Optical identifications of flat-spectrum radio sources

1983 ◽  
Vol 88 ◽  
pp. 20 ◽  
Author(s):  
J. J. Condon ◽  
M. A. Condon ◽  
J. J. Broderick ◽  
M. M. Davis
Keyword(s):  
Radio Sources ◽  
Spectrum Radio ◽  
Optical Identifications

scholarly journals Radio positions and optical identifications for a sample of southern flat-spectrum radio sources - II

1991 ◽  
Vol 248 (3) ◽  
pp. 398-410 ◽  
Author(s):  
G. L. White ◽  
J. D. Bunton ◽  
M. W. B. Anderson ◽  
M. J. Batty ◽  
D. R. Brown ◽  
...  
Keyword(s):  
Radio Sources ◽  
Spectrum Radio ◽  
Optical Identifications

Optical identifications of a complete sample of flat-spectrum radio sources

1978 ◽  
Vol 83 ◽  
pp. 1036 ◽  
Author(s):  
J. J. Condon ◽  
D. L. Jauncey ◽  
A. E. Wright
Keyword(s):  
Radio Sources ◽  
Complete Sample ◽  
Spectrum Radio ◽  
Optical Identifications

The Fleurs Southern Benchmark Program

1989 ◽  
Vol 8 (2) ◽  
pp. 180-183 ◽  
Author(s):  
Michael J. Batty ◽  
Graeme L. White ◽  
John D. Bunton ◽  
David R. Brown ◽  
Julian B. Corben
Keyword(s):  
Flux Density ◽  
Reference Frame ◽  
Radio Sources ◽  
Position Errors ◽  
Significant Bias ◽  
Spectrum Radio ◽  
Sky Survey ◽  
Optical Identifications ◽  
Global Bias

AbstractA program to determine accurate radio positions and optical identifications of southern flat-spectrum radio sources has been undertaken with the six-dish array of the Fleurs synthesis telescope at 1.4 GHz and using the SERC J sky survey. This sample covers the declination range −80° to −50° and comprises all 198 sources from the Parkes catalogue with α of > −0.5 and flux density of 0.25 Jy.The radio astrometric phase of the program is complete. We conclude that by comparison with accurate VLBI positions the FST positions have r.m.s. uncertainties of ∼0″.9. There is no global bias in the FST positions at the 0″.2 to 0″.3 level relative to the JPL VLBI extragalactic reference frame. A comparison with positions from the Parkes catalogue shows that in the southern regions the Parkes catalogue has rms position errors of about 9″. There is no significant bias between the FST and Parkes positions.

CTD 93 and the Nature of Gigahertz Peaked Spectrum Radio Sources

1999 ◽  
Vol 515 (2) ◽  
pp. 558-566 ◽  
Author(s):  
David B. Shaffer ◽  
K. I. Kellermann ◽  
T. J. Cornwell
Keyword(s):  
Radio Sources ◽  
Spectrum Radio

scholarly journals Bulk Relativistic Motion in a Complete Sample of Radio Selected AGN

1987 ◽  
Vol 121 ◽  
pp. 287-293
Author(s):  
C.J. Schalinski ◽  
P. Biermann ◽  
A. Eckart ◽  
K.J. Johnston ◽  
T.Ph. Krichbaum ◽  
...  
Keyword(s):  
Dynamic Range ◽  
Radio Sources ◽  
Relativistic Motion ◽  
Complete Sample ◽  
Superluminal Motion ◽  
Spectrum Radio ◽  
Wide Range ◽  
Show Evidence

A complete sample of 13 flat spectrum radio sources is investigated over a wide range of frequencies and spatial resolutions. SSC-calculations lead to the prediction of bulk relativistic motion in all sources. So far 6 out of 7 sources observed with sufficient dynamic range by means of VLBI show evidence for apparent superluminal motion.

scholarly journals Optical and Near-Infrared Imaging of Ultra–Steep-Spectrum Radio Sources: The [ITAL]K[/ITAL]-[CLC][ITAL]z[/ITAL][/CLC] Diagram of Radio-selected and Optically Selected Galaxies

2002 ◽  
Vol 123 (2) ◽  
pp. 637-677 ◽  
Author(s):  
Carlos De Breuck ◽  
Wil van Breugel ◽  
S. A. Stanford ◽  
Huub Röttgering ◽  
George Miley ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Radio Sources ◽  
Near Infrared Imaging ◽  
Spectrum Radio

Spectra, optical identifications, and statistics of a complete sample of radio sources at declinations 10°–12°30′

2003 ◽  
Vol 47 (11) ◽  
pp. 903-915 ◽  
Author(s):  
A. G. Gorshkov ◽  
V. K. Konnikova ◽  
M. G. Mingaliev
Keyword(s):  
Radio Sources ◽  
Complete Sample ◽  
Optical Identifications

scholarly journals Spatially resolved studies of extragalactic jets in high redshift radio galaxies

2014 ◽  
Vol 10 (S313) ◽  
pp. 231-235
Author(s):  
Leah K. Morabito ◽  
Adam Deller ◽  
J. B. R. Oonk ◽  
Huub Röttgering ◽  
George Miley
Keyword(s):  
High Redshift ◽  
Low Frequency ◽  
Radio Galaxies ◽  
Radio Sources ◽  
Spatially Resolved ◽  
Long Baseline ◽  
Early Results ◽  
Spectrum Radio ◽  
Extragalactic Jets ◽  
Frequency Survey

AbstractThe correlation between radio spectral steepness and redshift has been successfully used to find high redshift (z ⩾ 2) radio galaxies, but the origin of this relation is unknown. The ultra-steep spectra of high-z radio sources make them ideally suited for studies with the Low Band Antenna of the new Low Frequency Array, which covers 10–80 MHz and has baselines up to about 1300 km. As part of an ongoing survey, we use the longest baselines to map the low-frequency (< 70 MHz) spatial distributions along the jets of 5 bright extended steep spectrum high-z radio sources. From this, we will determine whether the spectra change over these spatially resolved sources, thereby constraining particle acceleration processes. We present early results from our low-frequency survey of ultra-steep spectrum radio galaxies. The first low frequency long baseline images of these objects are presented.

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