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27 results on '"Hayman, D. B."'

1. The CRAFT Coherent (CRACO) upgrade I: System Description and Results of the 110-ms Radio Transient Pilot Survey

Author

Wang, Z., Bannister, K. W., Gupta, V., Deng, X., Pilawa, M., Tuthill, J., Bunton, J. D., Flynn, C., Glowacki, M., Jaini, A., Lee, Y. W. J., Lenc, E., Lucero, J., Paek, A., Radhakrishnan, R., Thyagarajan, N., Uttarkar, P., Wang, Y., Bhat, N. D. R., James, C. W., Moss, V. A., Murphy, Tara, Reynolds, J. E., Shannon, R. M., Spitler, L. G., Tzioumis, A., Caleb, M., Deller, A. T., Gordon, A. C., Marnoch, L., Ryder, S. D., Simha, S., Anderson, C. S., Ball, L., Brodrick, D., Cooray, F. R., Gupta, N., Hayman, D. B., Ng, A., Pearce, S. E., Phillips, C., Voronkov, M. A., and Westmeier, T.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We present the first results from a new backend on the Australian Square Kilometre Array Pathfinder, the Commensal Realtime ASKAP Fast Transient COherent (CRACO) upgrade. CRACO records millisecond time resolution visibility data, and searches for dispersed fast transient signals including fast radio bursts (FRB), pulsars, and ultra-long period objects (ULPO). With the visibility data, CRACO can localise the transient events to arcsecond-level precision after the detection. Here, we describe the CRACO system and report the result from a sky survey carried out by CRACO at 110ms resolution during its commissioning phase. During the survey, CRACO detected two FRBs (including one discovered solely with CRACO, FRB 20231027A), reported more precise localisations for four pulsars, discovered two new RRATs, and detected one known ULPO, GPM J1839-10, through its sub-pulse structure. We present a sensitivity calibration of CRACO, finding that it achieves the expected sensitivity of 11.6 Jy ms to bursts of 110 ms duration or less. CRACO is currently running at a 13.8 ms time resolution and aims at a 1.7 ms time resolution before the end of 2024. The planned CRACO has an expected sensitivity of 1.5 Jy ms to bursts of 1.7 ms duration or less, and can detect 10x more FRBs than the current CRAFT incoherent sum system (i.e., 0.5-2 localised FRBs per day), enabling us to better constrain he models for FRBs and use them as cosmological probes., Comment: 26 pages, 19 figures, 9 tables, Accepted for publication in PASA

Published
2024
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2. WALLABY Pilot Survey: Public release of HI data for almost 600 galaxies from phase 1 of ASKAP pilot observations

Author

Westmeier, T., Deg, N., Spekkens, K., Reynolds, T. N., Shen, A. X., Gaudet, S., Goliath, S., Huynh, M. T., Venkataraman, P., Lin, X., O'Beirne, T., Catinella, B., Cortese, L., Dénes, H., Elagali, A., For, B. -Q., Józsa, G. I. G., Howlett, C., van der Hulst, J. M., Jurek, R. J., Kamphuis, P., Kilborn, V. A., Kleiner, D., Koribalski, B. S., Lee-Waddell, K., Murugeshan, C., Rhee, J., Serra, P., Shao, L., Staveley-Smith, L., Wang, J., Wong, O. I., Zwaan, M. A., Allison, J. R., Anderson, C. S., Ball, Lewis, Bock, D. C. -J., Brodrick, D., Bunton, J. D., Cooray, F. R., Gupta, N., Hayman, D. B., Mahony, E. K., Moss, V. A., Ng, A., Pearce, S. E., Raja, W., Roxby, D. N., Voronkov, M. A., Warhurst, K. A., Courtois, H. M., and Said, K.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We present WALLABY pilot data release 1, the first public release of HI pilot survey data from the Wide-field ASKAP L-band Legacy All-sky Blind Survey (WALLABY) on the Australian Square Kilometre Array Pathfinder. Phase 1 of the WALLABY pilot survey targeted three $60~{\rm deg}^2$ regions on the sky in the direction of the Hydra and Norma galaxy clusters and the NGC 4636 galaxy group, covering the redshift range of z < 0.08. The source catalogue, images and spectra of nearly 600 extragalactic HI detections and kinematic models for 109 spatially resolved galaxies are available. As the pilot survey targeted regions containing nearby group and cluster environments, the median redshift of the sample of z ~ 0.014 is relatively low compared to the full WALLABY survey. The median galaxy HI mass is $2.3 \times 10^{9}~M_{\odot}$. The target noise level of 1.6 mJy per $30''$ beam and 18.5 kHz channel translates into a $5\sigma$ HI mass sensitivity for point sources of about $5.2 \times 10^{8} \, (D_{\rm L} / \mathrm{100~Mpc})^{2} \, M_{\odot}$ across 50 spectral channels (~200 km/s) and a $5\sigma$ HI column density sensitivity of about $8.6 \times 10^{19} \, (1 + z)^{4}~\mathrm{cm}^{-2}$ across 5 channels (~20 km/s) for emission filling the $30''$ beam. As expected for a pilot survey, several technical issues and artefacts are still affecting the data quality. Most notably, there are systematic flux errors of up to several 10% caused by uncertainties about the exact size and shape of each of the primary beams as well as the presence of sidelobes due to the finite deconvolution threshold. In addition, artefacts such as residual continuum emission and bandpass ripples have affected some of the data. The pilot survey has been highly successful in uncovering such technical problems, most of which are expected to be addressed and rectified before the start of the full WALLABY survey., Comment: 24 pages, 13 figures, 5 tables, accepted for publication in PASA

Published
2022
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3. GASKAP-HI Pilot Survey Science I: ASKAP Zoom Observations of HI Emission in the Small Magellanic Cloud

