On the Dependence of Spectral Turnover on Linear Size of Compact Steep Spectrum Radio Sources

AbstractWe consider evolution properties of galaxies and quasars with steep radio spectrum at the decametre band from the UTR-2 catalogue. The ratios of source's monochromatic luminosities at the decametre and high-frequency bands display the dependence on the redshift, linear size, characteristic age of examined objects. At that, the mean values of corresponding ratios for considered galaxies and quasars have enough close quantities,testifying on the unified model of sources. We analyse obtained relations for two types of steep-spectrum sources (with linear steep spectrum (S) and low-frequency steepness after a break (C+)) from the UTR-2 catalogue.

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CTD 93 and the Nature of Gigahertz Peaked Spectrum Radio Sources

The Astrophysical Journal ◽

10.1086/307061 ◽

1999 ◽

Vol 515 (2) ◽

pp. 558-566 ◽

Cited By ~ 12

Author(s):

David B. Shaffer ◽

K. I. Kellermann ◽

T. J. Cornwell

Keyword(s):

Radio Sources ◽

Spectrum Radio

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Bulk Relativistic Motion in a Complete Sample of Radio Selected AGN

Symposium - International Astronomical Union ◽

10.1017/s007418090015524x ◽

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.

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Erratum: Observations of flat-spectrum radio sources at 850 m from the James Clerk Maxwell Telescope - I. 1997 April to 2000 April

Monthly Notices of the Royal Astronomical Society ◽

10.1046/j.1365-8711.2003.06961.x ◽

2003 ◽

Vol 343 (4) ◽

pp. 1376-1376

Author(s):

E. I. Robson ◽

J. A. Stevens ◽

T. Jenness

Keyword(s):

Radio Sources ◽

James Clerk Maxwell ◽

Spectrum Radio

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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

The Astronomical Journal ◽

10.1086/324632 ◽

2002 ◽

Vol 123 (2) ◽

pp. 637-677 ◽

Cited By ~ 131

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

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Spatially resolved studies of extragalactic jets in high redshift radio galaxies

Proceedings of the International Astronomical Union ◽

10.1017/s1743921315002239 ◽

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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