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Documents detailing announcements of opportunities, calls for proposals, data releases and other community statements.
|ID||PI||Title||Time awarded (hours)|
|G0005||Murphy, Tara||(continuation) Search for Variable and Transient Sources in the EOR Fields with the MWA||350 (commensal w/ G0009)|
|G0009||Webster, Rachel||(continuation) Epoch of Reionisation||730|
|G0021||Bhat, Ramesh||Tracking interstellar space weather toward timing-array millisecond pulsars (toggle details)|
Authors: N. D. R. Bhat (Curtin), S. M. Ord (Curtin), S. E. Tremblay (Curtin), R. M. Shannon (Curtin/CASS), W. van Straten (Auckland), D. Kaplan (UWM), J.-P. Macquart (Curtin), F. Kirsten (Curtin)
Abstract: Recent LIGO detection of milli-Hertz gravitational wave (GW) signals from a black-hole merger event has further reinforced the important role of Pulsar timing array (PTA) experiments in the GW astronomy. PTAs exploit the clock-like stability of fast-spinning millisecond pulsars (MSPs) to make a direct detection of ultra-low frequency (nano-Hertz) gravitational waves. The science enabled by PTAs is thus highly complementary to that possible by LIGO-like detectors. PTAs are also a key science objective for the SKA. PTA efforts over the past few years suggest that interstellar propaga- tion effects on pulsar signals may ultimately limit the detection sensitivity of PTAs unless they are accurately measured and corrected for in timing measurements. Interstellar medium (ISM) effects are much stronger at lower radio frequencies and therefore the MWA presents an exciting and unique opportunity to calibrate interstellar propagation delays. This will potentially lead to enhanced sensi- tivity and scientific impact of PTA projects.
Since our first demonstration of ability to form a coherent (tied-array) beam by reprocessing the recorded VCS data (Bhat et al. 2016), we have successfully ported the full processing chain to the Galaxy cluster of Pawsey and demonstrated the value of high-sensitivity multi-band pulsar obser- vations that are now possible with the MWA. Here we propose further observations of two most promising PTA pulsars that will be nightly objects in the 2016B period. Our main science driver is to characterise the nature of the turbulent ISM through high-quality scintillation and dispersion studies including the investigation of chromatic (frequency-dependent) DMs. Success of these efforts will define the breadth and scope of a more ambitious program in the future, bringing in a new science niche for the MWA and SKA-low.
|3 (partially commensal with G0027)|
|G0027||Xue, Mengyao||Polarimetric Observation of Pulsars with Hexes (toggle details)|
Authors: Mengyao Xue (Curtin), Ramesh Bhat (Curtin), Steven Tremblay (Curtin), Stephen Ord (Curtin/CSIRO), Charlotte Sobey (Curtin/CASS), Franz Kirsten (Curtin)
Abstract: The MWA VCS pipeline is now reliably generating high time resolution observations of radio pulsars in all four Stokes parameters. Here, we are proposing to test the polarimetric response of and our ability to calibrate the new Hex array currently under construction. These ob- servation will provide data that will be used to study the pulsars themselves (including their emission mechanism and beam geometry), the interstellar medium and towards understanding the Galactic magnetic field. We are proposing a set of observations of three pulsars (J0034-0534, J0437-4715, and J2145-0750) at a wide range of hour angles to characterise the fidelity and sta- bility of the polarimetric solutions with the hexes. The observation would be performed between 170-200 MHz and 140-170 MHz respectively. This project will form part of the PhD program of Mengyao Xue.
|G0029||Meyers, Bradley||A Low Frequency Study of Rotating Radio Transients (toggle details)|
Authors: B. Meyers (Curtin), S. Tremblay (Curtin), R. Bhat (Curtin), R. Shannon (Curtin/CASS)
Abstract: Rotating radio transients (RRATs) are neutron stars whose radio emission is typically detectable as sporadic emission (as opposed to periodic emission). This RRAT study will observe two RRATs (J0614-03, J0545-03) which have low to moderate dispersion measures and should be detectable with the MWA. Nominally, both RRATs should be within a single pointing, due to the increased field-of-view provided by the compact hex-tile core. Given our first concrete detec- tion of the RRAT J2325-0530 with the recently implemented coherent beamformer, we expect that these sources will also be detectable. Observations below 300MHz of these RRATs have not been reported, thus the MWA provides an opportunity to perform the first low-frequency, high time resolution studies of these objects.