Author

Pingel, N. M., Dempsey, J., McClure-Griffiths, N. M., Dickey, J. M., Jameson, K. E., Arce, H., Anglada, G., Bland-Hawthorn, J., Breen, S. L., Buckland-Willis, F., Clark, S. E., Dawson, J. R., Dénes, H., Di Teodoro, E. M., For, B. -Q., Foster, Tyler J., Gómez, J. F., Imai, H., Joncas, G., Kim, C. -G., Lee, M. -Y., Lynn, C., Leahy, D., Ma, Y. K., Marchal, A., McConnell, D., Miville-Deschênes, M. -A., Moss, V. A., Murray, C. E., Nidever, D., Peek, J., Stanimirović, S., Staveley-Smith, L., Tepper-Garcia, T., Tremblay, C. D., Uscanga, L., van Loon, J. Th., Vázquez-Semadeni, E., Allison, J. R., Anderson, C. S., Ball, Lewis, Bell, M., Bock, D. C. -J., Bunton, J., Cooray, F. R., Cornwell, T., Koribalski, B. S., Gupta, N., Hayman, D. B., Harvey-Smith, L., Lee-Waddell, K., Ng, A., Phillips, C. J., Voronkov, M., Westmeier, T., and Whiting, M. T.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We present the most sensitive and detailed view of the neutral hydrogen (HI) emission associated with the Small Magellanic Cloud (SMC), through the combination of data from the Australian Square Kilometre Array Pathfinder (ASKAP) and Parkes (Murriyang), as part of the Galactic Australian Square Kilometre Array Pathfinder (GASKAP) pilot survey. These GASKAP-HI pilot observations, for the first time, reveal HI in the SMC on similar physical scales as other important tracers of the interstellar medium, such as molecular gas and dust. The resultant image cube possesses an rms noise level of 1.1 K (1.6 mJy/beam) per 0.98 km s$^{-1}$ spectral channel with an angular resolution of 30$''$ ($\sim$10 pc). We discuss the calibration scheme and the custom imaging pipeline that utilizes a joint deconvolution approach, efficiently distributed across a computing cluster, to accurately recover the emission extending across the entire $\sim$25 deg$^2$ field-of-view. We provide an overview of the data products and characterize several aspects including the noise properties as a function of angular resolution and the represented spatial scales by deriving the global transfer function over the full spectral range. A preliminary spatial power spectrum analysis on individual spectral channels reveals that the power-law nature of the density distribution extends down to scales of 10 pc. We highlight the scientific potential of these data by comparing the properties of an outflowing high velocity cloud with previous ASKAP+Parkes HI test observations., Comment: Accepted for publication in PASA, 34 pages, 18 figures, 5 tables

Published
2021
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4. The ASKAP Variables and Slow Transients (VAST) Pilot Survey

Author

Murphy, Tara, Kaplan, David L., Stewart, Adam J., O'Brien, Andrew, Lenc, Emil, Pintaldi, Sergio, Pritchard, Joshua, Dobie, Dougal, Fox, Archibald, Leung, James K., An, Tao, Bell, Martin E., Broderick, Jess W., Chatterjee, Shami, Dai, Shi, d'Antonio, Daniele, Doyle, J. Gerry, Gaensler, B. M., Heald, George, Horesh, Assaf, Jones, Megan L., McConnell, David, Moss, Vanessa A., Raja, Wasim, Ramsay, Gavin, Ryder, Stuart, Sadler, Elaine M., Sivakoff, Gregory R., Wang, Yuanming, Wang, Ziteng, Wheatland, Michael S., Whiting, Matthew, Allison, James R., Anderson, C. S., Ball, Lewis, Bannister, K., Bock, D. C. -J., Bolton, R., Bunton, J. D., Chekkala, R., Chippendale, A. P., Cooray, F. R., Gupta, N., Hayman, D. B., Jeganathan, K., Koribalski, B., Lee-Waddell, K., Mahony, Elizabeth K., Marvil, J., McClure-Griffiths, N. M., Mirtschin, P., Ng, A., Pearce, S., Phillips, C., and Voronkov, M. A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

The Variables and Slow Transients Survey (VAST) on the Australian Square Kilometre Array Pathfinder (ASKAP) is designed to detect highly variable and transient radio sources on timescales from 5 seconds to $\sim 5$ years. In this paper, we present the survey description, observation strategy and initial results from the VAST Phase I Pilot Survey. This pilot survey consists of $\sim 162$ hours of observations conducted at a central frequency of 888~MHz between 2019 August and 2020 August, with a typical rms sensitivity of 0.24~mJy~beam$^{-1}$ and angular resolution of $12-20$ arcseconds. There are 113 fields, \red{each of which was observed for 12 minutes integration time}, with between 5 and 13 repeats, with cadences between 1 day and 8 months. The total area of the pilot survey footprint is 5\,131 square degrees, covering six distinct regions of the sky. An initial search of two of these regions, totalling 1\,646 square degrees, revealed 28 highly variable and/or transient sources. Seven of these are known pulsars, including the millisecond pulsar J2039--5617. Another seven are stars, four of which have no previously reported radio detection (SCR~J0533--4257, LEHPM~2-783, UCAC3~89--412162 and 2MASS J22414436--6119311). Of the remaining 14 sources, two are active galactic nuclei, six are associated with galaxies and the other six have no multiwavelength counterparts and are yet to be identified.

Published
2021
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5. Australian Square Kilometre Array Pathfinder: I. System Description

Author

Hotan, A. W., Bunton, J. D., Chippendale, A. P., Whiting, M., Tuthill, J., Moss, V. A., McConnell, D., Amy, S. W., Huynh, M. T., Allison, J. R., Anderson, C. S., Bannister, K. W., Bastholm, E., Beresford, R., Bock, D. C. -J., Bolton, R., Chapman, J. M., Chow, K., Collier, J. D., Cooray, F. R., Cornwell, T. J., Diamond, P. J., Edwards, P. G., Feain, I. J., Franzen, T. M. O., George, D., Gupta, N., Hampson, G. A., Harvey-Smith, L., Hayman, D. B., Heywood, I., Jacka, C., Jackson, C. A., Jackson, S., Jeganathan, K., Johnston, S., Kesteven, M., Kleiner, D., Koribalski, B. S., Lee-Waddell, K., Lenc, E., Lensson, E. S., Mackay, S., Mahony, E. K., McClure-Griffiths, N. M., McConigley, R., Mirtschin, P., Ng, A. K., Norris, R. P., Pearce, S. E., Phillips, C., Pilawa, M. A., Raja, W., Reynolds, J. E., Roberts, P., Roxby, D. N., Sadler, E. M., Shields, M., Schinckel, A. E. T., Serra, P., Shaw, R. D., Sweetnam, T., Troup, E. R., Tzioumis, A., Voronkov, M. A., and Westmeier, T.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

In this paper we describe the system design and capabilities of the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope at the conclusion of its construction project and commencement of science operations. ASKAP is one of the first radio telescopes to deploy phased array feed (PAF) technology on a large scale, giving it an instantaneous field of view that covers 31 square degrees at 800 MHz. As a two-dimensional array of 36x12m antennas, with baselines ranging from 22m to 6km, ASKAP also has excellent snapshot imaging capability and 10 arcsecond resolution. This, combined with 288 MHz of instantaneous bandwidth and a unique third axis of rotation on each antenna, gives ASKAP the capability to create high dynamic range images of large sky areas very quickly. It is an excellent telescope for surveys between 700 MHz and 1800 MHz and is expected to facilitate great advances in our understanding of galaxy formation, cosmology and radio transients while opening new parameter space for discovery of the unknown., Comment: 38 pages, 24 figures, accepted for publication in PASA

Published
2021
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6. An ultra-wide bandwidth (704 to 4032 MHz) receiver for the Parkes radio telescope

