MIRA WIDEFIELD ARRAY: A NEW LOW FREQUENCY TELESCOPE

A SEARCH FOR FAST RADIO BURSTS AT LOW FREQUENCIES WITH MURCHISON WIDEFIELD ARRAY HIGH TIME RESOLUTION IMAGING

SJ Tingay, CM Trott, RB Wayth, G Bernardi, JD Bowman, F Briggs, RJ Cappallo, AA Deshpande, L Feng, BM Gaensler, LJ Greenhill, PJ Hancock, BJ Hazelton, M Johnston-Hollitt, DL Kaplan, CJ Lonsdale, SR McWhirter, DA Mitchell, MF Morales, E Morgan

2015-12-01

We present the results of a pilot study search for fast radio bursts (FRBs) using the Murchison Widefield Array (MWA) at low frequ..

Quantifying ionospheric effects on time-domain astrophysics with the Murchison Widefield Array

Shyeh Tjing Loi, Tara Murphy, Martin E Bell, David L Kaplan, Emil Lenc, Andre R Offringa, Natasha Hurley-Walker, G Bernardi, JD Bowman, F Briggs, RJ Cappallo, BE Corey, AA Deshpande, D Emrich, BM Gaensler, R Goeke, LJ Greenhill, BJ Hazelton, M Johnston-Hollitt, JC Kasper

2015-11-01

Refraction and diffraction of incoming radio waves by the ionosphere induce time variability in the angular positions, peak amplit..

BROADBAND SPECTRAL MODELING OF THE EXTREME GIGAHERTZ-PEAKED SPECTRUM RADIO SOURCE PKS B0008-421

JR Callingham, BM Gaensler, RD Ekers, SJ Tingay, RB Wayth, J Morgan, G Bernardi, ME Bell, R Bhat, JD Bowman, F Briggs, RJ Cappallo, AA Deshpande, A Ewall-Wice, L Feng, LJ Greenhill, BJ Hazelton, L Hindson, N Hurley-Walker, DC Jacobs

2015-08-20

We present broadband observations and spectral modeling of PKS B0008-421 and identify it as an extreme gigahertz-peaked spectrum (..

Ionospheric Modelling using GPS to Calibrate the MWA. I: Comparison of First Order Ionospheric Effects between GPS Models and MWA Observations

BS Arora, J Morgan, SM Ord, SJ Tingay, N Hurley-Walker, M Bell, G Bernardi, NDR Bhat, F Briggs, JR Callingham, AA Deshpande, KS Dwarakanath, A Ewall-Wice, L Feng, B-Q For, P Hancock, BJ Hazelton, L Hindson, D Jacobs, M Johnston-Hollitt

2015-08-10

We compare first-order (refractive) ionospheric effects seen by the MWA with the ionosphere as inferred from GPS data. The first-o..

MURCHISON WIDEFIELD ARRAY OBSERVATIONS OF ANOMALOUS VARIABILITY: A SERENDIPITOUS NIGHT-TIME DETECTION OF INTERPLANETARY SCINTILLATION

DL Kaplan, SJ Tingay, PK Manoharan, JP Macquart, P Hancock, J Morgan, DA Mitchell, RD Ekers, RB Wayth, C Trott, T Murphy, D Oberoi, IH Cairns, L Feng, N Kudryavtseva, G Bernardi, JD Bowman, F Briggs, RJ Cappallo, AA Deshpande

2015-08-10

We present observations of high-amplitude rapid (2 s) variability toward two bright, compact extragalactic radio sources out of se..

SIMULTANEOUS OBSERVATIONS OF GIANT PULSES FROM THE CRAB PULSAR, WITH THE MURCHISON WIDEFIELD ARRAY AND PARKES RADIO TELESCOPE: IMPLICATIONS FOR THE GIANT PULSE EMISSION MECHANISM

SI Oronsaye, SM Ord, NDR Bhat, SE Tremblay, SJ McSweeney, SJ Tingay, W van Straten, A Jameson, G Bernardi, JD Bowman, F Briggs, RJ Cappallo, AA Deshpande, LJ Greenhill, BJ Hazelton, M Johnston-Hollitt, DL Kaplan, CJ Lonsdale, SR McWhirter, DA Mitchell

2015-08-10

We report on observations of giant pulses from the Crab pulsar performed simultaneously with the Parkes radio telescope and the in..

