EVN Observations of Compact Steep Spectrum Radio Sources at 18 CM

Fanti, C.; Fanti, R.; Parma, P.; Schilizzi, R. T.

doi:10.1007/978-94-010-9938-7_17

Cited by 110 publications

(170 citation statements)

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“…Early measurements of the angular sizes of GPS and CSS sources using VLBI strongly suggested that their spectral turnovers are caused by synchrotron self-absorption (SSA, Jones et al 1974;Hodges et al 1984;Mutel et al 1985). This was further advocated by Fanti et al (1990), who showed that the peak frequency and the largest angular size of CSS radio sources are strongly anticorrelated, as expected for SSA. For a homogeneous synchrotron self-absorbed radio source, the peak frequency, ν p , is given approximately by (Kellermann & Pauliny-Toth 1981):…”

Section: Spectral Turnover and Angular Sizementioning

confidence: 94%

“…We have collected angular sizes and peak frequencies of several flux density-selected samples from the literature for comparison. These included the Parkes halfJansky (PHJ) sample of GPS galaxies (Snellen et al 2002; with angular sizes from Liu et al 2007), the GPS galaxies from the Stanghellini (1998) sample, and the CSS galaxies from the Fanti (1990) sample. The angular sizes for the sources in the latter two samples come from O'Dea (1998).…”

Section: Spectral Turnover and Angular Sizementioning

confidence: 99%

“…Young radio sources can be recognised by their small angular (physical) sizes, their inverted spectra at low frequencies, and their often compact symmetric morphologies, with jet or lobe-like structures on either side of a central core. Depending on the observed characteristics, they are called compact steep spectrum (CSS) sources (Peacock & Wall 1982;Fanti et al 1990; O'Dea 1998), gigahertz peaked spectrum (GPS) sources (O'Dea 1998), and/or compact symmetric objects (CSO, Wilkinson et al 1994;Conway 2002).…”

Section: Introductionmentioning

confidence: 99%

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VLBI observations of the CORALZ sample: young radio sources at low redshift

Vries¹,

Snellen²,

Schilizzi

et al. 2009

A&A

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103

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Context. Young radio-loud active galactic nuclei form an important tool to investigate the evolution of extragalactic radio sources. To study the early phases of expanding radio sources, we have constructed CORALZ, a sample of 25 compact (θ < 2 ) radio sources associated with nearby (z < 0.16) galaxies. Aims. In this paper we determine the morphologies, linear sizes, and place first constraints on the lobe expansion speeds of the sources in the sample. Methods. We observed the radio sources from the CORALZ sample with MERLIN at 1.4 GHz or 1.6 GHz, the EVN at 1.6 GHz, and global VLBI at 1.6 GHz and/or 5.0 GHz. Results. Radio maps, morphological classifications, and linear sizes are presented for all sources in the CORALZ sample. We have determined a first upper limit to the expansion velocity of one of the sources, which is remarkably low compared to the brighter GPS sources at higher redshifts, indicating a relation between radio luminosity and expansion speed, in agreement with analytical models. In addition we present further strong evidence that the spectral turnovers in GPS and CSS sources are caused by synchrotron self-absorption (SSA): the CORALZ sources are significantly offset from the well-known correlation between spectral peak frequency and angular size, but this correlation is recovered after correcting for the flux-density dependence, as predicted by SSA theory.

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Section: Spectral Turnover and Angular Sizementioning

confidence: 94%

Section: Spectral Turnover and Angular Sizementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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VLBI observations of the CORALZ sample: young radio sources at low redshift

Vries¹,

Snellen²,

Schilizzi

et al. 2009

A&A

Self Cite

103

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“…3C 380, associated with the γ-ray source 3FGL J1829.6+4844, was part of the sample of powerful CSS objects selected by Fanti et al (1990). However, its complex radio structure extending on a total linear size of ∼ 70 kpc (largely exceeding the optical host galaxy) (Fig.…”

Section: Young Radio Sources In the Third Lat Agn Cataloguementioning

confidence: 99%

The Fermi ‐LAT view of young radio sources

2016

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Compact Symmetric Objects (CSO) are considered to be the young version of Fanaroff-Riley type I and type II radio galaxies, with typical sizes smaller than 1 kpc and ages of the order of a few thousand years. Before the launch of the Fermi satellite, young radio sources were predicted to emerge as a possible new γ-ray emitting population detectable by the Large Area Telescope (LAT). After more than 6 years of Fermi operation the question of young radio sources as γ-ray emitting objects still remains open. In this contribution we discuss candidate γ-ray emitting CSO and future perspective for detecting young radio sources with Fermi-LAT.

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“…As an example, data have been published for only 7 of the 24 objects in the list of CSSs from the 3C and PW catalogues (Fanti et al 1990). All of these show a core-jet structure.…”

Section: Comparison With Other Polarised Css Quasarsmentioning

confidence: 99%

VLBA polarimetric observations of the CSS quasar 3C 147

Rossetti

Mantovani

Dallacasa

et al. 2009

A&A

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Aims. We report new VLBA polarimetric observations of the compact steep-spectrum (CSS) quasar 3C 147 (B0538 + 498) at 5 and 8.4 GHz. Methods. By using multifrequency VLBA observations, we derived milliarcsecond-resolution images of the total intensity, polarisation, and rotation measure distributions, by combining our new observations with archival data. Results. The source shows a one-sided structure, with a compact region, and a component extending about 200 mas to the south-west. The compact region is resolved into two main components with polarised emission, a complex rotation measure distribution, and a magnetic field dominated by components perpendicular to the source axis. Conclusions. By considering all the available data, we examine the possible location of the core component, and discuss two possible interpretations of the observed structure of this source: core-jet and lobe-hot spot. Further observations to unambiguously determine the location of the core would help distinguish between the two possibilities discussed here.

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EVN Observations of Compact Steep Spectrum Radio Sources at 18 CM

Cited by 110 publications

References 0 publications

VLBI observations of the CORALZ sample: young radio sources at low redshift

VLBI observations of the CORALZ sample: young radio sources at low redshift

The Fermi ‐LAT view of young radio sources

VLBA polarimetric observations of the CSS quasar 3C 147

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