Browsing by Author "Ekers, R. D."

Now showing items 1-5 of 5

    • The Australia Telescope Compact Array Broad-band Backend: description and first results 

      Wilson, Warwick E.; Ferris, R. H.; Axtens, P.; Brown, A.; Davis, E.; Hampson, G.; Leach, M.; Roberts, P.; Saunders, S.; Koribalski, B. S.; Caswell, J. L.; Lenc, E.; Stevens, J.; Voronkov, M. A.; Wieringa, M. H.; Brooks, K.; Edwards, P. G.; Ekers, R. D.; Emonts, B.; Hindson, L.; Johnston, S.; Maddison, S. T.; Mahony, E. K.; Malu, S. S.; Massardi, M.; Mao, M. Y.; McConnell, D.; Norris, R. P.; Schnitzeler, D.; Subrahmanyan, R.; Urquhart, J. S.; Thompson, Mark; Wark, R. M. (2011-09)
      Here, we describe the Compact Array Broad-band Backend (CABB) and present first results obtained with the upgraded Australia Telescope Compact Array (ATCA). The 16-fold increase in observing bandwidth, from 2 x 128 to 2 x ...

    • Broadband Spectral Modeling of the Extreme Gigahertz-Peaked Spectrum Radio Source PKS B0008-421 

      Callingham, J. R.; Gaensler, B. M.; Ekers, R. D.; Tingay, S. J.; Wayth, R. B.; Morgan, J.; Bernardi, G.; Bell, M. E.; Bhat, R.; Bowman, J. D.; Briggs, F.; Cappallo, R. J.; Deshpande, A. A.; Ewall-Wice, A.; Feng, L.; Greenhill, L. J.; Hazelton, B. J.; Hindson, L.; Hurley-Walker, N.; Jacobs, D. C.; Johnston-Hollitt, M.; Kaplan, D. L.; Kudrayavtseva, N.; Lenc, E.; Lonsdale, C. J.; McKinley, B.; McWhirter, S. R.; Mitchell, D. A.; Morales, M. F.; Morgan, E.; Oberoi, D.; Offringa, A. R.; Ord, S. M.; Pindor, B.; Prabu, T.; Procopio, P.; Riding, J.; Srivani, K. S.; Subrahmanyan, R.; Shankar, N. Udaya; Webster, R. L.; Williams, A.; Williams, C. L. (2015-08-20)
      We present broadband observations and spectral modeling of PKS B0008-421, and identify it as an extreme gigahertz-peaked spectrum (GPS) source. PKS B0008-421 is characterized by the steepest known spectral slope below the ...

    • Extragalactic Peaked-Spectrum Radio Sources at Low Frequencies 

      Callingham, J. R.; Ekers, R. D.; Gaensler, B. M.; Line, J. L. B.; Hurley-Walker, N.; Sadler, E. M.; Tingay, S. J.; Hancock, P. J.; Bell, M. E.; Dwarakanath, K. S.; For, B. -Q.; Franzen, T. M. O.; Hindson, Luke; Johnston-Hollitt, M.; Kapinska, A. D.; Lenc, E.; McKinley, B.; Morgan, J.; Offringa, A. R.; Procopio, P.; Staveley-Smith, L.; Wayth, R. B.; Wu, C.; Zheng, Q. (2017-02-20)
      We present a sample of 1,483 sources that display spectral peaks between 72 MHz and 1.4 GHz, selected from the GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey. The GLEAM survey is the widest ...

    • Limits of noise and confusion in the MWA GLEAM year 1 survey 

      Franzen, T. M. O.; Jackson, C. A.; Callingham, J. R.; Ekers, R. D.; Hancock, P. J.; Hurley-Walker, N.; Morgan, J.; Seymour, N.; Wayth, R. B.; White, S. V.; Bell, M. E.; Dwarakanath, K. S.; For, B.; Gaensler, B. M.; Hindson, L.; Johnston-Hollitt, M.; Kapinska, A. D.; Lenc, E.; McKinley, B.; Offringa, A. R.; Procopio, P.; Staveley-Smith, L.; Wu, C.; Zheng, Q. (2015-10-20)
      The GaLactic and Extragalactic All-sky MWA survey (GLEAM) is a new relatively low resolution, contiguous 72-231 MHz survey of the entire sky south of declination +25 deg. In this paper, we outline one approach to determine ...

    • Spectral energy distribution and radio halo of NGC253 at low radio frequencies 

      Kapinska, A. D.; Staveley-Smith, L.; Crocker, R.; Meurer, G. R.; Bhandari, S.; Hurley-Walker, N.; Offringa, A. R.; Hanish, D. J.; Seymour, N.; Ekers, R. D.; Bell, M. E.; Callingham, J. R.; Dwarakanath, K. S.; For, B. -Q.; Gaensler, B. M.; Hancock, P. J.; Hindson, Luke; Johnston-Hollitt, M.; Lenc, E.; McKinley, B.; Morgan, J.; Procopio, P.; Wayth, R. B.; Wu, C.; Zheng, Q.; Barry, N.; Beardsley, A. P.; Bowman, J. D.; Briggs, F.; Carroll, P.; Dillon, J. S.; Ewall-Wice, A.; Feng, L.; Greenhill, L. J.; Hazelton, B. J.; Hewitt, J. N.; Jacobs, D. J.; Kim, H. -S.; Kittiwisit, P.; Line, J.; Loeb, A.; Mitchell, D. A.; Morales, M. F.; Neben, A. R.; Paul, S.; Pindor, B.; Pober, J. C.; Riding, J.; Sethi, S. K.; Shankar, N. Udaya; Subrahmanyan, R.; Sullivan, I. S.; Tegmark, M.; Thyagarajan, N.; Tingay, S. J.; Trott, C. M.; Webster, R. L.; Wyithe, S. B. (2017-03-27)
      We present new radio continuum observations of NGC253 from the Murchison Widefield Array at frequencies between 76 and 227 MHz. We model the broadband radio spectral energy distribution for the total flux density of NGC253 ...