Author

Hobbs, G., Manchester, R. N., Dunning, A., Jameson, A., Roberts, P., George, D., Green, J. A., Tuthill, J., Toomey, L., Kaczmarek, J. F., Mader, S., Marquarding, M., Ahmed, A., Amy, S. W., Bailes, M., Beresford, R., Bhat, N. D. R., Bock, D. C. -J., Bourne, M., Bowen, M., Brothers, M., Cameron, A. D., Carretti, E., Carter, N., Castillo, S., Chekkala, R., Cheng, W., Chung, Y., Craig, D. A., Dai, S., Dawson, J. R., Dempsey, J., Doherty, P., Dong, B., Edwards, P. G., Ergesh, T., Gao, X. Y., Han, J. L., Hayman, D. B., Indermuehle, B. T., Jeganathan, K., Johnston, S., Kanoniuk, H., Kesteven, M., Kramer, M., Leach, M., Mcintyre, V. J., Moss, V. A., Oslowski, S., Phillips, C. J., Pope, N. C., Preisig, B., Price, D. C., Reeves, K., Reilly, L., Reynolds, J. E., Robishaw, T., Roush, P., Ruckley, T., Sadler, E. M., Sarkissian, J., Severs, S., Shannon, R. M., Smart, K. W., Smith, M., Sobey, S. L. Smith. C., Staveley-Smith, L., Tzioumis, A. K., van Straten, W., Wang, N., Wen, L., and Whiting, M. T.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We describe an ultra-wide-bandwidth, low-frequency receiver ("UWL") recently installed on the Parkes radio telescope. The receiver system provides continuous frequency coverage from 704 to 4032 MHz. For much of the band (~60%) the system temperature is approximately 22K and the receiver system remains in a linear regime even in the presence of strong mobile phone transmissions. We discuss the scientific and technical aspects of the new receiver including its astronomical objectives, as well as the feed, receiver, digitiser and signal-processor design. We describe the pipeline routines that form the archive-ready data products and how those data files can be accessed from the archives. The system performance is quantified including the system noise and linearity, beam shape, antenna efficiency, polarisation calibration and timing stability., Comment: submitted to PASA

Published
2019
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7. A single fast radio burst localized to a massive galaxy at cosmological distance

Author

Bannister, K. W., Deller, A. T., Phillips, C., Macquart, J. -P., Prochaska, J. X., Tejos, N., Ryder, S. D., Sadler, E. M., Shannon, R. M., Simha, S., Day, C. K., McQuinn, M., North-Hickey, F. O., Bhandari, S., Arcus, W. R., Bennert, V. N., Burchett, J., Bouwhuis, M., Dodson, R., Ekers, R. D., Farah, W., Flynn, C., James, C. W., Kerr, M., Lenc, E., Mahony, E. K., O'Meara, J., Osłowski, S., Qiu, H., Treu, T., U, V., Bateman, T. J., Bock, D. C. -J., Bolton, R. J., Brown, A., Bunton, J. D., Chippendale, A. P., Cooray, F. R., Cornwell, T., Gupta, N., Hayman, D. B., Kesteven, M., Koribalski, B. S., MacLeod, A., McClure-Griffiths, N. M., Neuhold, S., Norris, R. P., Pilawa, M. A., Qiao, R. -Y., Reynolds, J., Roxby, D. N., Shimwell, T. W., Voronkov, M. A., and Wilson, C. D.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Fast Radio Bursts (FRBs) are brief radio emissions from distant astronomical sources. Some are known to repeat, but most are single bursts. Non-repeating FRB observations have had insufficient positional accuracy to localize them to an individual host galaxy. We report the interferometric localization of the single pulse FRB 180924 to a position 4 kpc from the center of a luminous galaxy at redshift 0.3214. The burst has not been observed to repeat. The properties of the burst and its host are markedly different from the only other accurately localized FRB source. The integrated electron column density along the line of sight closely matches models of the intergalactic medium, indicating that some FRBs are clean probes of the baryonic component of the cosmic web., Comment: Published online in Science 27 June 2019

Published
2019
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8. The Australian Square Kilometre Array Pathfinder: Performance of the Boolardy Engineering Test Array

Author

McConnell, D., Allison, J. R., Bannister, K., Bell, M. E., Bignall, H. E., Chippendale, A. P., Edwards, P. G., Harvey-Smith, L., Hegarty, S., Heywood, I., Hotan, A. W., Indermuehle, B. T., Lenc, E., Marvil, J., Popping, A., Raja, W., Reynolds, J. E., Sault, R. J., Serra, P., Voronkov, M. A., Whiting, M., Amy, S. W., Axtens, P., Ball, L., Bateman, T. J., Bock, D. C. -J., Bolton, R., Brodrick, D., Brothers, M., Brown, A. J., Bunton, J. D., Cheng, W., Cornwell, T., DeBoer, D., Feain, I., Gough, R., Gupta, N., Guzman, J. C., Hampson, G. A., Hay, S., Hayman, D. B., Hoyle, S., Humphreys, B., Jacka, C., Jackson, C. A., Jackson, S., Jeganathan, K., Joseph, J., Koribalski, B. S., Leach, M., Lensson, E. S., MacLeod, A., Mackay, S., Marquarding, M., McClure-Griffiths, N. M., Mirtschin, P., Mitchell, D., Neuhold, S., Ng, A., Norris, R., Pearce, S., Qiao, R. Y., Schinckel, A. E. T., Shields, M., Shimwell, T. W., Storey, M., Troup, E., Turner, B., Tuthill, J., Tzioumis, A., Wark, R. M., Westmeier, T., Wilson, C., and Wilson, T.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We describe the performance of the Boolardy Engineering Test Array (BETA), the prototype for the Australian Square Kilometre Array Pathfinder telescope ASKAP. BETA is the first aperture synthesis radio telescope to use phased array feed technology, giving it the ability to electronically form up to nine dual-polarization beams. We report the methods developed for forming and measuring the beams, and the adaptations that have been made to the traditional calibration and imaging procedures in order to allow BETA to function as a multi-beam aperture synthesis telescope. We describe the commissioning of the instrument and present details of BETA's performance: sensitivity, beam characteristics, polarimetric properties and image quality. We summarise the astronomical science that it has produced and draw lessons from operating BETA that will be relevant to the commissioning and operation of the final ASKAP telescope., Comment: Accepted for publication in PASA

Published
2016
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9. Recent Developments in Measuring Signal and Noise in Phased Array Feeds at CSIRO

Author

Chippendale, A. P., McConnell, D., Bannister, K., Nikolic, N., Hotan, A. W., Smart, K. W., Shaw, R. D., Hayman, D. B., and Hay, S. G.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We describe recent developments in measuring both signal and noise in phased array feeds for radio astronomy at CSIRO. We introduce new techniques including aperture array noise measurements with beamforming weights matched to a reflector's focal field. Weights are calculated via antenna-range and in-reflector measurements. We also describe the separation of system temperature and aperture efficiency via drift scans., Comment: 5 pages, 7 figures, accepted for publication in Antennas and Propagation (EuCAP), 2016 10th European Conference on (updated abstract)

Published
2016
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10. A pilot ASKAP survey of radio transient events in the region around the intermittent pulsar PSR J1107-5907

