Search for microarcsecond structure in low-frequency variable radio sources

1977 ◽  
Vol 82 ◽  
pp. 785 ◽  
Author(s):  
J. W. Armstrong ◽  
S. R. Spangler ◽  
P. E. Hardee
Keyword(s):  
Low Frequency ◽  
Radio Sources ◽  
Variable Radio

The spectral evolution of low-frequency variable radio sources

1984 ◽  
Vol 281 ◽  
pp. L55 ◽  
Author(s):  
B. Dennison ◽  
J. J. Broderick ◽  
S. L. Odell ◽  
K. J. Mitchell ◽  
D. R. Altschuler ◽  
...  
Keyword(s):  
Low Frequency ◽  
Radio Sources ◽  
Spectral Evolution ◽  
Variable Radio

scholarly journals Correlated Flux Density Outbursts and Structural Variations in a Sample of Low Frequency Variable Radio Sources

1994 ◽  
Vol 159 ◽  
pp. 420-420
Author(s):  
M. Bondi ◽  
L. Padrielli ◽  
R. Fanti ◽  
L. Gregorini ◽  
F. Mantovani ◽  
...  
Keyword(s):  
Flux Density ◽  
Low Frequency ◽  
Radio Sources ◽  
Structural Variations ◽  
Vlbi Observations ◽  
Variable Radio

Snapshot VLBI observations at 18 cm have been obtained with a global array at three epochs (1980.1, 1981.8, 1987.9) in order to investigate flux density and/or structural variations for a sample of 21 low frequency variable sources (Padrielli et al. 1987 Astron Astrophys. Suppl. Ser., 67, 63; Bondi et al. 1993 in preparation).

Multifrequency light curves of low-frequency variable radio sources

1984 ◽  
Vol 89 ◽  
pp. 1784 ◽  
Author(s):  
D. R. Altschuler ◽  
J. J. Broderick ◽  
B. Dennison ◽  
K. J. Mitchell ◽  
S. L. Odell ◽  
...  
Keyword(s):  
Low Frequency ◽  
Light Curves ◽  
Radio Sources ◽  
Variable Radio

Results of a five-year program of multifrequency monitoring of low-frequency variable radio sources

1994 ◽  
Vol 93 ◽  
pp. 441 ◽  
Author(s):  
K. J. Mitchell ◽  
Brian Dennison ◽  
J. J. Condon ◽  
Daniel R. Altschuler ◽  
H. E. Payne ◽  
...  
Keyword(s):  
Low Frequency ◽  
Radio Sources ◽  
Variable Radio

The GLEAM 4-Jy Sample: The brightest radio-sources in the southern sky

2019 ◽  
Vol 15 (S356) ◽  
pp. 375-375
Author(s):  
Sarah White
Keyword(s):  
Radio Emission ◽  
Active Galactic Nuclei ◽  
Visual Inspection ◽  
Low Frequency ◽  
Galactic Nuclei ◽  
Radio Sources ◽  
Relativistic Jets ◽  
The Galaxy ◽  
Murchison Widefield Array ◽  
Past Activity

AbstractLow-frequency radio emission allows powerful active galactic nuclei (AGN) to be selected in a way that is unaffected by dust obscuration and orientation of the jet axis. It also reveals past activity (e.g. radio lobes) that may not be evident at higher frequencies. Currently, there are too few “radio-loud” galaxies for robust studies in terms of redshift-evolution and/or environment. Hence our use of new observations from the Murchison Widefield Array (the SKA-Low precursor), over the southern sky, to construct the GLEAM 4-Jy Sample (1,860 sources at S151MHz > 4 Jy). This sample is dominated by AGN and is 10 times larger than the heavily relied-upon 3CRR sample (173 sources at S178MHz > 10 Jy) of the northern hemisphere. In order to understand how AGN influence their surroundings and the way galaxies evolve, we first need to correctly identify the galaxy hosting the radio emission. This has now been completed for the GLEAM 4-Jy Sample – through repeated visual inspection and extensive checks against the literature – forming a valuable, legacy dataset for investigating relativistic jets and their interplay with the environment.

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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