Cross-correlating radio continuum surveys and CMB lensing: constraining redshift distributions, galaxy bias and cosmology by Alonso, D, Jarvis, M, Bellini, E, Schwarz, DJ, Hale, C

“…Assuming the redshift distribution predicted by the Square Kilometre Array Design simulations, we use our measurements to place constraints on the linear bias of radio galaxies and the amplitude of matter inhomogeneities σ8, finding σ8=0.69+0.14−0.21 assuming the galaxy bias scales with the inverse of the linear growth factor, and σ8=0.79+0.17−0.32 assuming a constant bias.…”

A GPU implementation of the correlation technique for real-time Fourier domain pulsar acceleration searches by Dimoudi, S, Adamek, K, Thiagaraj, P, Ransom, S, Karastergiou, A, Armour, W

“…Existing methods are currently computationally expensive, and the vast amount of data that will be produced by next-generation instruments such as the Square Kilometre Array necessitates real-time acceleration searches, which in turn requires the use of high-performance computing (HPC) platforms. …”

Measuring the distance to the black hole candidate X-ray binary MAXI J1348–630 using H I absorption by Chauhan, J, Miller-Jones, JCA, Raja, W, Allison, JR, Jacob, PFL, Anderson, GE, Carotenuto, F, Corbel, S, Fender, R, Hotan, A, Whiting, M, Woudt, PA, Koribalski, B, Mahony, E

“…We present neutral hydrogen (H I) absorption spectra of the black hole candidate X-ray binary (XRB) MAXI J1348–630 using the Australian Square Kilometre Array Pathfinder (ASKAP) and MeerKAT. The ASKAP H I spectrum shows a maximum negative radial velocity (with respect to the local standard of rest) of −31 ± 4 km s−1 for MAXI J1348–630, as compared to −50 ± 4 km s−1 for a stacked spectrum of several nearby extragalactic sources. …”

GPz: Non-stationary sparse Gaussian processes for heteroscedastic uncertainty estimation in photometric redshifts by Almosallam, I, Jarvis, M, Roberts, S

“…Obtaining accurate and well-characterized photometric redshift distributions is therefore critical for Euclid, the Large Synoptic Survey Telescope and the Square Kilometre Array. However, determining accurate variance predictions alongside single point estimates is crucial, as they can be used to optimize the sample of galaxies for the specific experiment (e.g. weak lensing, baryon acoustic oscillations, supernovae), trading off between completeness and reliability in the galaxy sample. …”

The performance and calibration of the CRAFT fly’s eye fast radio burst survey by James, C, Bannister, K, Macquart, J, Ekers, R, Oslowski, S, Shannon, R, Allison, J, Chippendale, A, Collier, J, Franzen, T, Hotan, A, Leach, M, McConnell, D, Pilawa, M, Voronkov, M, Whiting, M

“…The Commensal Real-time Australian Square Kilometre Array Pathfinder Fast Transients survey is the first extensive astronomical survey using phased array feeds. …”

Analysing the impact of far-out sidelobes on the imaging performance of the SKA-LOW telescope by Mort, B, Dulwich, F, Razavi-Ghods, N, de Lera Acedo, E, Grainge, K

“…The Square Kilometre Array's Low Frequency instrument (SKA-LOW) will be the most sensitive aperture array ever used for radio astronomy, and will operate in the under-sampled regime for most of the frequency band where grating-lobes pose particular challenges. …”

Determining neutrino properties using future galaxy redshift surveys by Abdalla, F, Rawlings, S

“…We consider the prospects of determining both the neutrino mass scale and the number of of massive neutrinos using future redshift surveys, specifically those undertaken with the Square Kilometre Array (SKA), with and without additional constraints from the upcoming Planck CMB experiment. …”

The Rapid ASKAP Continuum Survey I: Design and first results by McConnell, D, Hale, CL, Lenc, E, Banfield, JK, Heald, G, Hotan, AW, Leung, JK, Moss, VA, Murphy, T, O'Brien, A, Pritchard, J, Raja, W, Sadler, EM, Stewart, A, Thomson, AJM, Whiting, M, Allison, JR, Amy, SW, Anderson, C, Ball, L, Bannister, KW, Bell, M, Bock, DC-J, Bolton, R, Bunton, JD, Chippendale, AP, Collier, JD, Cooray, FR, Cornwell, TJ, Diamond, PJ, Edwards, PG, Gupta, N, Hayman, DB, Heywood, I, Jackson, CA, Koribalski, BS, Lee-Waddell, K, McClure-Griffiths, NM, Ng, A, Norris, RP, Phillips, C, Reynolds, JE, Roxby, DN, Schinckel, AET, Shields, M, Tremblay, C, Tzioumis, A, Voronkov, MA, Westmeier, T

“…The Rapid ASKAP Continuum Survey (RACS) is the first large-area survey to be conducted with the full 36-antenna Australian Square Kilometre Array Pathfinder (ASKAP) telescope. RACS will provide a shallow model of the ASKAP sky that will aid the calibration of future deep ASKAP surveys. …”

Radio galaxy populations and the multitracer technique: pushing the limits on primordial non-Gaussianity by Ferramacho, L, Santos, MG, Jarvis, M, Camera, S

“…We conclude that continuum radio surveys alone have the potential to constrain primordial non-Gaussianity to an accuracy at least a factor of 2 better than the present constraints obtained with Planck data on the cosmic microwave background bispectrum, opening a window to obtain σfnl ~ 1 with the Square Kilometre Array. © 2014 The Authors.…”