Author

Hobbs, G., Heywood, I., Bell, M. E., Kerr, M., Rowlinson, A., Johnston, S., Shannon, R. M., Voronkov, M. A., Ward, C., Banyer, J., Hancock, P. J., Murphy, Tara, Allison, J. R., Amy, S. W., Ball, L., Bannister, K., Bock, D. C. -J., Brodrick, D., Brothers, M., Brown, A. J., Bunton, J. D., Chapman, J., Chippendale, A. P., Chung, Y., DeBoer, D., Diamond, P., Edwards, P. G., Ekers, R., Ferris, R. H., Forsyth, R., Gough, R., Grancea, A., Gupta, N., Harvey-Smith, L., Hay, S., Hayman, D. B., Hotan, A. W., Hoyle, S., Humphreys, B., Indermuehle, B., Jacka, C. E., Jackson, C. A., Jackson, S., Jeganathan, K., Joseph, J, Kendall, R., Kiraly, D., Koribalski, B., Leach, M., Lenc, E., MacLeod, A., Mader, S., Marquarding, M., Marvil, J., McClure-Griffiths, N., McConnell, D., Mirtschin, P., Neuhold, S., Ng, A., Norris, R. P., O'Sullivan, J., Pearce, S., Phillips, C. J., Popping, A., Qiao, R. Y., Reynolds, J. E., Roberts, P., Sault, R. J., Schinckel, A. E. T., Serra, P., Shaw, R., Shimwell, T. W., Storey, M., Sweetnam, A. W., Tzioumis, A., Westmeier, T., Whiting, M., and Wilson, C. D.

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We use observations from the Boolardy Engineering Test Array (BETA) of the Australian Square Kilometre Array Pathfinder (ASKAP) telescope to search for transient radio sources in the field around the intermittent pulsar PSR J1107-5907. The pulsar is thought to switch between an "off" state in which no emission is detectable, a weak state and a strong state. We ran three independent transient detection pipelines on two-minute snapshot images from a 13 hour BETA observation in order to 1) study the emission from the pulsar, 2) search for other transient emission from elsewhere in the image and 3) to compare the results from the different transient detection pipelines. The pulsar was easily detected as a transient source and, over the course of the observations, it switched into the strong state three times giving a typical timescale between the strong emission states of 3.7 hours. After the first switch it remained in the strong state for almost 40 minutes. The other strong states lasted less than 4 minutes. The second state change was confirmed using observations with the Parkes radio telescope. No other transient events were found and we place constraints on the surface density of such events on these timescales. The high sensitivity Parkes observations enabled us to detect individual bright pulses during the weak state and to study the strong state over a wide observing band. We conclude by showing that future transient surveys with ASKAP will have the potential to probe the intermittent pulsar population., Comment: Accepted by MNRAS

Published
2015
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11. Measured Aperture-Array Noise Temperature of the Mark II Phased Array Feed for ASKAP

Author

Chippendale, A. P., Brown, A. J., Beresford, R. J., Hampson, G. A., Shaw, R. D., Hayman, D. B., Macleod, A., Forsyth, A. R., Hay, S. G., Leach, M., Cantrall, C., Brothers, M. L., and Hotan, A. W.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We have measured the aperture-array noise temperature of the first Mk. II phased array feed that CSIRO has built for the Australian Square Kilometre Array Pathfinder telescope. As an aperture array, the Mk. II phased array feed achieves a beam equivalent noise temperature less than 40 K from 0.78 GHz to 1.7 GHz and less than 50 K from 0.7 GHz to 1.8 GHz for a boresight beam directed at the zenith. We believe these are the lowest reported noise temperatures over these frequency ranges for ambient-temperature phased arrays. The measured noise temperature includes receiver electronics noise, ohmic losses in the array, and stray radiation from sidelobes illuminating the sky and ground away from the desired field of view. This phased array feed was designed for the Australian Square Kilometre Array Pathfinder to demonstrate fast astronomical surveys with a wide field of view for the Square Kilometre Array., Comment: 5 pages, 4 figures, accepted for publication in Antennas and Propagation (ISAP), 2015 International Symposium on

Published
2015

12. ASKAP HI imaging of the galaxy group IC 1459

Author

Serra, P., Koribalski, B., Kilborn, V., Allison, J. R., Amy, S. W., Ball, L., Bannister, K., Bell, M. E., Bock, D. C. -J., Bolton, R., Bowen, M., Boyle, B., Broadhurst, S., Brodrick, D., Brothers, M., Bunton, J. D., Chapman, J., Cheng, W., Chippendale, A. P., Chung, Y., Cooray, F., Cornwell, T., DeBoer, D., Diamond, P., Forsyth, R., Gough, R., Gupta, N., Hampson, G. A., Harvey-Smith, L., Hay, S., Hayman, D. B., Heywood, I., Hotan, A. W., Hoyle, S., Humphreys, B., Indermuehle, B., Jacka, C., Jackson, C. A., Jackson, S., Jeganathan, K., Johnston, S., Joseph, J, Kamphuis, P., Leach, M., Lenc, E., Lensson, E., Mackay, S., Marquarding, M., Marvil, J., McClure-Griffiths, N., McConnell, D., Meyer, M., Mirtschin, P., Neuhold, S., Ng, A., Norris, R. P., O'Sullivan, J., Pathikulangara, J., Pearce, S., Phillips, C., Popping, A., Qiao, R. Y., Reynolds, J. E., Roberts, P., Sault, R. J., Schinckel, A. E. T., Shaw, R., Shimwell, T. W., Staveley-Smith, L., Storey, M., Sweetnam, A. W., Troup, E., Tzioumis, A., Voronkov, M. A., Westmeier, T., Whiting, M., Wilson, C., Wong, O. I., and Wu, X.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We present HI imaging of the galaxy group IC 1459 carried out with six antennas of the Australian SKA Pathfinder equipped with phased-array feeds. We detect and resolve HI in eleven galaxies down to a column density of $\sim10^{20}$ cm$^{-2}$ inside a ~6 deg$^2$ field and with a resolution of ~1 arcmin on the sky and ~8 km/s in velocity. We present HI images, velocity fields and integrated spectra of all detections, and highlight the discovery of three HI clouds -- two in the proximity of the galaxy IC 5270 and one close to NGC 7418. Each cloud has an HI mass of $10^9$ M$_\odot$ and accounts for ~15% of the HI associated with its host galaxy. Available images at ultraviolet, optical and infrared wavelengths do not reveal any clear stellar counterpart of any of the clouds, suggesting that they are not gas-rich dwarf neighbours of IC 5270 and NGC 7418. Using Parkes data we find evidence of additional extended, low-column-density HI emission around IC 5270, indicating that the clouds are the tip of the iceberg of a larger system of gas surrounding this galaxy. This result adds to the body of evidence on the presence of intra-group gas within the IC 1459 group. Altogether, the HI found outside galaxies in this group amounts to several times $10^9$ M$_\odot$, at least 10% of the HI contained inside galaxies. This suggests a substantial flow of gas in and out of galaxies during the several billion years of the group's evolution., Comment: MNRAS accepted

Published
2015
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13. Discovery of HI gas in a young radio galaxy at $z = 0.44$ using the Australian Square Kilometre Array Pathfinder

