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Related papers: Multi-Frequency Study of the B3--VLA Sample. I. 10…

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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 Westerbork Northern Sky Survey (WENSS) has been used to select a sample of Gigahertz Peaked Spectrum (GPS) radio sources at flux densities one to two orders of magnitude lower than bright GPS sources investigated in earlier studies.…

We defined a sub-sample of twelve GPS sources which have not been observed with the VLBI before, from the Parkes half-Jansky sample, and carried out VLBI observations at 1.6 GHz and 5 GHz with the European VLBI Network (EVN) in 2006 and…

Cosmology and Nongalactic Astrophysics · Physics 2011-01-25 L. Cui , X. Liu , J. Liu , H. -G. Song , Z. Ding

We apply the V/Vm test to a subsample of compact steep-spectrum sources from a complete sample of radio sources selected at 2.7 GHz. We find that the <V/Vm> has a value intermediate between those found for samples of extended steep-spectrum…

Astrophysics · Physics 2007-08-09 V. K. Kapahi , D. G. Banhatti

HR 8799 is an A5/F0 V star where exoplanets were first directly imaged. Four exoplanets were found within $\simeq 2\rlap.{''}0$ from the star. Here we report the VLA detection of a faint (19.1$\pm$2.7 $\mu$Jy) radio continuum (3.0 GHz)…

Solar and Stellar Astrophysics · Physics 2024-07-09 Luis F. Rodriguez , Luis A. Zapata

Extra-galactic radio sources are a significant contaminant in cosmic microwave background and Sunyaev-Zel'dovich effect experiments. Deep interferometric observations with the BIMA and OVRO arrays are used to characterize the spatial,…

The goal of the present study is to extend our current knowledge of the diffuse radio source (halo and relic) populations to $z$ $>$ 0.3. Here we report GMRT and EVLA radio observations of six galaxy clusters taken from the MAssive Cluster…

Astrophysics of Galaxies · Physics 2016-11-23 Viral Parekh , K. S. Dwarakanath , Ruta Kale , Huib Intema

Modern radio telescopes are routinely reaching depths where normal starforming galaxies are the dominant observed population. Realising the potential of radio as a tracer of star formation and black hole activity over cosmic time involves…

Astrophysics of Galaxies · Physics 2020-07-01 I. Heywood , C. L. Hale , M. J. Jarvis , S. Makhathini , J. A. Peters , M. L. L. Sebokolodi , O. M. Smirnov

We present the second catalogue of accurate positions and correlated flux densities for 1100 compact extragalactic radio sources that were not observed before 2008 at high angular resolution. The catalogue spans the declination range -90…

Instrumentation and Methods for Astrophysics · Physics 2019-04-15 Leonid Petrov , Alet de Witt , Elaine M. Sadler , Chris Phillips , Shinji Horiuchi

We present high angular resolution, high sensitivity 8.46 GHz (3.6 cm) radio continuum observations made toward the core of the HH~92 outflow with the Very Large Array in 2002-2003 and with the Expanded Very Large Array in 2011. We detect a…

Solar and Stellar Astrophysics · Physics 2014-05-27 L. F. Rodriguez , B. Reipurth , H. -F. Chiang

We present 1.4 GHz VLA observations of the variability of radio sources in the Lockman Hole region at the level of > 100 uJy on timescales of 17 months and 19 days. These data indicate that the areal density of highly variable sources at…

Astrophysics · Physics 2009-11-07 C. L. Carilli , R. Ivison , D. Frail

We present Giant Metrewave Radio Telescope (GMRT) 323 MHz radio continuum observations toward 13 radio-loud quasars at $z>5$, sampling the low-frequency synchrotron emission from these objects. Among the 12 targets successfully observed, we…

Astrophysics of Galaxies · Physics 2020-09-16 Yali Shao , Jeff Wagg , Ran Wang , Chris L. Carilli , Dominik A. Riechers , Huib T. Intema , Axel Weiss , Karl M. Menten

We present high-resolution observations made with the Very Large Array (VLA) in its A configuration at frequencies between 5 and 43 GHz of a sample of five massive young stellar objects (YSOs): LkHa101, NGC2024-IRS2, S106-IR, W75N and…

Astrophysics · Physics 2009-11-13 A. G. Gibb , M. G. Hoare

A complete sample of 27 radio galaxies was selected from the B2 and 3CR catalogs, in order to study their properties on the milliarcsecond scale. In the Appendix of this paper we present new radio images for 12 of them. Thanks to the…

Astrophysics · Physics 2009-11-06 G. Giovannini , W. D. Cotton , L. Feretti , L. Lara , T. Venturi

We present one of the deepest radio continuum surveys to date at a wavelength ~1 meter, at 324.5 MHz. The data reduction and analysis are described and an electronic catalog of the sources detected above 5 sigma is presented. We also…

Cosmology and Nongalactic Astrophysics · Physics 2009-11-13 Frazer N. Owen , G. E. Morrison , Matthew D. Klimek , Eric W. Greisen

We report on our Chandra Cycle 9 program to observe half of the 60 (unobserved by Chandra) 3C radio sources at z<0.3 for 8 ksec each. Here we give the basic data: the X-ray intensity of the nuclei and any features associated with radio…

High Energy Astrophysical Phenomena · Physics 2015-05-18 F. Massaro , D. E. Harris , G. Tremblay , D. Axon , S. Baum , A. Capetti , M. Chiaberge , R. Gilli , G. Giovannini , P. Grandi , F. D. Macchetto , C. O'Dea , G. Risaliti , W. Sparks

In this paper, we used the database of the university of Michigan Radio Astronomy Observatory (UMRAO) at three (4.8 GHz, 8.0 GHZ, and 14.5 GHz) radio frequency to analyze the radio light curves by the power spectral analysis method in…

Astrophysics · Physics 2009-11-13 J. H. Fan , Y. Liu , Y. H. Yuan

We present optical identifications and radio spectra for ten radio sources from two flux-density-complete samples. Radio variability characteristics are presented for four objects. The observations were obtained on the RATAN-600 radio…

Astrophysics · Physics 2009-11-07 V. Chavushyan , R. Mujica , A. G. Gorshkov , V. K. Konnikova , M. G. Mingaliev , J. R. Valdez

The FIRST survey, begun over twenty years ago, provides the definitive high-resolution map of the radio sky. This VLA survey reaches a 20cm detection sensitivity of 1 mJy over 10,575 deg**2 largely coincident with the SDSS area. Images and…

Astrophysics of Galaxies · Physics 2015-06-23 David J. Helfand , Richard L. White , Robert H. Becker

We have used the Australia Telescope Compact Array (ATCA) at 95GHz to carry out continuum observations of 130 extragalactic radio sources selected from the Australia Telescope 20GHz (AT20G) survey. Over 90% of these sources are detected at…

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