中文
相关论文

相关论文: The LBA Calibrator Survey of southern compact extr…

200 篇论文

Compact Steep Spectrum (CSS) and Gigahertz Peaked Spectrum (GPS) sources are classes of compact, powerful, extragalactic objects. These sources are thought to be the earliest stages in the evolution of radio galaxies, capturing the ignition…

宇宙学与河外天体物理 · 物理学 2015-05-28 Kate E. Randall , Andrew M. Hopkins , Ray P. Norris , Philip G. Edwards

Based on the ATLBS survey we present a sample of extended radio sources and derive morphological properties of faint radio sources. 119 radio galaxies form the ATLBS-Extended Source Sample (ATLBS-ESS) consisting of all sources exceeding 30"…

宇宙学与河外天体物理 · 物理学 2015-06-04 L. Saripalli , R. Subrahmanyan , K. Thorat , R. D. Ekers , R. W. Hunstead , H. M. Johnston , E. M. Sadler

In this paper, progress in improving the coordinates uncertainty of extragalactic radio sources derived from astrometric and geodetic VLBI observations is investigated. For this purpose, 30 catalogs of radio source positions computed in…

天体物理仪器与方法 · 物理学 2025-12-05 Zinovy Malkin

We report the results of a 5-GHz southern-hemisphere snapshot VLBI observation of a sample of blazars. The observations were performed with the Southern Hemisphere VLBI Network plus the Shanghai station in 1993 May. Twenty-three…

The Australia Telescope Compact Array (ATCA) has been used at 1.38 and 2.38 GHz to survey seven southern Abell clusters of galaxies with high X-ray luminosities: A2746, A2837, A3126, A3216, A3230, A3827 and A3836. The clusters have also…

天体物理学 · 物理学 2009-11-13 O. B. Slee , H. Andernach , V. J. McIntyre , G. S. Tsarevsky

We present a catalog of 321 compact radio sources in the declination range 0deg > delta > -30deg. The positions of these sources have been measured with a two-dimensional rms accuracy of 35 milliarcseconds using the NRAO Very Large Array.…

天体物理学 · 物理学 2009-11-07 Joshua N. Winn , Alok R. Patnaik , J. M. Wrobel

We report here on multi-frequency VLBA observations of three extragalactic sources within 1 degree of the Galactic Center. These sources have been used as astrometric reference sources for VLA and VLBA determinations of the proper motion of…

天体物理学 · 物理学 2016-08-30 Geoffrey C. Bower , Donald C. Backer , Richard A. Sramek

We present an all-sky catalog of absolute positions and estimates of correlated flux density of 21,942 compact radio sources determined from processing interferometric visibility data of virtually all very long baseline interferometry…

天体物理仪器与方法 · 物理学 2025-01-20 Leonid Petrov , Yuri Y. Kovalev

We present polarization measurements of extragalactic radio sources observed during the Cosmic Microwave Background polarization survey of the Q/U Imaging Experiment (QUIET), operating at 43 GHz (Q-band) and 95 GHz (W-band). We examine…

We present here the results of a 325 MHz radio survey of M31, conducted with the A-configuration of the Very Large Array. The survey covered an area of 7.6 deg$^2$, and a total of 405 radio sources between $\la$6\arcsec and 170\arcsec in…

天体物理学 · 物理学 2009-11-10 Joseph D. Gelfand , T. Joseph W. Lazio , B. M. Gaensler

We introduce the Serendipitous H-ATLAS-fields Observations of Radio Extragalactic Sources (SHORES) multiple pencil beam survey that observed at 2.1 GHz with the Australia Telescope Compact Array (ATCA) 29 fields in total intensity and…

We present a new broadband radio frequency catalogue across 0.12 GHz $\le \nu \le$ 20 GHz created by combining data from the Murchison Widefield Array Commissioning Survey, the Australia Telescope 20 Gigahertz survey, and the literature.…

星系天体物理 · 物理学 2018-02-27 V. M. Harvey , T. Franzen , J. Morgan , N. Seymour

As a step toward investigating the parsec-scale properties of faint extragalactic radio sources, the Very Long Baseline Array (VLBA) was used at 5.0 GHz to obtain phase-referenced images of 76 sources in the NOAO Bootes field. These 76…

天体物理学 · 物理学 2008-11-26 J. M. Wrobel , G. B. Taylor , T. A. Rector , S. T. Myers , C. D. Fassnacht

Data from a recent Australia Telescope Compact Array (ATCA) program of multi-frequency, multi-epoch monitoring of 202 active galactic nuclei with declinations < +10 degrees have been searched for GHz Peaked Spectrum (GPS) and Compact Steep…

天体物理学 · 物理学 2009-11-10 P. G. Edwards , S. J. Tingay

We have observed a sample of 64 small diameter sources towards the central -6 degree < l< 6 degree, -2 degree < b < 2 degree of the Galaxy with the aim of studying the Faraday rotation measure near the Galactic Centre (GC) region. All the…

天体物理学 · 物理学 2008-11-26 Subhashis Roy , A. Pramesh Rao , Ravi Subrahmanyan

From an on-going survey of the Galactic bulge, we have discovered a number of compact, steep spectrum radio sources. In this present study we have carried out more detailed observations for two of these sources, located 43 arcmin and 12.7…

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…

天体物理学 · 物理学 2009-11-06 M. G. Mingaliev , V. A. Stolyarov , R. D. Davies , S. J. Melhuish , N. A. Bursov , G. V. Zhekanis

The high-frequency radio sky, like the gamma-ray sky surveyed by the Fermi satellite, is dominated by flat spectrum radio quasars and BL Lac objects at bright flux levels. To investigate the relationship between radio and gamma-ray emission…

高能天体物理现象 · 物理学 2015-05-18 Elizabeth K. Mahony , Elaine M. Sadler , Tara Murphy , Ronald D. Ekers , Philip G. Edwards , Marcella Massardi

We present the first sub-mJy ($\approx0.7$ mJy beam$^{-1}$) survey to be completed below 100 MHz, which is over an order of magnitude deeper than previously achieved for widefield imaging of any field at these low frequencies. The high…

Radio emission has been detected in a broad variety of stellar objects from all stages of stellar evolution. However, most of our knowledge originates from targeted observations of small samples, which are strongly biased to sources which…

太阳与恒星天体物理 · 物理学 2015-10-07 G. Umana , C. Trigilio , T. M. O. Franzen , R. P. Norris , P. Leto , A. Ingallinera , C. S. Buemi , C. Agliozzo , F. Cavallaro , L. Cerrigone