Author

Allison, J. R., Sadler, E. M., Moss, V. A., Whiting, M. T., Hunstead, R. W., Pracy, M. B., Curran, S. J., Croom, S. M., Glowacki, M., Morganti, R., Shabala, S. S., Zwaan, M. A., Allen, G., Amy, S. W., Axtens, P., Ball, L., Bannister, K. W., Barker, S., Bell, M. E., Bock, D. C. -J., Bolton, R., Bowen, M., Boyle, B., Braun, R., Broadhurst, S., Brodrick, D., Brothers, M., Brown, A., Bunton, J. D., Cantrall, C., Chapman, J., Cheng, W., Chippendale, A. P., Chung, Y., Cooray, F., Cornwell, T., DeBoer, D., Diamond, P., Edwards, P. G., Ekers, R., Feain, I., Ferris, R. H., Forsyth, R., Gough, R., Grancea, A., Gupta, N., Guzman, J. C., Hampson, G., Harvey-Smith, L., Haskins, C., Hay, S., Hayman, D. B., Heywood, I., Hotan, A. W., Hoyle, S., Humphreys, B., Indermuehle, B. T., Jacka, C., Jackson, C., Jackson, S., Jeganathan, K., Johnston, S., Joseph, J., Kendall, R., Kesteven, M., Kiraly, D., Koribalski, B. S., Leach, M., Lenc, E., Lensson, E., Mackay, S., Macleod, A., Marquarding, M., Marvil, J., McClure-Griffiths, N., McConnell, D., Mirtschin, P., Norris, R. P., Neuhold, S., Ng, A., O'Sullivan, J., Pathikulangara, J., Pearce, S., Phillips, C., Popping, A., Qiao, R. Y., Reynolds, J. E., Roberts, P., Sault, R. J., Schinckel, A., Serra, P., Shaw, R., Shields, M., Shimwell, T., Storey, M., Sweetnam, T., Troup, E., Turner, B., Tuthill, J., Tzioumis, A., Voronkov, M. A., Westmeier, T., and Wilson, C. D.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We report the discovery of a new 21-cm HI absorption system using commissioning data from the Boolardy Engineering Test Array of the Australian Square Kilometre Array Pathfinder (ASKAP). Using the 711.5 - 1015.5 MHz band of ASKAP we were able to conduct a blind search for the 21-cm line in a continuous redshift range between $z = 0.4$ and 1.0, which has, until now, remained largely unexplored. The absorption line is detected at $z = 0.44$ towards the GHz-peaked spectrum radio source PKS B1740$-$517 and demonstrates ASKAP's excellent capability for performing a future wide-field survey for HI absorption at these redshifts. Optical spectroscopy and imaging using the Gemini-South telescope indicates that the HI gas is intrinsic to the host galaxy of the radio source. The narrow OIII emission lines show clear double-peaked structure, indicating either large-scale outflow or rotation of the ionized gas. Archival data from the \emph{XMM-Newton} satellite exhibit an absorbed X-ray spectrum that is consistent with a high column density obscuring medium around the active galactic nucleus. The HI absorption profile is complex, with four distinct components ranging in width from 5 to 300 km s$^{-1}$ and fractional depths from 0.2 to 20 per cent. In addition to systemic HI gas, in a circumnuclear disc or ring structure aligned with the radio jet, we find evidence for a possible broad outflow of neutral gas moving at a radial velocity of $v \sim 300$ km s$^{-1}$. We infer that the expanding young radio source ($t_{\rm age} \approx 2500$ yr) is cocooned within a dense medium and may be driving circumnuclear neutral gas in an outflow of $\sim$ 1 $\mathrm{M}_{\odot}$ yr$^{-1}$., Comment: 18 pages, 11 figures, accepted for publication in MNRAS

Published
2015
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14. WALLABY pilot survey: Public release of H i data for almost 600 galaxies from phase 1 of ASKAP pilot observations

Author

Westmeier, T., primary, Deg, N., additional, Spekkens, K., additional, Reynolds, T. N., additional, Shen, A. X., additional, Gaudet, S., additional, Goliath, S., additional, Huynh, M. T., additional, Venkataraman, P., additional, Lin, X., additional, O’Beirne, T., additional, Catinella, B., additional, Cortese, L., additional, Dénes, H., additional, Elagali, A., additional, For, B.-Q., additional, Józsa, G. I. G., additional, Howlett, C., additional, van der Hulst, J. M., additional, Jurek, R. J., additional, Kamphuis, P., additional, Kilborn, V. A., additional, Kleiner, D., additional, Koribalski, B. S., additional, Lee-Waddell, K., additional, Murugeshan, C., additional, Rhee, J., additional, Serra, P., additional, Shao, L., additional, Staveley-Smith, L., additional, Wang, J., additional, Wong, O. I., additional, Zwaan, M. A., additional, Allison, J. R., additional, Anderson, C. S., additional, Ball, Lewis, additional, Bock, D. C.-J., additional, Brodrick, D., additional, Bunton, J. D., additional, Cooray, F. R., additional, Gupta, N., additional, Hayman, D. B., additional, Mahony, E. K., additional, Moss, V. A., additional, Ng, A., additional, Pearce, S. E., additional, Raja, W., additional, Roxby, D. N., additional, Voronkov, M. A., additional, Warhurst, K. A., additional, Courtois, H. M., additional, and Said, K., additional

Published
2022
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15. GASKAP-HI pilot survey science I: ASKAP zoom observations of Hi emission in the Small Magellanic Cloud

Author

Pingel, N. M., primary, Dempsey, J., additional, McClure-Griffiths, N. M., additional, Dickey, J. M., additional, Jameson, K. E., additional, Arce, H., additional, Anglada, G., additional, Bland-Hawthorn, J., additional, Breen, S. L., additional, Buckland-Willis, F., additional, Clark, S. E., additional, Dawson, J. R., additional, Dénes, H., additional, Di Teodoro, E. M., additional, For, B.-Q., additional, Foster, Tyler J., additional, Gómez, J. F., additional, Imai, H., additional, Joncas, G., additional, Kim, C.-G., additional, Lee, M.-Y., additional, Lynn, C., additional, Leahy, D., additional, Ma, Y. K., additional, Marchal, A., additional, McConnell, D., additional, Miville-Deschènes, M.-A., additional, Moss, V. A., additional, Murray, C. E., additional, Nidever, D., additional, Peek, J., additional, Stanimirović, S., additional, Staveley-Smith, L., additional, Tepper-Garcia, T., additional, Tremblay, C. D., additional, Uscanga, L., additional, van Loon, J. Th., additional, Vázquez-Semadeni, E., additional, Allison, J. R., additional, Anderson, C. S., additional, Ball, Lewis, additional, Bell, M., additional, Bock, D. C.-J., additional, Bunton, J., additional, Cooray, F. R., additional, Cornwell, T., additional, Koribalski, B. S., additional, Gupta, N., additional, Hayman, D. B., additional, Harvey-Smith, L., additional, Lee-Waddell, K., additional, Ng, A., additional, Phillips, C. J., additional, Voronkov, M., additional, Westmeier, T., additional, and Whiting, M. T., additional

