Effect of d-Dimensional Re-orderings on Lossless Compression of Radio-Astronomy and Digital Elevation Data by Conrad J. Haupt, Ekow J. Otoo, Ling Cheng

“…We investigate the impact of three SFCs on Shuttle Radar Topographic Mission (SRTM) elevation data and Square-Kilometre Array telescope (SKA) radio-astronomy data: two types of datasets to which SFCs have not been extensively applied, within a compression context. …”
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Gravitational waves from a supercooled electroweak phase transition and their detection with pulsar timing arrays by Archil Kobakhidze, Cyril Lagger, Adrian Manning, Jason Yue

“…Our computation shows that there exists a range of parameters for which the gravitational wave spectrum lies at the edge between the exclusion limits of current pulsar timing array experiments and the detection band of the future Square Kilometre Array observatory.…”
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WALLABY early science - III. An HI study of the spiral galaxy NGC 1566 by Elagali, A, Staveley-Smith, L, Rhee, J, Wong, O, Bosma, A, Westmeier, T, Koribalski, BS, Heald, G, For, BQ, Kleiner, D, Lee-Waddell, K, Madrid, JP, Popping, A, Reynolds, TN, Meyer, MJ, Allison, JR, Lagos, CDP, Voronkov, MA, Serra, P, Shao, L, Wang, J, Anderson, CS, Bunton, JD, Bekiaris, G, Walsh, VM, Kilborn, VA, Kamphuis, P, Oh, SH

“…This paper reports on the atomic hydrogen gas (H I) observations of the spiral galaxy NGC 1566 using the newly commissioned Australian Square Kilometre Array Pathfinder radio telescope. We measure an integrated H I flux density of 180.2 Jy km s−1 emanating from this galaxy, which translates to an H I mass of 1.94×1010M⊙ at an assumed distance of 21.3 Mpc. …”

Formation of double neutron star systems by Tauris, T, Kramer, M, Freire, P, Wex, N, Janka, H, Langer, N, Podsiadlowski, P, Bozzo, E, Chaty, S, Kruckow, M, Heuvel, E, Antoniadis, J, Breton, R, Champion, D

“…Large numbers of DNS systems and their mergers are anticipated to be discovered using the Square-Kilometre-Array searching for radio pulsars and high-frequency gravitational wave detectors (LIGO/VIRGO), respectively. …”

The VLBA CANDELS GOODS-North Survey – I. survey design, processing, data products, and source counts by Deane, RP, Radcliffe, JF, Njeri, A, Akoto-Danso, A, Bernardi, G, Smirnov, OM, Beswick, R, Garrett, MA, Jarvis, MJ, Whittam, IH, Bourke, S, Paragi, Z

“…This survey approach will assist in deriving robust VLBI source counts and broadening the discovery space for future wide-field VLBI surveys, including VLBI with the Square Kilometre Array, which will include new large field-of-view antennas on the African continent at ≳1000 km baselines. …”

A semi-empirical simulation of the extragalactic radio continuum sky for next generation radio telescopes by Wilman, R, Miller, L, Jarvis, M, Mauch, T, Levrier, F, Abdalla, F, Rawlings, S, Kloeckner, H, Obreschkow, D, Olteanu, D, Young, S

“…We have developed a semi-empirical simulation of the extragalactic radio continuum sky suitable for aiding the design of next generation radio interferometers such as the Square Kilometre Array (SKA). The emphasis is on modelling the large-scale cosmological distribution of radio sources rather than the internal details of individual galaxies. …”

High-performance signal processing architectures for digital aperture array telescopes by Armstrong, R, Richard Paul Armstrong

“…<p>An instrument with the ability to image neutral atomic hydrogen (HI) to cosmic redshift will allow the fundamental properties of the Universe to be more precisely determined; in particular the distribution, composition, and evolutionary history of its matter and energy. The Square Kilometre Array (SKA) is a radio survey telescope conceived with this aim. …”

Discovery of PSR J0523-7125 as a circularly polarized variable radio source in the Large Magellanic Cloud by Wang, Y, Murphy, T, Kaplan, DL, Klinner-Teo, T, Ridolfi, A, Bailes, M, Crawford, F, Dai, S, Dobie, D, Gaensler, BM, Graber, V, Heywood, I, Lenc, E, Lorimer, DR, McLaughlin, MA, O'Brien, A, Pintaldi, S, Pritchard, J, Rea, N, Ridley, JP, Ronchi, M, Shannon, RM, Sivakoff, GR, Stewart, A, Wang, Z, Zic, A

