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The low-frequency polarisation properties of radio sources are poorly studied, particularly in statistical samples. However, the new generation of low-frequency telescopes, such as the Murchison Widefield Array (MWA; the precursor for the…

We present a summary of an identification program of the more than 2000 X-ray sources detected during the ROSAT All-Sky Survey (Voges et al. 1999) at high galactic latitude, |b| > 30 degr, with countrate above 0.2 s-1. This program, termed…

This is the second of two papers describing the second data release (DR2) of the Australia Telescope Large Area Survey (ATLAS) at 1.4 GHz. In Paper I we detailed our data reduction and analysis procedures, and presented catalogues of…

Astrophysics of Galaxies · Physics 2015-06-19 C. A. Hales , R. P. Norris , B. M. Gaensler , E. Middelberg

The Very Large Array (VLA) has been used in C-configuration to map an area \~0.3 square degrees at 1.4 GHz with 5sigma sensitivities of 0.305, 0.325, 0.380 and 0.450 mJy/beam over four equal subareas. Radio properties are presented for 62…

Applying basic physical principles to recent observational results, we derive upper and lower limits on microwave anisotropy from point sources over the range of frequencies 10-1000 GHz. We examine the level of noise in the observations as…

Astrophysics · Physics 2007-05-23 Eric Gawiser , Andrew Jaffe , Joseph Silk

We made two new sensitive (rms noise sigma_n ~ 1 microJy/beam) high resolution (theta = 3.0" and theta = 0.66" FWHM) S--band (2 < nu < 4 GHz) images covering a single JVLA primary beam (FWHM ~ 14') centered on J2000 RA = 10 46, Dec = 59 01…

Astrophysics of Galaxies · Physics 2021-08-13 W. D. Cotton , J. J. Condon , K. I. Kellermann , M. Lacy , R. A. Perley , A. M. Matthews , T. Vernstrom , Douglas Scott , J. V. Wall

We present some first results on the variability, polarization and general properties of radio sources selected in a blind survey at 20 GHz, the highest frequency at which a sensitive radio survey has been carried out over a large area of…

Cross-identifying complex radio sources with optical or infra red (IR) counterparts in surveys such as the Australia Telescope Large Area Survey (ATLAS) has traditionally been performed manually. However, with new surveys from the…

Astrophysics of Galaxies · Physics 2017-10-09 S. D. Weston , N. Seymour , S. Gulyaev , R. P. Norris , J. Banfield , M. Vaccari , A. M. Hopkins , T. M. O. Franzen

A survey of the North Celestial Pole region using the RATAN-600 radio telescope at five frequencies in the range 2.3 to 21.7 GHz is described. Sources were chosen from the NVSS catalogue. The flux densities of 171 sources in the Declination…

In this paper I outline a new strategy for the routine detection and imaging of faint (sub-mJy and microJy) radio sources with VLBI and SVLBI. The strategy relies on a combination of in-beam phase-referencing, wide-field VLBI imaging and…

Astrophysics · Physics 2007-05-23 M. A. Garrett

Published data from long-term observations of a strip of sky at declination +5 degrees carried out at 7.6 cm on the RATAN-600 radio telescope are used to estimate some statistical properties of radio sources. Limits on the sensitivity of…

Cosmology and Nongalactic Astrophysics · Physics 2012-05-24 Yu. N. Parijskij , N. S. Soboleva , A. V. Temirova , N. N. Bursov , O. P. Zhelenkova

We present the results of an ultra-deep radio continuum survey, containing $\sim480$ hours of observations, of the Galactic globular cluster 47 Tucanae with the Australia Telescope Compact Array. This comprehensive coverage of the cluster…

Context: To investigate the joint evolution of active galactic nuclei and star formation in the Universe. Aims: In the 1.4 GHz survey with the Australia Telescope Compact Array of the Chandra Deep Field South and the European Large Area ISO…

Astrophysics · Physics 2009-11-13 E. Middelberg , R. P. Norris , S. Tingay , M. Y. Mao , C. J. Phillips , A. W. Hotan

An international project is underway to design and build a radio telescope with an effective collecting area two orders of magnitude greater than the largest existing instruments. One of the many scientific goals of this instrument will be…

Astrophysics · Physics 2009-09-25 A. Hopkins , R. Windhorst , L. Cram , R. Ekers

We present the results of the flux density measurements at 4.85 GHz and 10.45 GHz of a sample of 5998 NVSS radio sources with the Effelsberg 100 m telescope. The initial motivation was the need to identify the NVSS radio sources that could…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 E. Angelakis , A. Kraus , A. C. S. Readhead , J. A. Zensus , R. Bustos , T. P. Krichbaum , A. Witzel , T. J. Pearson

We present a point source catalogue of the Large Magellanic Cloud (LMC) using observations from the MeerKAT radio telescope across a broad frequency band centred at 1295 MHz (L-band) with 12 sub-bands and an angular resolution of 8 arcsec x…

We describe a 325-MHz survey, undertaken with the Giant Metrewave Radio Telescope (GMRT), which covers a large part of the three equatorial fields at 9, 12 and 14.5 h of right ascension from the Herschel-Astrophysical Terahertz Large Area…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-16 T. Mauch , H. -R. Klöckner , S. Rawlings , M. J. Jarvis , M. J. Hardcastle , D. Obreschkow , D. J. Saikia , M. A. Thompson

We present the results from the 1.2 mm continuum image obtained as part of the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS). The 1.2 mm continuum image has a size of 2.9 (4.2) arcmin$^2$ within a primary beam response…

We measure the angular clustering of ~2000 radio sources in The Bootes Deep Field, covering 5.3 deg^2 down to S(1.4 GHz)=0.2 mJy. With reference to work by Blake & Wall, we show that the size distribution of multi-component radio galaxies…

Astrophysics · Physics 2009-11-07 R. J. Wilman , H. J. A. Rottgering , R. A. Overzier , M. J. Jarvis

We describe a 22-year survey for variable and transient radio sources, performed with archival images taken with the Molonglo Observatory Synthesis Telescope (MOST). This survey covers $2775 \unit{deg^2}$ of the sky south of $\delta <…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 Keith Bannister , Tara Murphy , Bryan M. Gaensler , Richard Hunstead , Shami Chatterjee