, A. R. Offringa, P. Procopio, L. Staveley-Smith, C. 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. Udaya Shankar, K. S. Srivani, R. Subrahmanyan, S. J. Tingay, M. Waterson, R. L. Webster, A. R. Whitney, A. Williams, C. L. Williams

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Abstract

GLEAM, the GaLactic and Extragalactic All-sky MWA survey, is a survey of the entire radio sky south of declination +25 deg at frequencies between 72 and 231 MHz, made with the Murchison Widefield Array (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 x 2.2/cos(DEC+26.7) arcmin with sensitivity to structures up to ~10 deg 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
Article number	E025
Number of pages	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

Keywords

astro-ph.IM
astro-ph.CO
astro-ph.GA

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10.1017/pasa.2015.26Licence: CC BY

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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., Kapinska, A. D., 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, Article E025. https://doi.org/10.1017/pasa.2015.26

@article{358197fe69ae4fe7aa24b1da373660e5,

title = "GLEAM: The GaLactic and Extragalactic All-sky MWA survey",

abstract = "GLEAM, the GaLactic and Extragalactic All-sky MWA survey, is a survey of the entire radio sky south of declination +25 deg at frequencies between 72 and 231 MHz, made with the Murchison Widefield Array (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 x 2.2/cos(DEC+26.7) arcmin with sensitivity to structures up to ~10 deg 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.",

keywords = "astro-ph.IM, astro-ph.CO, astro-ph.GA",

author = "Wayth, {R. B.} and E. Lenc and Bell, {M. E.} and Callingham, {J. R.} and Dwarakanath, {K. S.} and Franzen, {T. M. O.} and For, {B. -Q.} and B. Gaensler and P. Hancock and L. Hindson and N. Hurley-Walker and Jackson, {C. A.} and M. Johnston-Hollitt and Kapinska, {A. D.} and B. McKinley and J. Morgan and Offringa, {A. R.} and P. Procopio and L. Staveley-Smith and C. Wu and Q. Zheng and Trott, {C. M.} and G. Bernardi and Bowman, {J. D.} and F. Briggs and Cappallo, {R. J.} and Corey, {B. E.} and Deshpande, {A. A.} and D. Emrich and R. Goeke and Greenhill, {L. J.} and Hazelton, {B. J.} and Kaplan, {D. L.} and Kasper, {J. C.} and E. Kratzenberg and Lonsdale, {C. J.} and Lynch, {M. J.} and McWhirter, {S. R.} and Mitchell, {D. A.} and Morales, {M. F.} and E. Morgan and D. Oberoi and Ord, {S. M.} and T. Prabu and Rogers, {A. E. E.} and A. Roshi and Shankar, {N. Udaya} and Srivani, {K. S.} and R. Subrahmanyan and Tingay, {S. J.} and M. Waterson and Webster, {R. L.} and Whitney, {A. R.} and A. Williams and Williams, {C. L.}",

note = "{\textcopyright} Astronomical Society of Australia 2015; published by Cambridge University Press. This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 4.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited. See: http://creativecommons.org/licenses/by/4.0/",

year = "2015",

month = jun,

day = "22",

doi = "10.1017/pasa.2015.26",

language = "English",

volume = "32",

journal = "Publications of the Astronomical Society of Australia",

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, Kapinska, AD, 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, E025. https://doi.org/10.1017/pasa.2015.26

TY - JOUR

T1 - GLEAM

T2 - 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, B. -Q.

AU - Gaensler, B.

AU - Hancock, P.

AU - Hindson, L.

AU - Hurley-Walker, N.

AU - Jackson, C. A.

AU - Johnston-Hollitt, M.

AU - Kapinska, A. D.

AU - McKinley, B.

AU - Morgan, J.

AU - Offringa, A. R.

AU - Procopio, P.

AU - Staveley-Smith, L.

AU - Wu, C.

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. Udaya

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.

N1 - © Astronomical Society of Australia 2015; published by Cambridge University Press. This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 4.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited. See: http://creativecommons.org/licenses/by/4.0/

PY - 2015/6/22

Y1 - 2015/6/22

N2 - GLEAM, the GaLactic and Extragalactic All-sky MWA survey, is a survey of the entire radio sky south of declination +25 deg at frequencies between 72 and 231 MHz, made with the Murchison Widefield Array (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 x 2.2/cos(DEC+26.7) arcmin with sensitivity to structures up to ~10 deg 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 - GLEAM, the GaLactic and Extragalactic All-sky MWA survey, is a survey of the entire radio sky south of declination +25 deg at frequencies between 72 and 231 MHz, made with the Murchison Widefield Array (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 x 2.2/cos(DEC+26.7) arcmin with sensitivity to structures up to ~10 deg 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.

KW - astro-ph.IM

KW - astro-ph.CO

KW - astro-ph.GA

U2 - 10.1017/pasa.2015.26

DO - 10.1017/pasa.2015.26

M3 - Article

SN - 1323-3580

VL - 32

JO - Publications of the Astronomical Society of Australia

JF - Publications of the Astronomical Society of Australia

M1 - E025

ER -

GLEAM: The GaLactic and Extragalactic All-sky MWA survey

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