“…We report the discovery of a highly circularly polarized, variable, steep-spectrum pulsar in the Australian Square Kilometre Array Pathfinder (ASKAP) Variables and Slow Transients (VAST) survey. …”

Probing the accelerating Universe with radio weak lensing in the JVLA Sky Survey by Brown, M, Abdalla, F, Amara, A, Bacon, D, Battye, R, Bell, MR, Beswick, R, Birkinshaw, M, Böhm, V, Bridle, S, Browne, I, Casey, C, Demetroullas, C, lin, T, Ferreira, P, Garrington, S, Grainge, K, Gray, M, Hales, C, Harrison, I, Heavens, A, Heymans, C, Hung, C, Jackson, N, Jarvis, M, Joachimi, B, Kay, S, Kitching, T, Leahy, J, Maartens, R, Miller, L, Muxlow, T, Myers, S, Nichol, R, Patel, P, Pritchard, JR, Raccanelli, A, Refregier, A, Richards, A, Riseley, C, Santos, MG, Scaife, A, Schäfer, B, Schilizzi, RT, Smail, I, Starck, J, Szepietowski, R, Taylor, A, Whittaker, L, Wrigley, N, Zuntz, J

“…Such a survey will build on the unique strengths of the JVLA and will remain unsurpassed in terms of its combination of resolution and sensitivity until the advent of the Square Kilometre Array. We identify the best fields on the JVLA-accessible sky from the point of view of overlapping with existing deep optical and near infra-red data which will provide crucial redshift information and facilitate a host of additional compelling multi-wavelength science.…”

WALLABY early science – I. The NGC 7162 galaxy group by Reynolds, T, Westmeier, T, Staveley-Smith, L, Elagali, A, For, B, Kleiner, D, Koribalski, B, Lee-Waddell, K, Madrid, J, Popping, A, Rhee, J, Whiting, M, Wong, O, Davies, L, Driver, S, Robotham, A, Allison, J, Bekiaris, G, Collier, J, Heald, G, Meyer, M, Chippendale, A, Macleod, A, Voronkov, M

“…We present Widefield ASKAP L-band Legacy All-sky Blind Survey (WALLABY) early science results from the Australian Square Kilometre Array Pathfinder (ASKAP) observations of the NGC 7162 galaxy group. …”

ASKAP commissioning observations of the GAMA 23 field by Leahy, DA, Hopkins, AM, Norris, RP, Marvil, J, Collier, JD, Taylor, EN, Allison, JR, Anderson, C, Bell, M, Bilicki, M, Bland-Hawthorn, J, Brough, S, Brown, MJI, Driyer, S, Gurkan, G, Haryey-Smith, L, Heywood, I, Holwerda, BW, Liske, J, Lopez-Sanchez, AR, McConnell, D, Moffett, A, Owers, MS, Pimbblet, KA, Raja, W, Seymour, N, Voronkov, MA, Wang, L

“…We have observed the G23 field of the Galaxy AndMass Assembly (GAMA) survey using the Australian Square Kilometre Array Pathfinder (ASKAP) in its commissioning phase to validate the performance of the telescope and to characterise the detected galaxy populations. …”

Forecasts for Dark Energy Measurements with Future HI Surveys by Abdalla, F, Blake, C, Rawlings, S

“…We find that a radio synthesis array with about 10 per cent of the collecting area of the Square Kilometre Array (SKA), equipped with a wide ($10-100 ~ {\rm deg}^2$) field-of-view, would have the capacity to perform a $20{,}000 ~ {\rm deg}^2$ redshift survey to a maximum redshift $z_{\rm max} \sim 0.8$ and thereby produce dark energy measurements that are competitive with surveys likely to be undertaken by optical telescopes around 2015. …”

Limits on fast radio bursts at 145 MHz with ARTEMIS, a real-time software backend by Karastergiou, A, Chennamangalam, J, Armour, W, Williams, C, Mort, B, Dulwich, F, Salvini, S, Magro, A, Roberts, S, Serylak, M, Doo, A, Bilous, A, Breton, R, Falcke, H, Griessmeier, J, Hessels, J, Keane, E, Kondratiev, V, Kramer, M, van Leeuwen, J, Noutsos, A, Oslowski, S, Sobey, C, Stappers, B, Weltevrede, P

“…Our results suggest that surveys at higher frequencies, including the low frequency component of the Square Kilometre Array, will have better chances to detect, estimate rates and understand the origin and properties of FRBs.…”