|G0030||McSweeney, Sammy||Testing the expanded MWA with high sensitivity observations of 47 Tuc pulsars (toggle details)|
Authors: S.J. McSweeney (Curtin, PI), N.D.R. Bhat (Curtin), S.E. Tremblay (Curtin), S. M. Ord (CASS)
Abstract: Globular clusters are breeding grounds of binary millisecond pulsars, which provide perfect tools for a wide range of astrophysics. 47 Tuc, located in the far southern hemisphere has proven to be a real gold mine, with 24 pulsars already known. Its extreme southern latitude (at a declination of -72deg) makes it inaccessible to almost all telescopes except Parkes, which operate only at frequencies >700 MHz. In this proposal we seek 1.5 hr time to confirm our tantalising detections of two of 47 Tuc pulsars in MWA VCS data recorded last year. If confirmed, this will constitute the first low-frequency detection of 47 Tuc pulsar(s), and the very first detection of a pulsar in a globular cluster with the MWA. This will have important implications for targeted searches with the expanded MWA and SKA-low, besides the prospects of probing the cluster ISM via low-frequency MWA observations.
|G0031||Paul, Sourabh||Detection of redshifted HI from the Epoch of Reionization using drift scans (toggle details)|
Authors: Sourabh Paul, Akash Kumar Patwa, Shiv Sethi, K.S. Dwarakanath (RRI)
Abstract: The detection of redshifted HI from the Epoch of Reionization (EoR) is one of the outstanding aims of modern day observational cosmology. Like many other radio in- terferometers, EoR research is one of the major science goals of MWA. We, at RRI have been involved in EoR research from past few years. We have successfully developed an independent pipeline to extract the delay power spectra from MWA tracking observation. We, simultane- ously have been progressing towards the set up of another pipeline to obtain the power spectra from drift scan observation. We seek, based on our existing endeavors, 30 hours of drift scan data from MWA observing time 2016B. Our aims are to attain both 2d & 1d power spectra, also to study various foreground removal and noise reduction strategies. The new ‘hex configuration’ of MWA would be a favorable feature for this effort, owing to many short spacing & redundant baselines, which are essential requirements for EoR science.
|G0032||Croft, Steve||Breakthrough Listen on MWA Pilot Study (toggle details)|
Authors: Steve Croft (UC Berkeley), Dr. Andrew Siemion (UC Berkeley), Prof. David Kaplan (UWMilwaukee), Dr. Steven Tremblay (Curtin)
Abstract: We propose a pilot study, using the Voltage Capture System, for Breakthrough Listen on the MWA. Breakthrough Listen (BL) is a major new project that aims to dramatically improve the coverage of parameter space in the search for intelligent life beyond Earth. BL has already deployed hardware and software to the Green Bank Telescope, and will bring a similar program with the Parkes Telescope online in the second half of 2016. The low frequency sky is however currently very poorly explored. The superb capabilities of the MWA (large field of view, low frequency of operation, and location in a very radio quiet site) provide a unique opportunity for a pilot study to obtain voltage data for a SETI (Search For Extraterrestrial Intelligence) study of the Galactic Plane.