The detection of an extremely bright fast radio burst in a phased array feed survey by Bannister, KW, Shannon, RM, Macquart, J-P, Flynn, C, Edwards, PG, O’Neill, M, Osłowski, S, Bailes, M, Zackay, B, Clarke, N, D’Addario, LR, Dodson, R, Hall, PJ, Jameson, A, Jones, D, Navarro, R, Trinh, JT, Allison, J, Anderson, CS, Bell, M, Chippendale, AP, Collier, JD, Heald, G, Heywood, I, Hotan, AW, Lee-Waddell, K, Madrid, JP, Marvil, J, McConnell, D, Popping, A, Voronkov, MA, Whiting, MT, Allen, GR, Bock, DC-J, Brodrick, DP, Cooray, F, DeBoer, DR, Diamond, PJ, Ekers, R, Gough, RG, Hampson, GA, Harvey-Smith, L, Hay, SG, Hayman, DB, Jackson, CA, Johnston, S, Koribalski, BS, McClure-Griffiths, NM, Mirtschin, P, Ng, A, Norris, RP, Pearce, SE, Phillips, CJ, Roxby, DN, Troup, ER, Westmeier, T

“…We report the detection of an ultra-bright fast radio burst (FRB) from a modest, 3.4-day pilot survey with the Australian Square Kilometre Array Pathfinder. The survey was conducted in a wide-field fly's-eye configuration using the phased-array-feed technology deployed on the array to instantaneously observe an effective area of 160 deg$^2$, and achieve an exposure totaling 13200 deg$^2$ hr. …”

Connecting X-ray absorption and 21 cm neutral hydrogen absorption in obscured radio AGN by Moss, VA, Allison, JR, Sadler, EM, Urquhart, R, Soria, R, Callingham, JR, Curran, SJ, Musaeva, A, Mahony, EK, Glowacki, M, Farrell, SA, Bannister, KW, Chippendale, AP, Edwards, PG, Harvey-Smith, L, Heywood, I, Hotan, AW, Indermuehle, BT, Lenc, E, Marvil, J, McConnell, D, Reynolds, JE, Voronkov, MA, Wark, RM, Whiting, MT

“…To better understand this relationship, we investigate soft X-ray absorption as an indicator for the detection of associated H I absorption, as part of preparation for the First Large Absorption Survey in H I to be undertaken with the Australian Square Kilometre Array Pathfinder (ASKAP). We present the results of our pilot study using the Boolardy Engineering Test Array, a precursor to ASKAP, to search for new absorption detections in radio sources brighter than 1 Jy that also feature soft X-ray absorption. …”

GPz: non-stationary sparse Gaussian processes for heteroscedastic uncertainty estimation in photometric redshifts by Almosallam, I, Jarvis, M, Roberts, S

“…Obtaining accurate and well-characterized photometric redshift distributions is therefore critical for Euclid, the Large Synoptic Survey Telescope and the Square Kilometre Array. However, determining accurate variance predictions alongside single point estimates is crucial, as they can be used to optimize the sample of galaxies for the specific experiment (e.g. weak lensing, baryon acoustic oscillations, supernovae), trading off between completeness and reliability in the galaxy sample. …”

Probing dark energy with baryonic oscillations and future radio surveys of neutral Hydrogen by Abdalla, F, Rawlings, S

“…Given the expected sensitivity of a future Square Kilometre Array (SKA), given that half of its collecting area will be concentrated in a core of diameter $\sim 5 ~ \rm km$, and given a reasonable survey duration ($T_0$ $\sim$ 1 yr), we show that there will be negligible shot noise on a power spectrum derived from HI galaxies out to redshift $z \simeq 1.5$. …”

LoTSS/HETDEX: Optical quasars: I. Low-frequency radio properties of optically selected quasars by Gurkan, G, Hardcastle, M, Best, P, Morabito, L, Prandoni, I, Jarvis, M, Duncan, K

“…All these crucial results highlight the impact of the deep and high-resolution low-frequency radio surveys that foreshadow the compelling science cases for the Square Kilometre Array (SKA).…”

LOFAR: The LOw-Frequency ARray by Haarlem, M, Wise, M, Gunst, A, Heald, G, McKean, J, Hessels, J, Bruyn, A, Nijboer, R, Swinbank, J, Fallows, R, Brentjens, M, Nelles, A, Beck, R, Falcke, H, Fender, R, Hörandel, J, Koopmans, L, Mann, G, Miley, G, Röttgering, H, Stappers, B, Wijers, R, Zaroubi, S, Akker, M, Alexov, A

“…LOFAR's new capabilities, techniques and modus operandi make it an important pathfinder for the Square Kilometre Array (SKA). We give an overview of the LOFAR instrument, its major hardware and software components, and the core science objectives that have driven its design. …”

Radio weak lensing shear measurement in the visibility domain – I. Methodology by Rivi, M, Miller, L, Makhathini, S, Abdalla, F

“…The high sensitivity of the new generation of radio telescopes such as the Square Kilometre Array (SKA) will allow cosmological weak lensing measurements at radio wavelengths that are competitive with optical surveys. …”

The closest black holes by Fender, R, Maccarone, T, Heywood, I

“…The predicted radio flux densities correspond to a population of objects which, while below current survey limits, should be detectable with the Square Kilometre Array (SKA). Converting the simulated space velocities into proper motions, we further demonstrate that such IBH could be identified as faint high proper motion radio sources in SKA surveys.…”

Multifrequency search & classification of the transient radio sky by Stewart, A

“…I also discuss how the radio and optical classification method can be advanced and incorporated into automatic transient pipelines, which may be a necessity in the future Square Kilometre Array era.</p>…”

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. …”