FIRST-based survey of Compact Steep Spectrum sources

Kunert-Bajraszewska, M.; Marecki, A.; Thomasson, P.; Spencer, R. E.

doi:10.1051/0004-6361:20042496

Cited by 36 publications

(35 citation statements)

References 47 publications

(52 reference statements)

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“…If the supply of new relativistic particles turns off, the radio emission fades rapidly due to the severe energy losses and the radio spectrum steepens fast making these sources under-represented in flux-limited catalogues. Indeed, only a few objects have been suggested as faders so far, based on the absence of active regions (Kunert-Bajraszewska et al 2005, and the distribution of spectral index found steep across the whole source, like in the case of PKS 1518+047 (Orienti, Murgia, & Dallacasa 2010). A different situation is the recurrence of the radio emission in an AGN.…”

Section: The Life-cycle Of the Radio Emissionmentioning

confidence: 99%

Radio properties of Compact Steep Spectrum and GHz‐Peaked Spectrum radio sources

Orienti

2016

Astron Nachr

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Compact steep spectrum (CSS) and GHz-peaked spectrum (GPS) radio sources represent a large fraction of the extragalactic objects in flux density-limited samples. They are compact, powerful radio sources whose synchrotron peak frequency ranges between a few hundred MHz to several GHz. CSS and GPS radio sources are currently interpreted as objects in which the radio emission is in an early evolutionary stage. In this contribution I review the radio properties and the physical characteristics of this class of radio sources, and the interplay between their radio emission and the ambient medium of the host galaxy.

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Section: The Life-cycle Of the Radio Emissionmentioning

confidence: 99%

Radio properties of Compact Steep Spectrum and GHz‐Peaked Spectrum radio sources

Orienti

2016

Astron Nachr

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“…The sample has been studied in detail in a series of 5 papers, devoted to the study of the morphology of the objects on different angular scales, using MERLIN and VLA on large scale (Kunert et al 2002;Kunert-Bajraszewska et al 2005), MERLIN and EVN/VLBA for smaller sources (Marecki, Kunert-Bajrasze 2006), and the VLBA for the most compact objects (Kunert-Bajraszewska, Mare 2006;Kunert-Bajraszewska & Marecki 2007). In total, images have been presented for 46 sources, including 11 MSOs.…”

Section: First-based Survey(s) Of Css Sourcesmentioning

confidence: 99%

Samples and statistics of CSS and GPS sources

Giroletti

Polatidis

2009

Astron Nachr

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The dates of receipt and acceptance should be inserted later Several samples have been proposed in the last years in order to study the properties of intrinsically small sources. In this paper, we review the properties of the main samples that are currently available, both selected on the basis of spectral index and of morphology. As a result of the work in this area, large numbers of intrinsically small sources have been found. We summarize the present status of hot spot advance measurements, listing 18 sources with available VLBI data. The mean hot spot separation velocity is vsep = (0.19 ± 0.11)h −1 c and the kinematic ages span the range from 20 to 3000 years. Finally, we present a brief outlook on the use of future instrumentation in order to improve our understanding of radio source evolution. Prospects for VSOP2, e-VLA, e-MERLIN, LOFAR, ALMA, and Fermi are suggested.

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“…With one exception (1201+394) they have asymmetric structures. The remaining six objects are double or triple MSOs and were presented in Kunert-Bajraszewska et al (2005) -hereafter Paper II.…”

Section: The First-based Css Sources Samplementioning

confidence: 99%

FIRST-based survey of compact steep spectrum sources

Marecki¹,

Kunert-Bajraszewska²,

Spencer

2006

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Context. According to a generally accepted paradigm, small intrinsic sizes of Compact Steep Spectrum (CSS) radio sources are a direct consequence of their youth, but in later stages of their evolution they are believed to become large-scale sources. However, this notion was established mainly for strong CSS sources. Aims. In this series of papers we test this paradigm on 60 weaker objects selected from the VLA FIRST survey. They have 5-GHz flux densities in the range 150 < S 5 GHz < 550 mJy and steep spectra in the range 0.365 ≤ ν ≤ 5 GHz. The present paper is focused on sources that fulfill the above criteria and have angular sizes in the range ∼0. 2-1 . Methods. Observations of 19 such sources were obtained using MERLIN in "snapshot" mode at 5 GHz. They are presented along with 1.7-GHz VLBA and 5-GHz EVN follow-up snapshot observations made for the majority of them. For one of the sources in this subsample, 1123+340, a full-track 5-GHz EVN observation was also carried out. Results. This study provides an important element to the standard theory of CSS sources, namely that in a number of them the activity of their host galaxies probably switched off quite recently and their further growth has been stopped because of that. In the case of 1123+340, the relic of a compact "dead source" is particularly well preserved by the presence of intracluster medium of the putative cluster of galaxies surrounding it. Conclusions. The observed overabundance of compact sources can readily be explained in the framework of the scenario of "premature" cessation of the activity of the host galaxy nucleus. It could also explain the relatively low radio flux densities of many such sources and, in a few cases, their peculiar, asymmetric morphologies. We propose a new interpretation of such asymmetries based on the light-travel time argument.

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FIRST-based survey of Compact Steep Spectrum sources

Cited by 36 publications

References 47 publications

Radio properties of Compact Steep Spectrum and GHz‐Peaked Spectrum radio sources

Radio properties of Compact Steep Spectrum and GHz‐Peaked Spectrum radio sources

Samples and statistics of CSS and GPS sources

FIRST-based survey of compact steep spectrum sources

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