no code implementations • 11 Mar 2021 • Torrance Hodgson, Iacopo Bartalucci, Melanie Johnston-Hollitt, Benjamin McKinley, Franco Vazza, Denis Wittor
We report on the discovery of a mysterious ultra-steep spectrum (USS) synchrotron source in the galaxy cluster Abell 2877.
Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics
no code implementations • 5 Jun 2020 • George Heald, Sui Ann Mao, Valentina Vacca, Takuya Akahori, Ancor Damas-Segovia, B. M. Gaensler, Matthias Hoeft, Ivan Agudo, Aritra Basu, Rainer Beck, Mark Birkinshaw, Annalisa Bonafede, Tyler L. Bourke, Andrea Bracco, Ettore Carretti, Luigina Feretti, J. M. Girart, Federica Govoni, James A. Green, JinLin Han, Marijke Haverkorn, Cathy Horellou, Melanie Johnston-Hollitt, Roland Kothes, Tom Landecker, Blazej Nikiel-Wroczynski, Shane P. O'Sullivan, Marco Padovani, Frederick Poidevin, Luke Pratley, Marco Regis, Christopher John Riseley, Tim Robishaw, Lawrence Rudnick, Charlotte Sobey, Jeroen M. Stil, Xiaohui Sun, Sharanya Sur, A. Russ Taylor, Alec Thomson, Cameron L. Van Eck, Franco Vazza, Jennifer L. West, the SKA Magnetism Science Working Group
The Square Kilometre Array (SKA) will answer fundamental questions about the origin, evolution, properties, and influence of magnetic fields throughout the Universe.
Astrophysics of Galaxies Instrumentation and Methods for Astrophysics
1 code implementation • 27 Apr 2020 • Sarah V. White, Thomas M. O. Franzen, Chris J. Riseley, O. Ivy Wong, Anna D. Kapińska, Natasha Hurley-Walker, Joseph R. Callingham, Kshitij Thorat, Chen Wu, Paul Hancock, Richard W. Hunstead, Nick Seymour, Jesse Swan, Randall Wayth, John Morgan, Rajan Chhetri, Carole Jackson, Stuart Weston, Martin Bell, Bi-Qing For, B. M. Gaensler, Melanie Johnston-Hollitt, André Offringa, Lister Staveley-Smith
Of these G4Jy sources, 78 are resolved by the MWA (Phase-I) synthesised beam ($\sim$2 arcmin at 200 MHz), and we label 67% of the sample as 'single', 26% as 'double', 4% as 'triple', and 3% as having 'complex' morphology at $\sim$1 GHz (45-arcsec resolution).
Astrophysics of Galaxies
1 code implementation • 27 Apr 2020 • Sarah V. White, Thomas M. O. Franzen, Chris J. Riseley, O. Ivy Wong, Anna D. Kapińska, Natasha Hurley-Walker, Joseph R. Callingham, Kshitij Thorat, Chen Wu, Paul Hancock, Richard W. Hunstead, Nick Seymour, Jesse Swan, Randall Wayth, John Morgan, Rajan Chhetri, Carole Jackson, Stuart Weston, Martin Bell, B. M. Gaensler, Melanie Johnston-Hollitt, André Offringa, Lister Staveley-Smith
This is the GaLactic and Extragalactic All-sky MWA (GLEAM) Survey, and we have previously used a combination of visual inspection, cross-checks against the literature, and internal matching to identify the 'brightest' radio-sources ($S_{\mathrm{151MHz}} >$ 4 Jy) in the extragalactic catalogue (Galactic latitude, $|b| >$ 10 deg).
Astrophysics of Galaxies
1 code implementation • 24 Jul 2018 • Luke Pratley, Melanie Johnston-Hollitt, Jason D. McEwen
We show that the same calculation can be performed with a radially symmetric $w$-projection kernel, where we use one dimensional adaptive quadrature to calculate the resulting Hankel transform, decreasing the computation required for kernel generation by several orders of magnitude, whilst preserving the accuracy.
Instrumentation and Methods for Astrophysics
no code implementations • 26 Oct 2016 • Natasha Hurley-Walker, Joseph R. Callingham, Paul J. Hancock, Thomas M. O. Franzen, Luke Hindson, Anna D. Kapinska, John Morgan, Andre R. Offringa, Randall B. Wayth, Chen Wu, Q. Zheng, Tara Murphy, Martin E. Bell, K. S. Dwarakanath, Bi-Qing For, Bryan M. Gaensler, Melanie Johnston-Hollitt, Emil Lenc, Pietro Procopio, Lister Staveley-Smith, Ron Ekers, Judd D. Bowman, Frank Briggs, R. J. Cappallo, Avinash A. Deshpande, Lincoln Greenhill, Brynah J. Hazelton, David L. Kaplan, Colin J. Lonsdale, S. R. McWhirter, Daniel A. Mitchell, Miguel F. Morales, Edward Morgan, Divya Oberoi, Stephen M. Ord, T. Prabu, N. Udaya Shankar, K. S. Srivani, Ravi Subrahmanyan, Steven J. Tingay, Rachel L. Webster, Andrew Williams, Christopher L. Williams
Using the Murchison Widefield Array (MWA), the low-frequency Square Kilometre Array (SKA1 LOW) precursor located in Western Australia, we have completed the GaLactic and Extragalactic All-sky MWA (GLEAM) survey, and present the resulting extragalactic catalogue, utilising the first year of observations.
Astrophysics of Galaxies
2 code implementations • 7 Sep 2012 • Ian Sullivan, Miguel Morales, Bryna Hazelton, Wayne Arcus, David Barnes, Gianni Bernardi, Frank Briggs, Judd D. Bowman, John Bunton, Roger Cappallo, Brian Corey, Avinash Deshpande, Ludi deSouza, David Emrich, B. M. Gaensler, Robert Goeke, Lincoln Greenhill, David Herne, Jacqueline Hewitt, Melanie Johnston-Hollitt, David Kaplan, Justin Kasper, Barton Kincaid, Ronald Koenig, Eric Kratzenberg, Colin Lonsdale, Mervyn Lynch, Russell McWhirter, Daniel Mitchell, Edward Morgan, Divya Oberoi, Stephen Ord, Joseph Pathikulangara, Thiagaraj Prabu, Ron Remillard, Alan Rogers, Anish Roshi, Joseph Salah, Robert Sault, Udaya Shankar, K. Srivani, Jamie Stevens, Ravi Subrahmanyan, Steven Tingay, Randall Wayth, Mark Waterson, Rachel Webster, Alan Whitney, Andrew Williams, Chris Williams, Stuart Wyithe
We introduce the Fast Holographic Deconvolution method for analyzing interferometric radio data.
Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics
