Relative ƒ-VALUES for Lines of fe i and TI I

King, Robert B.; King, Arthur S.

doi:10.1086/143898

Cited by 50 publications

(17 citation statements)

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“…The model presented in KA and KDA for the radio luminosity and linear size evolution of a given radio source depends on a variety of source and environment parameters. If the density distribution of the gaseous environment of the source, ρ x , is approximated by a King (1972) profile,…”

Section: Theoretical Source Distribution In the P−d Planementioning

confidence: 99%

On the cosmological evolution of the FR II radio source population

Kaiser

Alexander

1999

Monthly Notices of the Royal Astronomical Society

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We present an analytical model for the cosmological evolution of the FR II source population. Based on an earlier model for the intrinsic radio luminosity ‐‐ linear size evolution of these objects, we construct theoretical source samples. The source distributions in the radio power ‐‐ linear size plane of these samples are then compared with that of an observed flux‐limited sample. We find that the source parameters determining the radio luminosity of FR II objects cannot be independent of each other. The best‐fitting models predict the jet power to be correlated either with the lifetime of the source or with the shape of the density distribution of the source environment. The latter case is consistent with the observed tendency of the most luminous radio sources at high redshift to be located in richer and more extended environments than their low redshift counterparts. We also find evidence for a class of FR II sources distinctly different from the main population. These sources are extremely old and/or are located in very underdense environments. The luminosity function of FR II sources resulting from the model is in good agreement with previous results for high‐luminosity sources. The apparent luminosity evolution of the radio luminosity function is not reproduced because of the high flux limit of the comparison sample used. The cosmological evolution of the median linear size of FR II sources is found to be mild.

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Section: Theoretical Source Distribution In the P−d Planementioning

confidence: 99%

On the cosmological evolution of the FR II radio source population

Kaiser

Alexander

1999

Monthly Notices of the Royal Astronomical Society

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“…Ideally one would explore the connections between diskiness, cuspiness and anisotropy by experimenting with a series of semi‐analytic galaxy models that would be generalizations of popular spherical models (e.g. King 1966; Jaffe 1983; Hernquist 1990). Unfortunately, even now the repertoire of semi‐analytic flattened models is very sparse, and all of these models are unrealistic in one significant respect or another.…”

Section: Introductionmentioning

confidence: 99%

Rotation and anisotropy of galaxies revisited

Binney¹

2005

Monthly Notices of the Royal Astronomical Society

140

180

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The use of the tensor virial theorem (TVT) as a diagnostic of anisotropic velocity distributions in galaxies is revisited. The TVT provides a rigorous global link between velocity anisotropy, rotation and shape, but the quantities appearing in it are not easily estimated observationally. Traditionally use has been made of a centrally averaged velocity dispersion and the peak rotation velocity. Although this procedure cannot be rigorously justified, tests on model galaxies show that it works surprisingly well. With the advent of integral-field spectroscopy it is now possible to establish a rigorous connection between the TVT and observations. The TVT is reformulated in terms of sky-averages, and the new formulation is tested on model galaxies.Comment: 6 pages submitted to MNRA

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“…KDA is so‐called continuous injection model—the model assuming that the activity of the AGN is constant, the same as the rate at which relativistic particles in the jets are transported from this central engine to the lobes and hot spots. This model adopts also the power‐law radial density distribution (with the simplified profile proposed by King () of unperturbed gas surrounding the radio source. The expression for the total length of the jets at a given age is well defined by the energy conservation condition (cf.…”

Section: Brief Summary Of the Kda Model And The Dynage Algorithmmentioning

confidence: 99%

The use of the Monte Carlo methods in studying Fanaroff‐Riley II‐type radio sources

Kuligowska

2019

Astron Nachr

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General Monte Carlo methods are a broad class of algorithms relying on repeated random sampling to obtain numerical results in many physical problems. The underlying concept is to use randomness to solve problems that might be deterministic in principle. They are often used in problems with many coupled degrees of freedom. I present the possible use of these methods in the case of the analytical KDA (Kaiser, Dennett-Thorpe & Alexander, 1997) model of Fanaroff-Riley's II (FR II)-type radio sources assuming the continuum injection process in the jet-intergalactic medium interaction. Since this model is characterized by a large number of free parameters and originally requires knowing the large number of parameters unknown a priori, the use of the Monte Carlo methods is well justified. I discuss the application of these methods and its reliability in the case of the selected real radio sources.

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Relative ƒ-VALUES for Lines of fe i and TI I

Cited by 50 publications

References 0 publications

On the cosmological evolution of the FR II radio source population

On the cosmological evolution of the FR II radio source population

Rotation and anisotropy of galaxies revisited

The use of the Monte Carlo methods in studying Fanaroff‐Riley II‐type radio sources

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