A Census of Southern Pulsars at 185 MHz
MetadataShow full item record
The Murchison Widefield Array, and its recently developed Voltage Capture System, facilitates extending the low-frequency range of pulsar observations at high-time and -frequency resolution in the Southern Hemisphere, providing further information about pulsars and the ISM. We present the results of an initial time-resolved census of known pulsars using the Murchison Widefield Array. To significantly reduce the processing load, we incoherently sum the detected powers from the 128 Murchison Widefield Array tiles, which yields ~10% of the attainable sensitivity of the coherent sum. This preserves the large field-of-view (~450 deg 2 at 185 MHz), allowing multiple pulsars to be observed simultaneously. We developed a WIde-field Pulsar Pipeline that processes the data from each observation and automatically folds every known pulsar located within the beam. We have detected 50 pulsars to date, 6 of which are millisecond pulsars. This is consistent with our expectation, given the telescope sensitivity and the sky coverage of the processed data (~17 000 deg 2 ). For 10 pulsars, we present the lowest frequency detections published. For a subset of the pulsars, we present multi-frequency pulse profiles by combining our data with published profiles from other telescopes. Since the Murchison Widefield Array is a low-frequency precursor to the Square Kilometre Array, we use our census results to forecast that a survey using the low-frequency component of the Square Kilometre Array Phase 1 can potentially detect around 9 400 pulsars.
© Astronomical Society of Australia 2017; published by Cambridge University Press.
Showing items related by title, author, creator and subject.
Low-Frequency Spectral Energy Distributions of Radio Pulsars Detected with the Murchison Widefield ArrayMurphy, T.; Kaplan, D.; Bell, M.; Callingham, J.; Croft, S.; Johnston, S.; Dobie, D.; Zic, A.; Hughes, J.; Lynch, C.; Hancock, P.; Hurley-Walker, Natasha; Lenc, E.; Dwarakanath, K.; For, B.; Gaensler, B.; Hindson, L.; Johnston-Hollitt, M.; Kapinska, A.; McKinley, B.; Morgan, J.; Offringa, A.; Procopio, P.; Staveley-Smith, L.; Wayth, Randall; Wu, C.; Zheng, Q. (2017)We present low-frequency spectral energy distributions of 60 known radio pulsars observed with the Murchison Widefield Array telescope. We searched the GaLactic and Extragalactic All-sky Murchison Widefield Array survey ...
Meyers, B.; Tremblay, S.; Bhat, Ramesh; Flynn, C.; Gupta, V.; Shannon, Ryan; Murray, Steven; Sobey, Charlotte; Ord, S.; Oslowski, S.; Crosse, B.; Williams, Andrew; Jankowski, F.; Farah, W.; Krishnan, V.; Bateman, T.; Bailes, M.; Beardsley, A.; Emrich, David; Franzen, Thomas; Gaensler, B.; Horsley, L.; Johnston-Hollitt, M.; Kaplan, D.; Kenney, David; Morales, M.; Pallot, D.; Steele, K.; Tingay, Steven; Trott, Cathryn; Walker, M.; Wayth, Randall; Wu, C. (2018)© 2018. The American Astronomical Society. All rights reserved.. Rare intermittent pulsars pose some of the most challenging questions surrounding the pulsar emission mechanism, but typically have relatively minimal ...
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 ...