Published
2022
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16. The ASKAP Variables and Slow Transients (VAST) Pilot Survey

Author

Murphy, Tara, primary, Kaplan, David L., additional, Stewart, Adam J., additional, O’Brien, Andrew, additional, Lenc, Emil, additional, Pintaldi, Sergio, additional, Pritchard, Joshua, additional, Dobie, Dougal, additional, Fox, Archibald, additional, Leung, James K., additional, An, Tao, additional, Bell, Martin E., additional, Broderick, Jess W., additional, Chatterjee, Shami, additional, Dai, Shi, additional, d’Antonio, Daniele, additional, Doyle, Gerry, additional, Gaensler, B. M., additional, Heald, George, additional, Horesh, Assaf, additional, Jones, Megan L., additional, McConnell, David, additional, Moss, Vanessa A., additional, Raja, Wasim, additional, Ramsay, Gavin, additional, Ryder, Stuart, additional, Sadler, Elaine M., additional, Sivakoff, Gregory R., additional, Wang, Yuanming, additional, Wang, Ziteng, additional, Wheatland, Michael S., additional, Whiting, Matthew, additional, Allison, James R., additional, Anderson, C. S., additional, Ball, Lewis, additional, Bannister, K., additional, Bock, D. C.-J., additional, Bolton, R., additional, Bunton, J. D., additional, Chekkala, R., additional, Chippendale, A. P, additional, Cooray, F. R., additional, Gupta, N., additional, Hayman, D. B., additional, Jeganathan, K., additional, Koribalski, B., additional, Lee-Waddell, K., additional, Mahony, Elizabeth K., additional, Marvil, J., additional, McClure-Griffiths, N. M., additional, Mirtschin, P., additional, Ng, A., additional, Pearce, S., additional, Phillips, C., additional, and Voronkov, M. A., additional

Published
2021
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17. Australian square kilometre array pathfinder: I. system description

Author

Hotan, A. W., primary, Bunton, J. D., additional, Chippendale, A. P., additional, Whiting, M., additional, Tuthill, J., additional, Moss, V. A., additional, McConnell, D., additional, Amy, S. W., additional, Huynh, M. T., additional, Allison, J. R., additional, Anderson, C. S., additional, Bannister, K. W., additional, Bastholm, E., additional, Beresford, R., additional, Bock, D. C.-J., additional, Bolton, R., additional, Chapman, J. M., additional, Chow, K., additional, Collier, J. D., additional, Cooray, F. R., additional, Cornwell, T. J., additional, Diamond, P. J., additional, Edwards, P. G., additional, Feain, I. J., additional, Franzen, T. M. O., additional, George, D., additional, Gupta, N., additional, Hampson, G. A., additional, Harvey-Smith, L., additional, Hayman, D. B., additional, Heywood, I., additional, Jacka, C., additional, Jackson, C. A., additional, Jackson, S., additional, Jeganathan, K., additional, Johnston, S., additional, Kesteven, M., additional, Kleiner, D., additional, Koribalski, B. S., additional, Lee-Waddell, K., additional, Lenc, E., additional, Lensson, E. S., additional, Mackay, S., additional, Mahony, E. K., additional, McClure-Griffiths, N. M., additional, McConigley, R., additional, Mirtschin, P., additional, Ng, A. K., additional, Norris, R. P., additional, Pearce, S. E., additional, Phillips, C., additional, Pilawa, M. A., additional, Raja, W., additional, Reynolds, J. E., additional, Roberts, P., additional, Roxby, D. N., additional, Sadler, E. M., additional, Shields, M., additional, Schinckel, A. E. T., additional, Serra, P., additional, Shaw, R. D., additional, Sweetnam, T., additional, Troup, E. R., additional, Tzioumis, A., additional, Voronkov, M. A., additional, and Westmeier, T., additional

Published
2021
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18. A single fast radio burst localized to a massive galaxy at cosmological distance

Author

Bannister, K. W., primary, Deller, A. T., additional, Phillips, C., additional, Macquart, J.-P., additional, Prochaska, J. X., additional, Tejos, N., additional, Ryder, S. D., additional, Sadler, E. M., additional, Shannon, R. M., additional, Simha, S., additional, Day, C. K., additional, McQuinn, M., additional, North-Hickey, F. O., additional, Bhandari, S., additional, Arcus, W. R., additional, Bennert, V. N., additional, Burchett, J., additional, Bouwhuis, M., additional, Dodson, R., additional, Ekers, R. D., additional, Farah, W., additional, Flynn, C., additional, James, C. W., additional, Kerr, M., additional, Lenc, E., additional, Mahony, E. K., additional, O’Meara, J., additional, Osłowski, S., additional, Qiu, H., additional, Treu, T., additional, U, V., additional, Bateman, T. J., additional, Bock, D. C.-J., additional, Bolton, R. J., additional, Brown, A., additional, Bunton, J. D., additional, Chippendale, A. P., additional, Cooray, F. R., additional, Cornwell, T., additional, Gupta, N., additional, Hayman, D. B., additional, Kesteven, M., additional, Koribalski, B. S., additional, MacLeod, A., additional, McClure-Griffiths, N. M., additional, Neuhold, S., additional, Norris, R. P., additional, Pilawa, M. A., additional, Qiao, R.-Y., additional, Reynolds, J., additional, Roxby, D. N., additional, Shimwell, T. W., additional, Voronkov, M. A., additional, and Wilson, C. D., additional

Published
2019
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19. The Detection of an Extremely Bright Fast Radio Burst in a Phased Array Feed Survey

Author

Bannister, K. W., primary, Shannon, R. M., additional, Macquart, J.-P., additional, Flynn, C., additional, Edwards, P. G., additional, O’Neill, M., additional, Osłowski, S., additional, Bailes, M., additional, Zackay, B., additional, Clarke, N., additional, D’Addario, L. R., additional, Dodson, R., additional, Hall, P. J., additional, Jameson, A., additional, Jones, D., additional, Navarro, R., additional, Trinh, J. T., additional, Allison, J., additional, Anderson, C. S., additional, Bell, M., additional, Chippendale, A. P., additional, Collier, J. D., additional, Heald, G., additional, Heywood, I., additional, Hotan, A. W., additional, Lee-Waddell, K., additional, Madrid, J. P., additional, Marvil, J., additional, McConnell, D., additional, Popping, A., additional, Voronkov, M. A., additional, Whiting, M. T., additional, Allen, G. R., additional, Bock, D. C.-J., additional, Brodrick, D. P., additional, Cooray, F., additional, DeBoer, D. R., additional, Diamond, P. J., additional, Ekers, R., additional, Gough, R. G., additional, Hampson, G. A., additional, Harvey-Smith, L., additional, Hay, S. G., additional, Hayman, D. B., additional, Jackson, C. A., additional, Johnston, S., additional, Koribalski, B. S., additional, McClure-Griffiths, N. M., additional, Mirtschin, P., additional, Ng, A., additional, Norris, R. P., additional, Pearce, S. E., additional, Phillips, C. J., additional, Roxby, D. N., additional, Troup, E. R., additional, and Westmeier, T., additional