The Lockman Hole Project: new constraints on the sub-mJy source counts from a wide-area 1.4 GHz mosaic by Prandoni, I, Guglielmino, G, Morganti, R, Vaccari, M, Maini, A, Rottgering, H, Jarvis, M, Garrett, M

“…A clear excess is found with respect to the counts predicted by the semi-empirical radio sky simulations developed in the framework of the Square Kilometre Array Simulated Skies project. A preliminary analysis of the identified (and classified) sources suggests this excess is to be ascribed to star-forming galaxies, which seem to show a steeper evolution than predicted.…”

The ASKAP Variables and Slow Transients (VAST) Pilot Survey by Murphy, T, Kaplan, DL, Stewart, AJ, O'Brien, A, Lenc, E, Pintaldi, S, Pritchard, J, Dobie, D, Fox, A, Leung, JK, An, T, Bell, ME, Broderick, JW, Chatterjee, S, Dai, S, d'Antonio, D, Doyle, JG, Gaensler, BM, Heald, G, Horesh, A, Jones, ML, McConnell, D, Moss, VA, Raja, W, Ramsay, G, Ryder, S, Sadler, EM, Sivakoff, GR, Wang, Y, Wang, Z, Wheatland, MS, Whiting, M, Allison, JR, Anderson, CS, Ball, L, Bannister, K, Bock, DC-J, Bolton, R, Bunton, JD, Chekkala, R, Chippendale, AP, Cooray, FR, Gupta, N, Hayman, DB, Jeganathan, K, Koribalski, B, Lee-Waddell, K, Mahony, EK, Marvil, J, McClure-Griffiths, NM, Mirtschin, P, Ng, A, Pearce, S, Phillips, C, Voronkov, MA

“…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 s to ~5 yr. …”

Accretion and star formation in quasars by White, S

“…They also have important implications for modelling radio populations below 1mJy, which is necessary for the development of the Square Kilometre Array.</p>…”

Polarized point sources in the LOFAR Two-meter Sky Survey: A preliminary catalog by Van Eck, C, Haverkorn, M, Alves, M, Beck, R, Best, P, Carretti, E, Chyzy, K, Farnes, J, Ferriere, K, Hardcastle, M, Heald, G, Horellou, C, Iacobelli, M, Jelic, V, Mulcahy, D, O'Sullivan, S, Polderman, I, Reich, W, Riseley, C, Roettgering, H, Schnitzeler, D, Shimwell, T, Vacca, V, Vink, J, White, G

“…The polarization properties of radio sources at very low frequencies (&lt;200 MHz) have not been widely measured, but the new generation of low-frequency radio telescopes, including the Low Frequency Array (LOFAR: a Square Kilometre Array Low pathfinder), now gives us the opportunity to investigate these properties. …”

High-velocity OH megamasers in IRAS 20100−4156: evidence for a supermassive black hole by Harvey-Smith, L, Allison, J, Green, J, Bannister, K, Chippendale, A, Edwards, P, Heywood, I, Hotan, A, Lenc, E, Marvil, J, McConnell, D, Phillips, C, Sault, R, Serra, P, Stevens, J, Voronkov, M, Whiting, M

“…Results from the Australian Square Kilometre Array Pathfinder (ASKAP)'s Boolardy Engineering Test Array (BETA) and the Australia Telescope Compact Array (ATCA) provide two independent measurements of the OH megamaser spectrum. …”

Illuminating the past 8 billion years of cold gas towards two gravitationally lensed quasars by Allison, J, Moss, V, Macquart, J, Curran, S, Duchesne, S, Mahony, E, Sadler, E, Whiting, M, Bannister, K, Chippendale, A, Edwards, P, Harvey-Smith, L, Heywood, I, Indermuehle, B, Lenc, E, Marvil, J, McConnell, D, Sault, R

“…Using the Boolardy Engineering Test Array of the Australian Square Kilometre Array Pathfinder (ASKAP BETA), we have carried out the first z = 0–1 survey for H I and OH absorption towards the gravitationally lensed quasars PKS B1830−211 and MG J0414+0534. …”

Concentric Circles and Spiral Configurations for Large Correlator Arrays in Radio Astronomy by Kiehbadroudinezhad, Shahideh, Cada, Michael, Chen, Zhizhang (David), Shahabi, Adib, Short, C. Ian, Abidin, Zamri Zainal, Kiehbadroudinezhad, Samiramis

“…Aperture synthesis arrays are commonly used in radio astronomy to take images of radio point sources, with the planned Square Kilometre Array (SKA) being the most common example. …”