The Square Kilometre Array

Dewdney, P. E.; Hall, Peter; Schilizzi, R. T.; Lazio, T.J.L.W.

doi:10.1109/jproc.2009.2021005

Cited by 977 publications

(650 citation statements)

References 11 publications

Supporting

Mentioning

642

Contrasting

Unclassified

Order By: Relevance

“…It is also critical to further explore the question of spatial correlation between X-rays and radio emission near the core of radio galaxies, which will be made possible in the southern hemisphere with extension of VLBI capability to lower frequencies using baselines between ASKAP and the 0.7-4 GHz wide-band receiver of the Parkes telescope (Manchester 2015). In the more distant future, the powerful combination of the Square Kilometre Array (Dewdney et al 2009) with Athena (Barret et al 2013) will enable studies of these objects at sensitivities that are orders of magnitude beyond what we can currently achieve with existing telescopes, up to z = 3 and beyond across a much wider range of galaxy types, luminosities, and evolutionary states.…”

Section: Resultsmentioning

confidence: 99%

Connecting X-ray absorption and 21 cm neutral hydrogen absorption in obscured radio AGN

Moss

Allison

Sadler

et al. 2017

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

Many radio galaxies show the presence of dense and dusty gas near the active nucleus. This can be traced by both 21 cm Hi absorption and soft X-ray absorption, offering new insight into the physical nature of the circumnuclear medium of these distant galaxies. To better understand this relationship, we investigate soft X-ray absorption as an indicator for the detection of associated Hi absorption, as part of preparation for the First Large Absorption Survey in Hi (FLASH) 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. Based on this pilot survey, we detected Hi absorption towards the radio source PKS 1657−298 at a redshift of z = 0.42. This source also features the highest X-ray absorption ratio of our pilot sample by a factor of 3, which is consistent with our general findings that X-ray absorption predicates the presence of dense neutral gas. By comparing the X-ray properties of AGN with and without detection of Hi absorption at radio wavelengths, we find that X-ray hardness ratio and Hi absorption optical depth are correlated at a statistical significance of 4.71σ. We conclude by considering the impact of these findings on future radio and X-ray absorption studies.

show abstract

Section: Resultsmentioning

confidence: 99%

Connecting X-ray absorption and 21 cm neutral hydrogen absorption in obscured radio AGN

Moss

Allison

Sadler

et al. 2017

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

“…In the SKA configuration, 50% of the data are collected within the central area with radius of 2.5 km, another 25% are collected within 180 km off the center, and the other 25% are attributed to the other stations [19].…”

Section: Brief Review Of Other Next-generation Telescopesmentioning

confidence: 99%

“…Next-generation radio telescopes, such as Square Kilometre Array Pathfinder (ASKAP) [15], Murchinson Widefield Array (MWA) [16], Meerkat [17], Square kilometre Array (SKA) [18,19], and Low-Frequency Array (LOFAR) [20], are expected to achieve a wider dynamic range and higher angular resolution than current instruments.…”

Section: Introductionmentioning

confidence: 99%

A Multi-Feature Visibility Processing Algorithm for Radio Interferometric Imaging on Next-Generation Telescopes

Chiou¹,

Kiang²,

Mittra³

2014

PIER C

View full text Add to dashboard Cite

Abstract-The visibility distribution, which is related to the configuration of stations, can be categorized into different features, each having different levels of data number density. A computationally efficient multi-feature image reconstruction algorithm, well adapted for next-generation telescopes, is proposed based on this observation, which is more flexible to handle massive amount of visibility data expected in the future. In reconstructing the M87 image with the visibility data simulated on the Low-Frequency Array (LOFAR), this algorithm turns out to be a few hundreds to one thousand times faster and is more resilient to noises than the conventional algorithms.

show abstract

“…We need a commensurate theoretical effort to prepare for future surveys such as PFS [1], DESI [2], Euclid [3], WFIRST [4] and the SKA [5]. Future surveys will reach a high precision on scales that have not been probed so far -and we require accurate theoretical modeling of the quantities that we aim to measure and the probes that we want to construct.…”

Section: Introductionmentioning

confidence: 99%

Lensing and time-delay contributions to galaxy correlations

et al. 2016

View full text Add to dashboard Cite

Galaxy clustering on very large scales can be probed via the 2-point correlation function in the general case of wide and deep separations, including all the lightcone and relativistic effects. Using our recently developed formalism, we analyze the behavior of the local and integrated contributions and how these depend on redshift range, linear and angular separations and luminosity function. Relativistic corrections to the local part of the correlation can be non-negligible but they remain generally sub-dominant. On the other hand, the additional correlations arising from lensing convergence and time-delay effects can become very important and even dominate the observed total correlation function. We investigate different configurations formed by the observer and the pair of galaxies, and we find that the case of near-radial large-scale separations is where these effects will be the most important.

show abstract

The Square Kilometre Array

Cited by 977 publications

References 11 publications

Connecting X-ray absorption and 21 cm neutral hydrogen absorption in obscured radio AGN

Connecting X-ray absorption and 21 cm neutral hydrogen absorption in obscured radio AGN

A Multi-Feature Visibility Processing Algorithm for Radio Interferometric Imaging on Next-Generation Telescopes

Lensing and time-delay contributions to galaxy correlations

Contact Info

Product

Resources

About