Published
2017
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21. A pilot ASKAP survey of radio transient events in the region around the intermittent pulsar PSR J1107−5907

Author

Hobbs, G., primary, Heywood, I., additional, Bell, M. E., additional, Kerr, M., additional, Rowlinson, A., additional, Johnston, S., additional, Shannon, R. M., additional, Voronkov, M. A., additional, Ward, C., additional, Banyer, J., additional, Hancock, P. J., additional, Murphy, Tara, additional, Allison, J. R., additional, Amy, S. W., additional, Ball, L., additional, Bannister,  K., additional, Bock, D. C.-J., additional, Brodrick, D., additional, Brothers, M., additional, Brown, A. J., additional, Bunton, J. D., additional, Chapman, J., additional, Chippendale, A. P., additional, Chung, Y., additional, DeBoer, D., additional, Diamond, P., additional, Edwards, P. G., additional, Ekers, R., additional, Ferris, R. H., additional, Forsyth, R., additional, Gough, R., additional, Grancea, A., additional, Gupta, N., additional, Harvey-Smith, L., additional, Hay, S., additional, Hayman, D. B., additional, Hotan, A. W., additional, Hoyle, S., additional, Humphreys, B., additional, Indermuehle, B., additional, Jacka, C. E., additional, Jackson, C. A., additional, Jackson, S., additional, Jeganathan, K., additional, Joseph, J, additional, Kendall, R., additional, Kiraly, D., additional, Koribalski, B., additional, Leach, M., additional, Lenc, E., additional, MacLeod, A., additional, Mader, S., additional, Marquarding, M., additional, Marvil, J., additional, McClure-Griffiths, N., additional, McConnell, D., additional, Mirtschin, P., additional, Neuhold, S., additional, Ng, A., additional, Norris, R. P., additional, O'Sullivan, J., additional, Pearce, S., additional, Phillips, C. J., additional, Popping, A., additional, Qiao, R. Y., additional, Reynolds, J. E., additional, Roberts, P., additional, Sault, R. J., additional, Schinckel, A. E. T., additional, Serra, P., additional, Shaw, R., additional, Shimwell, T. W., additional, Storey, M., additional, Sweetnam, A. W., additional, Tzioumis, A., additional, Westmeier, T., additional, Whiting, M., additional, and Wilson, C. D., additional

Published
2016
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22. The Australian Square Kilometre Array Pathfinder: Performance of the Boolardy Engineering Test Array

Author

McConnell, D., primary, Allison, J. R., additional, Bannister, K., additional, Bell, M. E., additional, Bignall, H. E., additional, Chippendale, A. P., additional, Edwards, P. G., additional, Harvey-Smith, L., additional, Hegarty, S., additional, Heywood, I., additional, Hotan, A. W., additional, Indermuehle, B. T., additional, Lenc, E., additional, Marvil, J., additional, Popping, A., additional, Raja, W., additional, Reynolds, J. E., additional, Sault, R. J., additional, Serra, P., additional, Voronkov, M. A., additional, Whiting, M., additional, Amy, S. W., additional, Axtens, P., additional, Ball, L., additional, Bateman, T. J., additional, Bock, D. C.-J., additional, Bolton, R., additional, Brodrick, D., additional, Brothers, M., additional, Brown, A. J., additional, Bunton, J. D., additional, Cheng, W., additional, Cornwell, T., additional, DeBoer, D., additional, Feain, I., additional, Gough, R., additional, Gupta, N., additional, Guzman, J. C., additional, Hampson, G. A., additional, Hay, S., additional, Hayman, D. B., additional, Hoyle, S., additional, Humphreys, B., additional, Jacka, C., additional, Jackson, C. A., additional, Jackson, S., additional, Jeganathan, K., additional, Joseph, J., additional, Koribalski, B. S., additional, Leach, M., additional, Lensson, E. S., additional, MacLeod, A., additional, Mackay, S., additional, Marquarding, M., additional, McClure-Griffiths, N. M., additional, Mirtschin, P., additional, Mitchell, D., additional, Neuhold, S., additional, Ng, A., additional, Norris, R., additional, Pearce, S., additional, Qiao, R. Y., additional, Schinckel, A. E. T., additional, Shields, M., additional, Shimwell, T. W., additional, Storey, M., additional, Troup, E., additional, Turner, B., additional, Tuthill, J., additional, Tzioumis, A., additional, Wark, R. M., additional, Westmeier, T., additional, Wilson, C., additional, and Wilson, T., additional

Published
2016
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23. Erratum: Discovery of H i gas in a young radio galaxy at $\boldsymbol {z = 0.44}$ using the Australian Square Kilometre Array Pathfinder

Author

Allison, J. R., primary, Sadler, E. M., additional, Moss, V. A., additional, Whiting, M. T., additional, Hunstead, R. W., additional, Pracy, M. B., additional, Curran, S. J., additional, Croom, S. M., additional, Glowacki, M., additional, Morganti, R., additional, Shabala, S. S., additional, Zwaan, M. A., additional, Allen, G., additional, Amy, S. W., additional, Axtens, P., additional, Ball, L., additional, Bannister, K. W., additional, Barker, S., additional, Bell, M. E., additional, Bock, D. C.-J., additional, Bolton, R., additional, Bowen, M., additional, Boyle, B., additional, Braun, R., additional, Broadhurst, S., additional, Brodrick, D., additional, Brothers, M., additional, Brown, A., additional, Bunton, J. D., additional, Cantrall, C., additional, Chapman, J., additional, Cheng, W., additional, Chippendale, A. P., additional, Chung, Y., additional, Cooray, F., additional, Cornwell, T., additional, DeBoer, D., additional, Diamond, P., additional, Edwards, P. G., additional, Ekers, R., additional, Feain, I., additional, Ferris, R. H., additional, Forsyth, R., additional, Gough, R., additional, Grancea, A., additional, Gupta, N., additional, Guzman, J. C., additional, Hampson, G., additional, Harvey-Smith, L., additional, Haskins, C., additional, Hay, S., additional, Hayman, D. B., additional, Heywood, I., additional, Hotan, A. W., additional, Hoyle, S., additional, Humphreys, B., additional, Indermuehle, B. T., additional, Jacka, C., additional, Jackson, C., additional, Jackson, S., additional, Jeganathan, K., additional, Johnston, S., additional, Joseph, J., additional, Kendall, R., additional, Kesteven, M., additional, Kiraly, D., additional, Koribalski, B. S., additional, Leach, M., additional, Lenc, E., additional, Lensson, E., additional, Mackay, S., additional, Macleod, A., additional, Marquarding, M., additional, Marvil, J., additional, McClure-Griffiths, N., additional, McConnell, D., additional, Mirtschin, P., additional, Norris, R. P., additional, Neuhold, S., additional, Ng, A., additional, O'Sullivan, J., additional, Pathikulangara, J., additional, Pearce, S., additional, Phillips, C., additional, Popping, A., additional, Qiao, R. Y., additional, Reynolds, J. E., additional, Roberts, P., additional, Sault, R. J., additional, Schinckel, A., additional, Serra, P., additional, Shaw, R., additional, Shields, M., additional, Shimwell, T., additional, Storey, M., additional, Sweetnam, T., additional, Troup, E., additional, Turner, B., additional, Tuthill, J., additional, Tzioumis, A., additional, Voronkov, M. A., additional, Westmeier, T., additional, and Wilson, C. D., additional

