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Alexander, Peter J.

doi:10.1023/a:1007806713840

Cited by 25 publications

(31 citation statements)

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“…Alexander (2000) presented an analytical model for the evolution of radio sources from small physical scales to classical doubles; they found that observational data can be reproduced assuming the presence of a population of sources that suffer disruption of their jets before escaping the host core radius. This scenario confirms earlier predictions that compact symmetric objects (CSOs), with typical sizes of ∼100, could switch off after a short period of time, ∼3000 years, possibly due to a lack of sufficient fueling (Readhead et al 1994;Kunert-Bajraszewska & Thomasson 2009).…”

Section: Discussionmentioning

confidence: 99%

Radio and spectroscopic properties of miniature radio galaxies: revealing the bulk of the radio-loud AGN population

Baldi¹,

Capetti²

2009

A&A

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We explore radio and spectroscopic properties of a sample of 14 miniature radio galaxies, i.e. early-type core galaxies hosting radioloud AGN of extremely low radio power, 10 27−29 erg s −1 Hz −1 at 1.4 GHz. Miniature radio galaxies smoothly extend the relationships found for the more powerful FR I radio galaxies between emission line, optical and radio nuclear luminosities to lower levels. However, they have a deficit of a factor of ∼100 in extended radio emission with respect to that of the classical example of 3CR/FR I. This is not due to their low luminosity, since we found radio galaxies of higher radio core power, similar to those of 3CR/FR I, showing the same behavior, i.e. lacking significant extended radio emission. Such sources form the bulk of the population of radio-loud AGN in the Sloan Digital Sky Survey. At a given level of nuclear emission, one can find radio sources with an extremely wide range, a factor of > ∼ 100, of radio power. We argue that the prevalence of sources with luminous extended radio structures in flux limited samples is due to a selection bias, since the inclusion of such objects is highly favored. The most studied catalogues of radio galaxies are thus composed by the minority of radio-loud AGN that meet the physical conditions required to form extended radio sources, while the bulk of the population is virtually unexplored.

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Section: Discussionmentioning

confidence: 99%

Radio and spectroscopic properties of miniature radio galaxies: revealing the bulk of the radio-loud AGN population

Baldi¹,

Capetti²

2009

A&A

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“…A simple prediction of the idea exposed here is that low-power jets are more common than high-power jets, which would directly explain the excess of compact sources in the number counts, as low-power jets would tend to be more compact under the explanation given here. Alexander (2000) gave the first hint in this direction, suggesting that frustrated, compact sources are short lived sources. It is possible, however, that some of those sources are not shortlived, but relatively old and propagating very slowly.…”

Section: Discussionmentioning

confidence: 99%

Radio source evolution

Perucho¹

2016

Astron Nachr

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Baldwin (1982) wrote that \emph{the distribution of sources in the radio luminosity, $P$, overall physical size, $D$, diagram} could be considered as \emph{the radio astronomer's $H-R$ diagram}. However, unlike the case of stars, not only the intrinsic properties of the jets, but also those of the host galaxy and the intergalactic medium are relevant to explain the evolutionary tracks of radio radio sources. In this contribution I review the current status of our understanding of the evolution of radio sources from a theoretical and numerical perspective, using the $P-D$ diagram as a framework. An excess of compact (linear size $\leq 10$~kpc) sources could be explained by low-power jets being decelerated within the host galaxy, as shown by recent numerical simulations. Finally, I discuss the possible tracks that radio sources may follow within this diagram, and the physical processes that can explain the different tracks.Comment: Submitted for publication in Astronomische Nachrichten. Review contribution to the proceedings of the 5th Workshop on CSS and GPS radio sources, held in Rimini (Italy) in May 2015. Applied some minor corrections as suggested by the referee and updated the bibliograph

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“…Another useful feature of the model for the largest objects is the possibility of combining the model solutions for different values of β and thereby the ability to mimic the effect of more realistic density distributions on the source dynamics (Alexander 2000).…”

Section: Large Sources L > Lmentioning

confidence: 99%

“…The source may either disappear altogether from the radio sky (Alexander 2000) or develop an FRI-type morphology (Kaiser & Best 2007). In any case, observational constraints require that its radio luminosity drops significantly.…”

Section: Size Evolution Across All Sizes?mentioning

confidence: 99%

Evolution of radio galaxies

Kaiser¹

2009

Astron Nachr

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The dynamical evolution of FRII-type radio galaxies can be successfully modelled employing purely analytical techniques. The solutions change depending on the lobe size relative to the characteristic length scale for individual objects, resulting in three distinct regimes. By far the best understood regime is that of large sources. For these we can also construct emission models predicting the evolution of the radio luminosity as a function of source size or age and a limited number of source parameters. We can use such models to constrain the evolution of the radio galaxy population as a whole. Building on these successes, we find some hints that radio galaxies can change their morphologies between the two FR classes. Better emission models for all length scales and models for FRI-type objects are now needed to progress our understanding of all evolutionary branches of radio galaxies.

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Cited by 25 publications

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Radio and spectroscopic properties of miniature radio galaxies: revealing the bulk of the radio-loud AGN population

Radio and spectroscopic properties of miniature radio galaxies: revealing the bulk of the radio-loud AGN population

Radio source evolution

Evolution of radio galaxies

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