The determination of the spectral turnover in faint Compact 
 Steep-Spectrum radio sources using the VLA at 74 MHz

Tschager, W.; Schilizzi, R. T.; Röttgering, H. J. A.; Snellen, I. A. G.; Miley, G. K.; Perley, R. A.

doi:10.1051/0004-6361:20030232

Cited by 11 publications

(9 citation statements)

References 15 publications

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“…These imply dynamical ages of typically 10 2−3 yr. Similar studies with similar results have now also been conducted by Tschager et al (2000) and Taylor et al (2000). Additional proof for youth comes from an analysis of the overall radio spectra of the somewhat larger CSS sources.…”

Section: Young Radio‐loud Agn and The Selection Of The Samplesupporting

confidence: 75%

Fundamental galaxy parameters for radio-loud active galactic nuclei and the black hole-radio power connection

Snellen¹,

Lehnert

Bremer³

et al. 2003

Monthly Notices of the Royal Astronomical Society

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We have determined the central velocity dispersions and surface brightness profiles for a sample of powerful radio galaxies in the redshift range 0.06 < z < 0.31, which were selected on the basis of their young radio source. The optical hosts follow the fundamental plane of elliptical galaxies, showing that young radio sources reside in normal ellipticals, as do other types of radio galaxies into which these objects are believed to evolve. As young radio sources are relatively straightforward to select and the contributions of the active galactic nuclei (AGN) light to the optical spectra are minimal, these objects can readily be used to study the evolution of the fundamental plane of elliptical galaxies out to z= 1, independent of optical selection effects. The black hole masses, Mbh, of the objects in our sample have been determined using the tight empirical relation of Mbh with central velocity dispersion, σe, and for literature samples of classical radio galaxies and optically selected ellipticals. Only the optically selected inactive galaxies are found to exhibit a correlation between Mbh and radio luminosity. In contrast, the radio powers of the AGN in the samples do not correlate with Mbh at all, with objects at a given black hole mass ranging over seven orders of magnitude in radio power. It is unlikely that beaming of the radio emission is responsible for the range in radio powers. We have been able to tie in the local population of powerful radio sources with its parent population of inactive elliptical galaxies: the local black hole mass function has been determined using the elliptical galaxy luminosity function and the Faber–Jackson and Mbh–σ relations. This was combined with the fraction of radio‐loud black holes as a function of Mbh, as determined from the optically selected galaxy sample, to derive the local volume‐density of radio galaxies and the distribution of their black hole masses. These are shown to be consistent with the local radio luminosity function and the distribution of black hole masses as found in the radio‐selected samples, and confirms that elliptical galaxies comprise the large majority of the radio‐loud population of active galaxies.

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Section: Young Radio‐loud Agn and The Selection Of The Samplesupporting

confidence: 75%

Fundamental galaxy parameters for radio-loud active galactic nuclei and the black hole-radio power connection

Snellen¹,

Lehnert

Bremer³

et al. 2003

Monthly Notices of the Royal Astronomical Society

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“…Bright CSS and GPS sources are common (≈30 and 10 per cent, respectively) in radio surveys, but few faint samples exist. Previous surveys include (Snellen, Schilizzi & van Langevelde 2000; Tschager et al 2003b; Kunert‐Bajraszewska & Marecki 2007; Fanti et al 2011, and references therein), which catalogue CSS and GPS sources down to ∼20 mJy. If these objects are as prevalent at faint flux densities, a whole population of these objects remains mostly unknown (Snellen et al 1998; Tschager et al 2003a).…”

Section: Faint Css and Gps Candidate Sources In Atlasmentioning

confidence: 99%

Spectral index properties of milliJansky radio sources

Randall

Hopkins

Norris

et al. 2012

Monthly Notices of the Royal Astronomical Society

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At the faintest radio flux densities (S_1.4 < 10 mJy), conflicting results have arisen regarding whether there is a flattening of the average spectral index between a low radio frequency (325 or 610 MHz), and e.g. 1.4 GHz. We present a new catalogue of 843 MHz radio sources in the ELAIS-S1 field that contains the sources, their ATLAS counterparts, and the spectral index distributions of the sources as a function of flux density. We do not find any statistically significant evidence for a trend towards flatter spectral indices with decreasing flux density. We then investigate the spectral index distribution with redshift for those sources with reliable redshifts and explore the infrared properties. An initial sample of faint Compact Steep Spectrum sources in ATLAS is also presented, with a brief overview of their properties.Comment: Accepted for publication in MNRAS. 18 pages, 19 figures, 6 tables. The full version of Table 1 will be available in the online version of the articl

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“…More recently a major step towards weaker sources has been made by Tschager et al (2003) and earlier by Fanti et al (2001) who carried out VLA observations of 2 Official website: http://sundog.stsci.edu candidate sources selected from the B3-VLA (Vigotti et al 1989) survey. It became clear to us that the FIRST survey, because of its resolution (5.…”

Section: The Parent Sample and Its Previous Observationsmentioning

confidence: 99%

FIRST-based survey of Compact Steep Spectrum sources

Kunert-Bajraszewska¹,

Marecki²,

Thomasson

et al. 2005

A&A

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Abstract.A new sample of candidate Compact Steep Spectrum (CSS) sources that are much weaker than the CSS source prototypes has been selected from the VLA FIRST catalogue. MERLIN "snapshot" observations of the sources at 5 GHz indicate that six of them have an FR II-like morphology, but are not edge-brightened as is normal for Medium-sized Symmetric Objects (MSOs) and FR IIs. Further observations of these six sources with the VLA at 4.9 GHz and MERLIN at 1.7 GHz, as well as subsequent full-track observations with MERLIN at 5 GHz of what appeared to be the two sources of greatest interest are presented. The results are discussed with reference to the established evolutionary model of CSS sources being young but in which not all of them evolve to become old objects with extended radio structures. A lack of stable fuelling in some of them may result in an early transition to a so-called coasting phase so that they fade away instead of growing to become large-scale objects. It is possible that one of the six sources (1542+323) could be labelled as a prematurely "dying" MSO or a "fader".

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The determination of the spectral turnover in faint Compact Steep-Spectrum radio sources using the VLA at 74 MHz

Cited by 11 publications

References 15 publications

Fundamental galaxy parameters for radio-loud active galactic nuclei and the black hole-radio power connection

Fundamental galaxy parameters for radio-loud active galactic nuclei and the black hole-radio power connection

Spectral index properties of milliJansky radio sources

FIRST-based survey of Compact Steep Spectrum sources

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