We propose commensal observations, piggybacking on the proposed pulsar search of Tremblay et al. Using existing VCS software, combined with the pipeline developed for Breakthrough Listen at GBT and Parkes, we will perform a blind search for candidate signals from extraterrestrial intelligence. Although the chances of a detection are not large, particularly for a pilot study such as that proposed here, the Breakthrough Listen team plan to perform extensive testing and analysis on the data obtained which should be useful for other users of the MWA VCS. We will make the secondary SETI data products and associated documentation available as a resource to the community via the Breakthrough Listen online archive.
|2 (commensal with G0033)|
|G0033||Tremblay, Steve||A pilot ‘blind’ pulsar search at low frequencies using the compact MWA (toggle details)|
Authors: Steve Tremblay (Curtin, PI), N. D. R. Bhat (Curtin), Nick Swainston (Curtin), Charlotte Sobey (Curtin), David Kaplan (UWM)
Abstract: The voltage capture system (VCS) has been running for roughly a year and a half now. In that time it has generated four publications to date (more in preparation) and detected over three dozen known pulsars. However, due to the combination of a large field of view and a large tile separation of the MWA’s design, we have not been to able to undertake a pulsar survey, as this has been overly computationally expensive. The new, compact configuration changes this and we propose to perform a small pilot survey of a single field that is well populated with pulsars to lay the foundation for a larger future survey.
|G0034||Hancock, Paul||A pilot study using the MWA-Hex configurations to search for fast radio transients. (toggle details)|
Authors: Dr. Paul Hancock (Curtin), Dr. Randall Wayth (Curtin), Ms. Xiang Zhang (Curtin/Purple Mountain Observatory), Prof. David Kaplan (UWM), A. Prof Tara Murphy (Sydney University), Dr Emil Lenc (Sydney University), A. Prof Jonathan Pober (Brown University), Dr. John Morgan (Curtin University), Dr. Rajan Chhetri (Curtin University)
Abstract: We propose a pilot study to test the feasibility to use the MWA-Hex configuration to search for radio transients. Projects are already making use of data from the MWA-128T to search for many transient events. Data from G0001 (MWATS) is being used to search for pulsars based on their scintillating behavior (Bell et al., 2016). Project G0026 is searching for intrinsic emission associated with fireballs. Project G0005 has used data from EoR observations to search for fast radio bursts and conduct a blind survey for radio transients (see Rowlinson et al., 2016). These areas of research are still of great interest, and we would like to be able to continue these programs into 2017A, however the feasibility of the MWA-Hex configuration for these projects has not yet been demonstrated. We are asking for 20h of observations to demonstrate the feasibility of the MWA-Hex configuration for fast radio transient detection.
|G0035||Chhetri, Rajan||High time resolution observations of the Interplanetary Scintillation of compact sources in MWA images (toggle details)|
Authors: Rajan Chhetri, Research Associate, (Curtin University), John Morgan, Research Fellow, (Curtin Univer- sity), Steven Tremblay, Postdoctoral Researcher, (Curtin University), Jean-Pierre Macquart, Senior Re- search Fellow, (Curtin University), Jonathan Pober, Asst. Professor, (Brown University), Paul Hancock, Early Career Research Fellow, (Curtin University)
Abstract: A pilot study made with day time observations with the Murchison Widefield Array (MWA) has clearly demonstrated the feasibility using interplanetary scintillation (IPS) to identify compact components (∼ 0.1 arcsec) in MWA data. Subsequently, regular daytime observations have been made with the MWA since December 2015 to obtain an even coverage of the sky with the intention of producing a catalogue of scintil- lating, compact sources using Director’s discretionary time. Analysis of these data is ongoing. Preliminary results from this analysis have affirmed the validity of the IPS technique from the pilot study. These studies made with correlator integration time of 0.5 seconds have suggested that a finer time resolution is necessary to fully resolve and characterise the IPS in very compact sources.
Proof of concept work to image with only short baselines in the pilot data to simulate the MWA config- uration in 2016-B was done by J. Morgan and has shown the possibility of using the MWA configuration in Hexagonal mode to identify IPS. Regular observations in October - December period will allow us to obtain an even sky coverage for our overall project.
Hence, we request time to make 6 minute observations (+ 1 minute calibration scan of the sun) twice weekly in the Voltage Capture System (VCS) mode to identify and characterise IPS due to compact com- ponents in the MWA data.
The publications listed below made use of the MWA during its development and construction or resulted from gauranteed observing time. They were prepared in accordance with the MWA team's publication policy. In addition to this list, you can also find all of the published MWA collaboration papers in this ADS Library.
