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We present radio observations of 19 candidate compact steep-spectrum (CSS) objects selected from a well-defined, complete sample of 52 B2 radio sources of intermediate strength. These observations were made with the VLA A-array at 4.835…

Astrophysics · Physics 2009-11-07 D. J. Saikia , P. Thomasson , R. E. Spencer , F. Mantovani , C. J. Salter , S. Jeyakumar

The First Look Survey (FLS) is the first scientific product to emerge from the Spitzer Space Telescope. A small region of this field (the verification strip) has been imaged very deeply, permitting the detection of cosmologically distant…

Astrophysics · Physics 2009-11-10 R. Morganti , M. A. Garrett , S. Chapman , W. Baan , G. Helou , T. Soifer

We determine the small-scale structure for a large sample of Compact Steep Spectrum (CSS) and Gigahertz Peaked Spectrum (GPS) sources and a sample of larger radio sources at 327 MHz using the technique of Inter-Planetary Scintillation (IPS)…

Astrophysics · Physics 2007-05-23 S. Jeyakumar , D. J. Saikia , A. Pramesh Rao , V. Balasubramanian

We have studied a sample of 296 faint (> 0.5 mJy) radio sources selected from an area of the Tenth Cambridge (10C) survey at 15.7 GHz in the Lockman Hole. By matching this catalogue to several lower frequency surveys (e.g. including a deep…

Cosmology and Nongalactic Astrophysics · Physics 2013-02-06 I. H. Whittam , J. M. Riley , D. A. Green , M. J. Jarvis , I. Prandoni , G. Guglielmino , R. Morganti , H. J. A. Röttgering , M. A. Garrett

We report on the variability of 443 flat spectrum, compact radio sources monitored using the VLA for 3 days in 4 epochs at ~ 4 month intervals at 5 GHz as part of the Micro-Arcsecond Scintillation-Induced Variability (MASIV) survey. Over…

We study the faint radio population using wide-field very long baseline interferometry (VLBI) observations of 2865 known radio sources in the Cosmic Evolution Survey (COSMOS) field. The main objective of the project was to determine where…

We aim to confirm the compact nature and constrain the radio spectra of candidate persistent radio sources (PRSs) associated with repeating fast radio bursts (FRBs). We performed European VLBI Network (EVN) observations at 5 and 8 GHz…

High Energy Astrophysical Phenomena · Physics 2026-04-07 G. Bruni , L. Piro , Y. -P. Yang , L. Nicastro , A. Rossi , E. Palazzi , E. Maiorano , S. Savaglio , B. Zhang

The Very Large Array Sky Survey (VLASS) is observing the entire sky north of $-40^{\circ}$ in the S-band ($2<\nu<4\,$GHz), with the highest angular resolution ($2''.5$) of any all-sky radio continuum survey to date. VLASS will cover its…

Data from the Spitzer Space Telescope (the First Look Survey - FLS) have recently been made public. We have compared the 24 micron images with very deep WSRT 1.4 GHz observations (Morganti et al. 2004), centred on the FLS verification strip…

Astrophysics · Physics 2007-05-23 M. Orienti , M. A. Garrett , C. Reynolds , R. Morganti

We used the Karl G. Jansky Very Large Array (VLA) to image one primary beam area at 3 GHz with 8 arcsec FWHM resolution and 1.0 microJy/beam rms noise near the pointing center. The P(D) distribution from the central 10 arcmin of this…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-05 J. J. Condon , W. D. Cotton , E. B. Fomalont , K. I. Kellermann , N. Miller , R. A. Perley , D. Scott , T. Vernstrom , J. V. Wall

We present the analysis of four 3.6 cm radio continuum archival observations of Orion obtained using the Very Large Array in its A-configuration, with $0\rlap.{''}3$ angular resolution. The observations were made during the period…

Astrophysics · Physics 2009-11-10 Luis A. Zapata , Luis F. Rodriguez , Stanley E. Kurtz , C. R. O'Dell

This paper presents the catalog of correlated flux densities in three ranges of baseline projection lengths of 637 sources from a 43 GHz (Q-band) survey observed with the Korean VLBI Network. Of them, 623 sources have not been observed…

We describe a program to identify optical counterparts to radio sources from the VLA FIRST survey using the Cambridge APM scans of the POSS-I plates. We use radio observations covering 4150 square degrees of the north Galactic cap to a 20…

Astrophysics · Physics 2009-11-07 Richard G. McMahon , Richard L. White , David J. Helfand , Robert H. Becker

We have conducted a deep radio survey with the Very Large Array at 1.4 GHz of a region containing the Hubble Deep Field. This survey overlaps previous observations at 8.5 GHz allowing us to investigate the radio spectral properties of…

Astrophysics · Physics 2009-10-31 E. A. Richards

We present sub-arcsecond resolution multi-frequency (8 and 22 GHz) VLA images of five low power compact (LPC) radio sources, and phase referenced VLBA images at 1.6 GHz of their nuclear regions. At the VLA resolution we resolve the…

Astrophysics · Physics 2009-11-11 M. Giroletti , G. Giovannini , G. B. Taylor

This paper presents the Hubble diagram (K-z relation) for FIRST (Faint Images of the Radio Sky at 20 cm) radio sources identified in the Bootes and Cetus fields. The correlation between the K magnitude of the FIRST-NDWFS sample and the…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 Khadija EL Bouchefry

We identified 16 pulsars from the Faint Images of the Radio Sky at Twenty-cm (FIRST) at 1.4 GHz. Their positions and total flux densities are extracted from the FIRST catalog. Comparing the source positions with those in the PSRcatalog, we…

Astrophysics · Physics 2017-11-01 X. H. Li , J. L. Han

We performed observations with the Effelsberg 100-m radio telescope to measure flux densities and polarised emission of sources selected from the "Deep X-ray Radio Blazar Survey" (DXRBS) to better define their spectral index behaviour in…

Cosmology and Nongalactic Astrophysics · Physics 2011-07-28 Franco Mantovani , Marco Bondi , Karl-Heinz Mack

We present a series of new high-sensitivity and high-resolution radio-continuum images of M31 at \lambda=20 cm (\nu=1.4 GHz). These new images were produced by merging archived 20 cm radio-continuum observations from the Very Large Array…

Astrophysics of Galaxies · Physics 2015-06-04 T. J. Galvin , M. D. Filipović , E. J. Crawford , N. F. H. Tothill , G. F. Wong , A. Y. De Horta

VLBA observations at 18 cm are presented for 28 Compact Steep-spectrum radio Sources (CSSs) from the B3-VLA CSS sample. These sources were unresolved in previous VLA observations at high frequencies or their brightness distribution was…

Astrophysics · Physics 2009-11-07 D. Dallacasa , S. Tinti , C. Fanti , R. Fanti , L. Gregorini , C. Stanghellini , M. Vigotti
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