Arc Centre of Excellence for All-Sky Astrophysics - Caastro

A hybrid multiresolution scheme to efficiently model the structure of reionization on the largest scales

HS Kim, JSB Wyithe, J Park, GB Poole, CG Lacey, CM Baugh

2016-02-01

Redshifted 21-cm measurements of the structure of ionized regions that grow during reionization promise to provide a new probe of ..

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..

Origin of cosmic chemical abundances

U Maio, E Tescari

2015-11-11

Cosmological N-body hydrodynamic computations following atomic and molecular chemistry (e^-, H, H⁺, H<sup>-</..

Direct Shear Mapping: Prospects for Weak Lensing Studies of Individual Galaxy-Galaxy Lensing Systems

CO De Burgh-Day, EN Taylor, RL Webster, AM Hopkins

2015-11-04

Using both a theoretical and an empirical approach, we have investigated the frequency of low redshift galaxy-galaxy lensing syste..

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

ST Loi, T Murphy, ME Bell, DL Kaplan, E Lenc, AR Offringa, N 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..

The HI mass function as a probe of photoionization feedback on low-mass galaxy formation

HS Kim, JSB Wyithe, C Power, J Park, CDP Lagos, CM Baugh

2015-11-01

We explore the galaxy formation physics governing the low-mass end of the H<inf>I</inf> mass function in the local Universe. Speci..

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 (..

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, WV 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

N Thyagarajan, DC Jacobs, JD Bowman, N Barry, AP Beardsley, G Bernardi, F Briggs, RJ Cappallo, P Carroll, AA Deshpande, A De Oliveira-Costa, JS 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

ST Loi, CM Trott, T Murphy, IH Cairns, M Bell, N Hurley-Walker, J Morgan, E 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..

Empirical covariance modeling for 21 cm power spectrum estimation: A method demonstration and new limits from early Murchison Widefield Array 128-tile data EMPIRICAL COVARIANCE MODELING for 21 CM POWER .. JOSHUA S. DILLON et al.

JS Dillon, AR Neben, JN Hewitt, M 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

ST Loi, T Murphy, IH Cairns, FW Menk, CL Waters, PJ Erickson, CM Trott, N Hurley-Walker, J Morgan, E Lenc, AR Offringa, ME Bell, RD Ekers, BM Gaensler, CJ Lonsdale, L Feng, PJ Hancock, DL 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..

Direct shear mapping - a new weak lensing tool

CO De Burgh-Day, EN Taylor, RL Webster, AM Hopkins

2015-05-01

We have developed a new technique called direct shear mapping (DSM) to measure gravitational lensing shear directly from observati..

Foregrounds in wide-field Redshifted 21 cm power spectra

N Thyagarajan, DC Jacobs, JD Bowman, N Barry, AP Beardsley, G Bernardi, F Briggs, RJ Cappallo, P Carroll, BE Corey, AD Oliveira-Costa, JS 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 stellar mass function and star formation rate-stellar mass relation of galaxies at z ~ 4-7

A Katsianis, E Tescari, JSB Wyithe

2015-04-21

We investigate the evolution of the star formation rate-stellar mass relation (SFR-M*) and galaxy stellar mass function (GSMF) of ..

A digital-receiver for the MurchisonWidefield Array

T Prabu, KS Srivani, DA Roshi, PA Kamini, S Madhavi, D Emrich, B Crosse, AJ Williams, M Waterson, AA Deshpande, NU Shankar, R Subrahmanyan, FH Briggs, RF Goeke, SJ Tingay, M Johnston-Hollitt, GM R, EH Morgan, J Pathikulangara, JD 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

N Hurley-Walker, M Johnston-Hollitt, R Ekers, R Hunstead, EM Sadler, L Hindson, P Hancock, G Bernardi, JD Bowman, F Briggs, R Cappallo, B Corey, AA Deshpande, D Emrich, BM Gaensler, R Goeke, L Greenhill, BJ Hazelton, J Hewitt, DL Kaplan

2015-03-01

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

The impact of temperature fluctuations on the large-scale clustering of the Lyα forest

B Greig, JS Bolton, SBJ Wyithe

2015-03-01

We develop a semi-analytic method for assessing the impact of the large-scale IGM temperature fluctuations expected following He I..

GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey

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

2015-02-16

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

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, BQ For, P Hancock, BJ Hazelton, L Hindson, D Jacobs, M Johnston-Hollitt

2015-02-16

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

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

2015-02-16

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

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, BQ For, BM Gaensler

2015-02-16

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

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

2015-02-16

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

The spectral variability of the GHz-peaked spectrum radio source PKS 1718-649 and a comparison of absorption models

SJ Tingay, JP Macquart, JD Collier, G Rees, JR Callingham, J Stevens, E Carretti, RB Wayth, GF Wong, CM Trott, B McKinley, G Bernardi, JD Bowman, F Briggs, RJ Cappallo, BE Corey, AA Deshpande, D Emrich, BM Gaensler, R Goeke

2015-02-01

Using the new wideband capabilities of the ATCA, we obtain spectra for PKS 1718-649, a well-known gigahertzpeaked spectrum radio s..

Limits on low-frequency radio emission from southern exoplanets with the murchison widefield array

T Murphy, ME Bell, DL Kaplan, BM Gaensler, AR Offringa, E Lenc, N 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

2015-01-01

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

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

N Hurley-Walker, J Morgan, RB Wayth, PJ Hancock, ME Bell, G Bernardi, R Bhat, F Briggs, AA Deshpande, A Ewall-Wice, L Feng, BJ Hazelton, L Hindson, DC Jacobs, DL Kaplan, N Kudryavtseva, E Lenc, B McKinley, D Mitchell, B Pindor

2014-11-14

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

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

2014-10-17

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

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

2014-10-08

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

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..