Published
2015
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24. Discovery of H i gas in a young radio galaxy at z = 0.44 using the Australian Square Kilometre Array Pathfinder

Author

Allison, J. R., primary, Sadler, E. M., additional, Moss, V. A., additional, Whiting, M. T., additional, Hunstead, R. W., additional, Pracy, M. B., additional, Curran, S. J., additional, Croom, S. M., additional, Glowacki, M., additional, Morganti, R., additional, Shabala, S. S., additional, Zwaan, M. A., additional, Allen, G., additional, Amy, S. W., additional, Axtens, P., additional, Ball, L., additional, Bannister, K. W., additional, Barker, S., additional, Bell, M. E., additional, Bock, D. C.-J., additional, Bolton, R., additional, Bowen, M., additional, Boyle, B., additional, Braun, R., additional, Broadhurst, S., additional, Brodrick, D., additional, Brothers, M., additional, Brown, A., additional, Bunton, J. D., additional, Cantrall, C., additional, Chapman, J., additional, Cheng, W., additional, Chippendale, A. P., additional, Chung, Y., additional, Cooray, F., additional, Cornwell, T., additional, DeBoer, D., additional, Diamond, P., additional, Edwards, P. G., additional, Ekers, R., additional, Feain, I., additional, Ferris, R. H., additional, Forsyth, R., additional, Gough, R., additional, Grancea, A., additional, Gupta, N., additional, Guzman, J. C., additional, Hampson, G., additional, Harvey-Smith, L., additional, Haskins, C., additional, Hay, S., additional, Hayman, D. B., additional, Heywood, I., additional, Hotan, A. W., additional, Hoyle, S., additional, Humphreys, B., additional, Indermuehle, B. T., additional, Jacka, C., additional, Jackson, C., additional, Jackson, S., additional, Jeganathan, K., additional, Johnston, S., additional, Joseph, J., additional, Kendall, R., additional, Kesteven, M., additional, Kiraly, D., additional, Koribalski, B. S., additional, Leach, M., additional, Lenc, E., additional, Lensson, E., additional, Mackay, S., additional, Macleod, A., additional, Marquarding, M., additional, Marvil, J., additional, McClure-Griffiths, N., additional, McConnell, D., additional, Mirtschin, P., additional, Norris, R. P., additional, Neuhold, S., additional, Ng, A., additional, O'Sullivan, J., additional, Pathikulangara, J., additional, Pearce, S., additional, Phillips, C., additional, Popping, A., additional, Qiao, R. Y., additional, Reynolds, J. E., additional, Roberts, P., additional, Sault, R. J., additional, Schinckel, A., additional, Serra, P., additional, Shaw, R., additional, Shields, M., additional, Shimwell, T., additional, Storey, M., additional, Sweetnam, T., additional, Troup, E., additional, Turner, B., additional, Tuthill, J., additional, Tzioumis, A., additional, Voronkov, M. A., additional, Westmeier, T., additional, and Wilson, C. D., additional

Published
2015
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25. ASKAP H i imaging of the galaxy group IC 1459

Author

Serra, P., primary, Koribalski, B., additional, Kilborn, V., additional, Allison, J. R., additional, Amy, S. W., additional, Ball, L., additional, Bannister, K., additional, Bell, M. E., additional, Bock, D. C.-J., additional, Bolton, R., additional, Bowen, M., additional, Boyle, B., additional, Broadhurst, S., additional, Brodrick, D., additional, Brothers, M., additional, Bunton, J. D., additional, Chapman, J., additional, Cheng, W., additional, Chippendale, A. P., additional, Chung, Y., additional, Cooray, F., additional, Cornwell, T., additional, DeBoer, D., additional, Diamond, P., additional, Forsyth, R., additional, Gough, R., additional, Gupta, N., additional, Hampson, G. A., additional, Harvey-Smith, L., additional, Hay, S., additional, Hayman, D. B., additional, Heywood, I., additional, Hotan, A. W., additional, Hoyle, S., additional, Humphreys, B., additional, Indermuehle, B., additional, Jacka, C., additional, Jackson, C. A., additional, Jackson, S., additional, Jeganathan, K., additional, Johnston, S., additional, Joseph, J., additional, Kamphuis, P., additional, Leach, M., additional, Lenc, E., additional, Lensson, E., additional, Mackay, S., additional, Marquarding, M., additional, Marvil, J., additional, McClure-Griffiths, N., additional, McConnell, D., additional, Meyer, M., additional, Mirtschin, P., additional, Neuhold, S., additional, Ng, A., additional, Norris, R. P., additional, O'Sullivan, J., additional, Pathikulangara, J., additional, Pearce, S., additional, Phillips, C., additional, Popping, A., additional, Qiao, R. Y., additional, Reynolds, J. E., additional, Roberts, P., additional, Sault, R. J., additional, Schinckel, A. E. T., additional, Shaw, R., additional, Shimwell, T. W., additional, Staveley-Smith, L., additional, Storey, M., additional, Sweetnam, A. W., additional, Troup, E., additional, Tzioumis, A., additional, Voronkov, M. A., additional, Westmeier, T., additional, Whiting, M., additional, Wilson, C., additional, Wong, O. I., additional, and Wu, X., additional

Published
2015
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27. Measured aperture-array noise temperature of the Mark II phased array feed for ASKAP

Author

Aaron Chippendale, Brown, A. J., Beresford, R. J., Hampson, G. A., Shaw, R. D., Hayman, D. B., Macleod, A., Forsyth, A. R., Hay, S. G., Leach, M., Cantrall, C., Brothers, M. L., and Hotan, A. W.

Subjects
Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract

We have measured the aperture-array noise temperature of the first Mk. II phased array feed that CSIRO has built for the Australian Square Kilometre Array Pathfinder telescope. As an aperture array, the Mk. II phased array feed achieves a beam equivalent noise temperature less than 40 K from 0.78 GHz to 1.7 GHz and less than 50 K from 0.7 GHz to 1.8 GHz for a boresight beam directed at the zenith. We believe these are the lowest reported noise temperatures over these frequency ranges for ambient-temperature phased arrays. The measured noise temperature includes receiver electronics noise, ohmic losses in the array, and stray radiation from sidelobes illuminating the sky and ground away from the desired field of view. This phased array feed was designed for the Australian Square Kilometre Array Pathfinder to demonstrate fast astronomical surveys with a wide field of view for the Square Kilometre Array., Comment: 5 pages, 4 figures, accepted for publication in Antennas and Propagation (ISAP), 2015 International Symposium on

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