CONFIRMATION OF WIDE-FIELD SIGNATURES IN REDSHIFTED 21 cm POWER SPECTRA

Nithyanandan Thyagarajan, Daniel C Jacobs, Judd D Bowman, N Barry, AP Beardsley, G Bernardi, F Briggs, RJ Cappallo, P Carroll, AA Deshpande, A de Oliveira-Costa, Joshua S Dillon, A Ewall-Wice, L Feng, LJ Greenhill, BJ Hazelton, L Hernquist, JN Hewitt, N Hurley-Walker, M Johnston-Hollitt

2015-07-10

We confirm our recent prediction of the "pitchfork" foreground signature in power spectra of high-redshift 21 cm measurements wher..

Measuring phased-array antenna beampatterns with high dynamic range for the Murchison Widefield Array using 137MHz ORBCOMM satellites

AR Neben, RF Bradley, JN Hewitt, G Bernardi, JD Bowman, F Briggs, RJ Cappallo, AA Deshpande, R Goeke, LJ Greenhill, BJ Hazelton, M Johnston-Hollitt, DL Kaplan, CJ Lonsdale, SR McWhirter, DA Mitchell, MF Morales, E Morgan, D Oberoi, SM Ord

2015-07-01

Detection of the fluctuations in a 21cm line emission from neutral hydrogen during the Epoch of Reionization in thousand hour inte..

Power spectrum analysis of ionospheric fluctuations with the Murchison Widefield Array

Shyeh Tjing Loi, Cathryn M Trott, Tara Murphy, Iver H Cairns, Martin Bell, Natasha Hurley-Walker, John Morgan, Emil Lenc, AR Offringa, L Feng, PJ Hancock, DL Kaplan, N Kudryavtseva, G Bernardi, JD Bowman, F Briggs, RJ Cappallo, BE Corey, AA Deshpande, D Emrich

2015-07-01

Low-frequency, wide field-of-view (FOV) radio telescopes such as the Murchison Widefield Array (MWA) enable the ionosphere to be s..

GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey

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

2015-06-22

GLEAM, the GaLactic and Extragalactic All-sky MWA survey, is a survey of the entire radio sky south of declination + 25° at freque..

Empirical covariance modeling for 21 cm power spectrum estimation: A method demonstration and new limits from early Murchison Widefield Array 128-tile data

Joshua S Dillon, Abraham R Neben, Jacqueline N Hewitt, Max Tegmark, N Barry, AP Beardsley, JD Bowman, F Briggs, P Carroll, A de Oliveira-Costa, A Ewall-Wice, L Feng, LJ Greenhill, BJ Hazelton, L Hernquist, N Hurley-Walker, DC Jacobs, HS Kim, P Kittiwisit, E Lenc

2015-06-19

The separation of the faint cosmological background signal from bright astrophysical foregrounds remains one of the most daunting ..

Real-time imaging of density ducts between the plasmasphere and ionosphere

Shyeh Tjing Loi, Tara Murphy, Iver H Cairns, Frederick W Menk, Colin L Waters, Philip J Erickson, Cathryn M Trott, Natasha Hurley-Walker, John Morgan, Emil Lenc, Andre R Offringa, Martin E Bell, Ronald D Ekers, BM Gaensler, Colin J Lonsdale, Lu Feng, Paul J Hancock, David L Kaplan, G Bernardi, JD Bowman

2015-05-28

Ionization of the Earth's atmosphere by sunlight forms a complex, multilayered plasma environment within the Earth's magnetosphere..