- Vernstrom et al. Low Frequency Radio Constraints on the Synchrotron Cosmic Web, Monthly Notices of the Royal Astronomical Society, in press, arXiv:1702.05069
- Lynch et al. 154 MHz detection of faint, polarized flares from UV Ceti, Astrophysical Journal Letters, in press, arXiv:1702.03030
- Kapinska et al. Spectral energy distribution and radio halo of NGC253 at low radio frequencies, Astrophysical Journal, in press, arXiv:1702.02434
- Lynch et al. A search for circularly polarised emission from young exoplanets, Monthly Notices of the Royal Astronomical Society, in press, arXiv:1702.01826
- Oberoi et al. Estimating solar flux density at low radio frequencies using a sky brightness model, Solar Physics, in press, arXiv:1701.07798
- McSweeney et al. Low Frequency Observations of the Subpulse Drifter PSR J0034−0721 with the Murchison Widefield Array, Astrophysical Journal, in press, arXiv:1701.06755
- George et al. A study of halo and relic radio emission in merging clusters using the Murchison Widefield Array, Monthly Notices of the Royal Astronomical Society, in press
- Callingham et al. Extragalactic Peaked-Spectrum Radio Sources at Low Frequencies, Astrophysical Journal, in press, arXiv:1701.02771
- Feng et al. A Matched Filter Technique for Slow Radio Transient Detection and First Demonstration with the Murchison Widefield Array, Astronomical Journal, in press
- Murphy et al. A search for long-timescale, low-frequency radio transients, Monthly Notices of the Royal Astronomical Society, in press, arXiv:1611.08354
- Su et al. Galactic synchrotron emissivity measurements between 250deg < l < 355deg from the GLEAM survey with the MWA, Monthly Notices of the Royal Astronomical Society, 465, 3163
- Hurley-Walker et al. GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey I: A low-frequency extragalactic catalogue, Monthly Notices of the Royal Astronomical Society, 464, 1146. Also see GLEAM Catalogue at Vizier
- Paul et al. Delay Spectrum with Phase-Tracking Arrays: Extracting the HI power spectrum from the Epoch of Reionization, Astrophysical Journal, 833, 213
- Beardsley et al. First Season MWA EoR Power Spectrum Results at Redshift 7, Astrophysical Journal, 833, 102
- Tingay et al. An Opportunistic Search for ExtraTerrestrial Intelligence (SETI) with the Murchison Widefield Array, Astrophysical Journal Letters, Volume 827, Issue 2, article id. L22 (2016).
- Lenc et al. Low frequency observations of linearly polarized structures in the interstellar medium near the south Galactic pole, Astrophysical Journal, 830, 38
- Loi et al. A new angle for probing field-aligned irregularities with the Murchison Widefield Array, Radio Science, Volume 51, Issue 6, pp. 659-679 (2016)
- Carroll et al. A High Reliability Survey of Discrete Epoch of Reionization Foreground Sources in the MWA EoR0 Field, Monthly Notices of the Royal Astronomical Society, vol. 461, issue 4, pp. 4151-4175 (2016)
- Herzog et al. The radio spectral energy distribution of infrared-faint radio sources, A&A, Volume 593, id.A130 (2016)
- Callingham et al. Low Radio Frequency Observations and Spectral Modelling of the Remnant of Supernova 1987A, Monthly Notices of the Royal Astronomical Societyl, Volume 462, Issue 1, p.290-297 (2016)
- Tingay et al. A multi-resolution, multi-epoch low radio frequency survey of the Kepler K2 mission Campaign 1 field, Astronomical Journal, Volume 152, Issue 4, article id. 82 (2016)
- Bell et al. Time-domain and spectral properties of pulsars at 154 MHz, Monthly Notices of the Royal Astronomical Society, Volume 461, Issue 1, p.908-921 (2016)
- Jacobs et al. The Murchison Widefield Array 21 cm Power Spectrum Analysis Methodology, Astrophysical Journal, Volume 825, Issue 2, article id. 114, (2016).
