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. Kapińska; B. McKinley; J. Morgan; A. R. Offringa; P. Procopio; L. Staveley-Smith; C. Wu; Q. Zheng; C. M. Trott; G. Bernardi; Judd 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. Kapińska, B. McKinley, J. Morgan, A. R. Offringa, P. Procopio, L. Staveley-Smith, C. WuQ. Zheng, C. M. Trott, G. Bernardi, Judd 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

Earth and Space Exploration, School of (SESE)

Research output: Contribution to journal › Article › peer-review

258 Scopus citations

Abstract

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 (US)
Article number	e025
Journal	Publications of the Astronomical Society of Australia
Volume	32
DOIs	https://doi.org/10.1017/pasa.2015.26
State	Published - Feb 16 2015

Keywords

Galaxy: general
radio continuum: general
radio lines: general
surveys

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1017/pasa.2015.26

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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. 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

Wayth, RB, Lenc, E, Bell, ME, Callingham, JR, Dwarakanath, KS, Franzen, TMO, For, BQ, Gaensler, B, Hancock, P, Hindson, L, Hurley-Walker, N, Jackson, CA, Johnston-Hollitt, M, Kapińska, AD, McKinley, B, Morgan, J, Offringa, AR, Procopio, P, Staveley-Smith, L, Wu, C, Zheng, Q, Trott, CM, Bernardi, G, Bowman, J, 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

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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° 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.",

keywords = "Galaxy: general, radio continuum: general, radio lines: general, surveys",

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 Kapi{\'n}ska, {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 Judd Bowman 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 = "Publisher Copyright: {\textcopyright} 2015 Astronomical Society of Australia.",

year = "2015",

month = feb,

day = "16",

doi = "10.1017/pasa.2015.26",

language = "English (US)",

volume = "32",

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

issn = "1323-3580",

publisher = "Cambridge University Press",

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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 - Kapińska, 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, Judd

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.

PY - 2015/2/16

Y1 - 2015/2/16

N2 - 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 - 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.

KW - Galaxy: general

KW - radio continuum: general

KW - radio lines: general

KW - surveys

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UR - http://www.scopus.com/inward/citedby.url?scp=84945189570&partnerID=8YFLogxK

U2 - 10.1017/pasa.2015.26

DO - 10.1017/pasa.2015.26

M3 - Article

AN - SCOPUS:84945189570

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

Abstract

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