FOREGROUNDS IN WIDE-FIELD REDSHIFTED 21 cm POWER SPECTRA

Nithyanandan Thyagarajan, Daniel C Jacobs, Judd D Bowman, N Barry, AP Beardsley, G Bernardi, F Briggs, RJ Cappallo, P Carroll, BE Corey, A de Oliveira-Costa, Joshua S Dillon, D Emrich, A Ewall-Wice, L Feng, R Goeke, LJ Greenhill, BJ Hazelton, JN Hewitt, N Hurley-Walker

2015-05-01

Detection of 21 cm emission of H i from the epoch of reionization, at redshifts , is limited primarily by foreground emission. We ..

The Murchison Widefield Array Correlator

SM Ord, B Crosse, D Emrich, D Pallot, RB Wayth, MA Clark, SE Tremblay, W Arcus, D Barnes, M Bell, G Bernardi, NDR Bhat, JD Bowman, F Briggs, JD Bunton, RJ Cappallo, BE Corey, AA Deshpande, L deSouza, A Ewell-Wice

2015-03-04

The Murchison Widefield Array is a Square Kilometre Array Precursor. The telescope is located at the Murchison Radio-astronomy Obs..

The Low-Frequency Environment of the Murchison Widefield Array: Radio-Frequency Interference Analysis and Mitigation

AR Offringa, RB Wayth, N Hurley-Walker, DL Kaplan, N Barry, AP Beardsley, ME Bell, G Bernardi, JD Bowman, F Briggs, JR Callingham, RJ Cappallo, P Carroll, AA Deshpande, JS Dillon, KS Dwarakanath, A Ewall-Wice, L Feng, B-Q For, BM Gaensler

2015-03-03

The Murchison Widefield Array is a new low-frequency interferometric radio telescope built in Western Australia at one of the loca..

A digital-receiver for the Murchison Widefield Array

Thiagaraj Prabu, KS Srivani, D Anish Roshi, PA Kamini, S Madhavi, David Emrich, Brian Crosse, Andrew J Williams, Mark Waterson, Avinash A Deshpande, N Udaya Shankar, Ravi Subrahmanyan, Frank H Briggs, Robert F Goeke, Steven J Tingay, Melanie Johnston-Hollitt, MR Gopalakrishna, Edward H Morgan, Joseph Pathikulangara, John D Bunton

2015-03-01

An FPGA-based digital-receiver has been developed for a low-frequency imaging radio interferometer, the Murchison Widefield Array ..

Serendipitous discovery of a dying Giant Radio Galaxy associated with NGC 1534, using the Murchison Widefield Array

Natasha Hurley-Walker, Melanie Johnston-Hollitt, Ron Ekers, Richard Hunstead, Elaine M Sadler, Luke Hindson, Paul Hancock, Gianni Bernardi, Judd D Bowman, Frank Briggs, Roger Cappallo, Brian Corey, Avinash A Deshpande, David Emrich, Bryan M Gaensler, Robert Goeke, Lincoln Greenhill, Bryna J Hazelton, Jacqueline Hewitt, David L Kaplan

2015-03-01

Recent observations with the Murchison Widefield Array at 185 MHz have serendipitously unveiled a heretofore unknown giant and rel..

The High Time and Frequency Resolution Capabilities of the Murchison Widefield Array

SE Tremblay, SM Ord, NDR Bhat, SJ Tingay, B Crosse, D Pallot, SI Oronsaye, G Bernardi, JD Bowman, F Briggs, RJ Cappallo, BE Corey, AA Deshpande, D Emrich, R Goeke, LJ Greenhill, BJ Hazelton, M Johnston-Hollitt, DL Kaplan, JC Kasper

2015-02-26

The science cases for incorporating high time resolution capabilities into modern radio telescopes are as numerous as they are com..