- Hindson et al. A Large Scale, Low Frequency Murchison Widefield Array Survey of Galactic HII regions between 260 < l < 340, PASA, Volume 33, id.e020 (2016)
- Arora et al. Ionospheric Modelling using GPS to Calibrate the MWA. II: Regional ionospheric modelling using GPS and GLONASS to estimate ionospheric gradients, PASA, Volume 33, id.e031 (2016)
- Ewall-Wice et al. First Limits on the 21 cm Power Spectrum during the Epoch of X-ray heating, Monthly Notices of the Royal Astronomical Society, Volume 460, Issue 4, p.4320-4347 (2016)
- Abbott et al. Localization and broadband follow-up of the gravitational-wave transient GW150914, Astrophysical Journal Letters, Volume 826, Issue 1, article id. L13 (2016). Also Supplement: Localization and broadband follow-up of the gravitational-wave transient GW150914, Astrophysical Journal Supplement, Volume 225, Issue 1, article id. 8 (2016)
- Franzen et al. The 154 MHz radio sky observed by the Murchison Widefield Array: noise, confusion and first source count analyses, Monthly Notices of the Royal Astronomical Society, Volume 459, Issue 3, p.3314-3325 (2016)
- Croft et al. Murchison Widefield Array Limits on Radio Emission from ANTARES Neutrino Events, Astrophysical Journal Letters, Volume 820, Issue 2, article id. L24 (2016)
- Giroletti et al. High-energy sources at low radio frequency: the Murchison Widefield Array view of Fermi blazars, A&A, Volume 588, id.A141 (2016)
- Keane et al. The host galaxy of a fast radio burst, Nature, 530, 453 (2016)
- Rowlinson et al., Limits on Fast Radio Bursts and other transient sources at 182 MHz using the Murchison Widefield Array, Monthly Notices of the Royal Astronomical Society, Volume 458, Issue 4, p.3506-3522 (2016)
- Neben et al., Beamforming Errors in Murchison Widefield Array Phased Array Antennas and their effects on Epoch of Reionization Science, Astrophysical Journal, Volume 820, Issue 1, article id. 44 (2016)
- Offringa et al., Parametrising Epoch of Reionization foregrounds: A deep survey of low-frequency point-source spectra with the MWA, Monthly Notices of the Royal Astronomical Society, Volume 458, Issue 1, p.1057-1070 (2016)
- Pober et al., The Importance of Wide-field Foreground Removal for 21 cm Cosmology: A Demonstration With Early MWA Epoch of Reionization Observations, The Astrophysical Journal, Volume 819, Issue 1, article id. 8 (2016)
- Loi et al., Density duct formation in the wake of a travelling ionospheric disturbance: Murchison Widefield Array observations, Journal of Geophysical Research: Space Physics, Volume 121, Issue 2, pp. 1569-1586 (2016)
- Trott et al., CHIPS: The Cosmological HI Power Spectrum Estimator, The Astrophysical Journal, Volume 818, Issue 2, article id. 139 (2016)
- Kaplan et al., A Deep Search for Prompt Radio Emission from the Short GRB 150424A With The Murchison Widefield Array, The Astrophysical Journal Letters, Volume 814, Issue 2, article id. L25 (2015)
- Tingay et al., A search for Fast Radio Bursts at low frequencies with Murchison Widefield Array high time resolution imaging, The Astronomical Journal, Volume 150, Issue 6, article id. 199 (2015)
- Loi et al., Quantifying ionospheric effects on time-domain astrophysics with the Murchison Widefield Array, Monthly Notices of the Royal Astronomical Society, Volume 453, Issue 3, p.2731-2746 (2015)
- Kaplan et al., Murchison Widefield Array Observations of Anomalous Variability: A Serendipitous Night-time Detection of Interplanetary Scintillation, The Astrophysical Journal Letters, Volume 809, Issue 1, article id. L12 (2015)
- Callingham et al., Broadband Spectral Modeling of the Extreme Gigahertz-peaked Spectrum Radio Source PKS B0008-421, The Astrophysical Journal, Volume 809, Issue 2, article id. 168 (2015)
