Interplanetary Scintillation with the Murchison Widefield Array V: An all-sky survey of compact sources using a modern low-frequency radio telescope
MetadataShow full item record
We describe the parameters of a low-frequency all-sky survey of compact radio sources using Interplanetary Scintillation, undertaken with the Murchison Widefield Array. While this survey gives important complementary information to low-resolution survey, providing information on the sub-arsecond structure of every source, a survey of this kind has not been attempted in the era of low-frequency imaging arrays such as the Murchison Widefield Array and LOw Frequency Array. Here we set out the capabilities of such a survey, describing the limitations imposed by the heliocentric observing geometry and by the instrument itself. We demonstrate the potential for Interplanetary Scintillation measurements at any point on the celestial sphere and we show that at 160 MHz, reasonable results can be obtained within 30° of the ecliptic (2 str: half the sky). We also suggest some observational strategies and describe the first such survey, the Murchison Widefield Array Phase I Interplanetary Scintillation survey. Finally we analyse the potential of the recently upgraded Murchison Widefield Array and discuss the potential of the Square Kilometre Array-low to use Interplanetary Scintillation to probe sub-mJy flux density levels at sub-arcsecond angular resolution.
Showing items related by title, author, creator and subject.
Murchison widefield array observations of anomalous variability: A serendipitous night-time detection of interplanetary scintillationKaplan, D.; Tingay, Steven; Manoharan, P.; Macquart, Jean-Pierre; Hancock, Paul; Morgan, John; Mitchell, D.; Ekers, R.; Wayth, Randall; Trott, Cathryn; Murphy, T.; Oberoi, D.; Cairns, I.; Feng, L.; Kudryavtseva, N.; Bernardi, G.; Bowman, J.; Briggs, F.; Cappallo, R.; Deshpande, A.; Gaensler, B.; Greenhill, L.; Hurley Walker, Natasha; Hazelton, B.; Johnston Hollitt, M.; Lonsdale, C.; McWhirter, S.; Morales, M.; Morgan, E.; Ord, S.; Prabu, T.; Udaya Shankar, N.; Srivani, K.; Subrahmanyan, R.; Webster, R.; Williams, A.; Williams, C. (2015)We present observations of high-amplitude rapid (2 s) variability toward two bright, compact extragalactic radio sources out of several hundred of the brightest radio sources in one of the Murchison Widefield Array (MWA) ...
Interplanetary scintillation studies with the Murchison Widefield Array III: Comparison of source counts and densities for radio sources and their sub-arcsecond components at 162MHzChhetri, Rajan; Ekers, Ronald; Morgan, John; Macquart, Jean-Pierre; Franzen, Thomas (2018)© 2018 The Author(s). We useMurchisonWidefieldArray(MWA) observations of interplanetary scintillation (IPS) to determine the source counts of point (< 0.3 arcsec extent) sources and of all sources with some subarcsecond ...
Interplanetary scintillation studies with the Murchison Widefield Array - II. Properties of sub-arcsecond compact sources at low radio frequenciesChhetri, Rajan; Morgan, John; Ekers, Ronald; Macquart, Jean-Pierre; Sadler, E.; Giroletti, M.; Callingham, J.; Tingay, Steven (2018)We report the first astrophysical application of the technique of wide-field Interplanetary Scintillation (IPS) with the Murchison Widefield Array (MWA). This powerful technique allows us to identify and measure sub-arcsecond ...