Modelling of the spectral energy distribution of Fornax A: leptonic and hadronic production of high-energy emission from the radio lobes

B McKinley, R Yang, M Lopez-Caniego, F Briggs, N Hurley-Walker, RB Wayth, AR Offringa, R Crocker, G Bernardi, P Procopio, BM Gaensler, SJ Tingay, M Johnston-Hollitt, M McDonald, M Bell, NDR Bhat, JD Bowman, RJ Cappallo, BE Corey, AA Deshpande

2015-02-01

We present new low-frequency observations of the nearby radio galaxy Fornax A at 154MHz with the Murchison Widefield Array, microw..

Limits on low-frequency radio emission from southern exoplanets with the Murchison Widefield Array

Tara Murphy, Martin E Bell, David L Kaplan, BM Gaensler, Andre R Offringa, Emil Lenc, Natasha Hurley-Walker, G Bernardi, JD Bowman, F Briggs, RJ Cappallo, BE Corey, AA Deshpande, D Emrich, R Goeke, LJ Greenhill, BJ Hazelton, JN Hewitt, M Johnston-Hollitt, JC Kasper

2015-01-21

We present the results of a survey for low-frequency radio emission from 17 known exoplanetary systems with the Murchison Widefiel..

The First Murchison Widefield Array low-frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667

L Hindson, M Johnston-Hollitt, N Hurley-Walker, K Buckley, J Morgan, E Carretti, KS Dwarakanath, M Bell, G Bernardi, NDR Bhat, JD Bowman, F Briggs, RJ Cappallo, BE Corey, AA Deshpande, D Emrich, A Ewall-Wice, L Feng, BM Gaensler, R Goeke

2014-11-21

We present the first Murchison Widefield Array observations of the well-known cluster of galaxies Abell 3667 (A3667) between 105 a..

The Murchison Widefield Array Commissioning Survey: A Low-Frequency Catalogue of 14 110 Compact Radio Sources over 6 100 Square Degrees

Natasha Hurley-Walker, John Morgan, Randall B Wayth, Paul J Hancock, Martin E Bell, Gianni Bernardi, Ramesh Bhat, Frank Briggs, Avinash A Deshpande, Aaron Ewall-Wice, Lu Feng, Bryna J Hazelton, Luke Hindson, Daniel C Jacobs, David L Kaplan, Nadia Kudryavtseva, Emil Lenc, Benjamin McKinley, Daniel Mitchell, Bart Pindor

2014-11-14

We present the results of an approximately 6 100 deg2 104-196 MHz radio sky survey performed with the Murchison Widefield Array du..

WSCLEAN: an implementation of a fast, generic wide-field imager for radio astronomy

AR Offringa, B McKinley, N Hurley-Walker, FH Briggs, RB Wayth, DL Kaplan, ME Bell, L Feng, AR Neben, JD Hughes, J Rhee, T Murphy, NDR Bhat, G Bernardi, JD Bowman, RJ Cappallo, BE Corey, AA Deshpande, D Emrich, A Ewall-Wice

2014-10-11

Astronomical wide-field imaging of interferometric radio data is computationally expensive, especially for the large data volumes ..

STUDY OF REDSHIFTED H I FROM THE EPOCH OF REIONIZATION WITH DRIFT SCAN

Sourabh Paul, Shiv K Sethi, Ravi Subrahmanyan, N Udaya Shankar, KS Dwarakanath, Avinash A Deshpande, Gianni Bernardi, Judd D Bowman, Frank Briggs, Roger J Cappallo, Brian E Corey, David Emrich, Bryan M Gaensler, Robert F Goeke, Lincoln J Greenhill, Bryna J Hazelton, Jacqueline N Hewitt, Melanie Johnston-Hollitt, David L Kaplan, Justin C Kasper

2014-09-20

Detection of the epoch of reionization (EoR) in the redshifted 21 cm line is a challenging task. Here, we formulate the detection ..