- Oronsaye et al., 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, The Astrophysical Journal, Volume 809, Issue 1, article id. 51 (2015)
- Arora et al., Ionospheric Modelling using GPS to Calibrate the MWA. I: Comparison of First Order Ionospheric Effects between GPS Models and MWA Observations, Publications of the Astronomical Society of Australia, Volume 32, id.e029 (2015)
- Thyagarajan et al., Confirmation of Wide-field Signatures in Redshifted 21 cm Power Spectra, The Astrophysical Journal Letters, Volume 807, Issue 2, article id. L28 (2015)
- Loi et al., Power spectrum analysis of ionospheric fluctuations with the MWA, Radio Science, Volume 50, Issue 7, pp. 574-597 (2015)
- Dillon et al., Empirical Covariance Modeling for 21 cm Power Spectrum Estimation: A Method Demonstration and New Limits from Early Murchison Widefield Array 128-Tile Data, Physical Review D, Volume 91, Issue 12, id.123011 (2015)
- Neben et al., Measuring Phased-Array Antenna Beampatterns with High Dynamic Range for the Murchison Widefield Array using 137 MHz ORBCOMM Satellites, Radio Science, Volume 50, Issue 7, pp. 614-629 (2015)
- Wayth et al., GLEAM: The Galactic and Extragalactic All-sky MWA survey, Publications of the Astronomical Society of Australia, Volume 32, id.e025 (2015)
- George et al., An analysis of the halo and relic radio emission from Abell 3376 from Murchison Widefield Array observations, Monthly Notices of the Royal Astronomical Society, Volume 451, Issue 4, p.4207-4214(2015)
- Loi et al., Real-time imaging of density ducts between the plasmasphere and ionosphere, Geophysical Research Letters, Volume 42, Issue 10, pp. 3707-3714 (2015)
- Thyagarajan et al., Foregrounds in Wide-Field Redshifted 21 cm Power Spectra, The Astrophysical Journal, Volume 804, Issue 1, article id. 14, 15 pp. (2015)
- Ord et al., The Murchison Widefield Array Correlator, Publications of the Astronomical Society of Australia, Volume 32, id.e006 14 pp. (2015)
- Tremblay et al., The High Time and Frequency Resolution Capabilities of the Murchison Widefield Array, Publications of the Astronomical Society of Australia, Volume 32, id.e005 9 pp. (2015)
- Offringa et al., The Low-Frequency Environment of the Murchison Widefield Array: Radio-Frequency Interference Analysis and Mitigation, Publications of the Astronomical Society of Australia, Volume 32, id.e008 13 pp. (2015)
- Tingay et al., The Spectral Variability of the GHz-Peaked Spectrum Radio Source PKS 1718-649 and a Comparison of Absorption Models, The Astronomical Journal, Volume 149, Issue 2, article id. 74, 9 pp. (2015)
- Hurley-Walker et al., Serendipitous discovery of a dying Giant Radio Galaxy associated with NGC 1534, using the Murchison Widefield Array, Monthly Notices of the Royal Astronomical Society, Volume 447, Issue 3, p.2468-2478 (2015)
- Thiagaraj et al., A Digital-Receiver for the Murchison Widefield Array, Experimental Astronomy (2015)
- McKinley et al., Modelling of the spectral energy distribution of Fornax A: leptonic and hadronic production of high-energy emission from the radio lobes, Monthly Notices of the Royal Astronomical Society, Volume 446, Issue 4, p.3478-3491 (2015)
- Murphy et al., Limits on low-frequency radio emission from southern exoplanets with the Murchison Widefield Array, Monthly Notices of the Royal Astronomical Society, Volume 446, Issue 3, p.2560-2565 (2015)
- Hurley-Walker et al., The Murchison Widefield Array Commissioning Survey: A Low-Frequency Catalogue of 14 110 Compact Radio Sources over 6 100 Square Degrees, Publications of the Astronomical Society of Australia, Volume 31, id.e045 20 pp. (2015)