THE LOW-FREQUENCY CHARACTERISTICS OF PSR J0437-4715 OBSERVED WITH THE MURCHISON WIDE-FIELD ARRAY

NDR Bhat, SM Ord, SE Tremblay, SJ Tingay, AA Deshpande, W van Straten, S Oronsaye, G Bernardi, JD Bowman, F Briggs, RJ Cappallo, BE Corey, D Emrich, R Goeke, LJ Greenhill, BJ Hazelton, JN Hewitt, M Johnston-Hollitt, DL Kaplan, JC Kasper

2014-08-20

We report on the detection of the millisecond pulsar PSR J0437-4715 with the Murchison Wide-field Array (MWA) at a frequency of 19..

Overcoming real-world obstacles in 21 cm power spectrum estimation: A method demonstration and results from early Murchison Widefield Array data

Joshua S Dillon, Adrian Liu, Christopher L Williams, Jacqueline N Hewitt, Max Tegmark, Edward H Morgan, Alan M Levine, Miguel F Morales, Steven J Tingay, Gianni Bernardi, Judd D Bowman, Frank H Briggs, Roger C Cappallo, David Emrich, Daniel A Mitchell, Divya Oberoi, Thiagaraj Prabu, Randall Wayth, Rachel L Webster

2014-01-15

We present techniques for bridging the gap between idealized inverse covariance weighted quadratic estimation of 21 cm power spect..

First Look Murchison Widefield Array observations of Abell 3667

L Hindson, M Johnston-Hollitt, N Hurley-Walker, J Morgan, K Buckley, E Carretti, KS Dwarakanath, M Bell, G Bernardi, R Bhat, F Briggs, AA Deshpande, A Ewall-Wice, L Feng, B Hazeltonm, D Jacobs, D Kaplan, N Kudryavtseva, E Lenc, B McKinley

2014-01-01

The Murchison Widefield Array (MWA) is a new low frequency interferometric radio telescope, operating in the remote Murchison Radi..

Observing the Sun with the Murchison Widefield Array

D Oberoi, R Sharma, S Bhatnagar, CJ Lonsdale, LD Matthews, IH Cairns, SJ Tingay, L Benkevitch, A Donea, SM White, G Bernardi, JD Bowman, F Briggs, RJ Cappallo, BE Corey, A Deshpande, D Emrich, BM Gaensler, R Goeke, LJ Greenhill

2014-01-01

The Sun has remained a difficult source to image for radio telescopes, especially at the low radio frequencies. Its morphologicall..

Science with the Murchison Widefield Array

Judd D Bowman, Iver Cairns, David L Kaplan, Tara Murphy, Divya Oberoi, Lister Staveley-Smith, Wayne Arcus, David G Barnes, Gianni Bernardi, Frank H Briggs, Shea Brown, John D Bunton, Adam J Burgasser, Roger J Cappallo, Shami Chatterjee, Brian E Corey, Anthea Coster, Avinash Deshpande, Ludi deSouza, David Emrich

2013-04-16

Significant new opportunities for astrophysics and cosmology have been identified at low radio frequencies. The Murchison Widefiel..

The Murchison Widefield Array: The Square Kilometre Array Precursor at Low Radio Frequencies

SJ Tingay, R Goeke, JD Bowman, D Emrich, SM Ord, DA Mitchell, MF Morales, T Booler, B Crosse, RB Wayth, CJ Lonsdale, S Tremblay, D Pallot, T Colegate, A Wicenec, N Kudryavtseva, W Arcus, D Barnes, G Bernardi, F Briggs

2013-01-24

The Murchison Widefield Array (MWA) is one of three Square Kilometre Array Precursor telescopes and is located at the Murchison Ra..

A new layout optimization technique for interferometric arrays, applied to the Murchison Widefield Array

AP Beardsley, BJ Hazelton, MF Morales, RJ Capallo, R Goeke, D Emrich, CJ Lonsdale, W Arcus, D Barnes, G Bernardi, JD Bowman, JD Bunton, BE Corey, A Deshpande, L deSouza, BM Gaensler, LJ Greenhill, D Herne, JN Hewitt, DL Kaplan

2012-09-01

Antenna layout is an important design consideration for radio interferometers because it determines the quality of the snapshot po..