Evolutionary tracks of FRII sources through the P-D diagram

Kaiser, Christian; Dennett-Thorpe, J.; Alexander, Paul

doi:10.1093/mnras/292.3.723

Cited by 221 publications

(221 citation statements)

References 19 publications

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“…The clear deficiency of giants of high radio luminosity suggests that the luminosity of radio sources decreases as they evolve. The evolutionary tracks suggested by Kaiser et al (1997), which are shown in the figure, are roughly consistent with the data. However, in the models developed by Blundell, Rawlings & Willott (1999), the luminosity declines more rapidly than the Kaiser et al tracks, providing a somewhat better fit to the upper envelope for large linear sizes.…”

Section: Evolution Of Giant Radio Sourcessupporting

confidence: 83%

Giant Radio Sources: Evolution and GMRT Observations

Ishwara‐Chandra

Saikia

2002

Symp. - Int. Astron. Union

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Abstract. We study the evolution of giant radio sources and show that they are less luminous than the smaller-sized sources, and are roughly consistent with the evolutionary scenarios where the smaller-sized sources evolve to giants undergoing radiative and expansion losses. InverseCompton radiation losses due to the microwave background radiation dominates over the synchrotron losses for giant sources, while for the smaller sources, the latter dominates. We show that giant radio galaxies and quasars are consistent with the unified scheme, and their large sizes are not due to stronger cores. We also present preliminary GMRT images of three giant sources.

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Section: Evolution Of Giant Radio Sourcessupporting

confidence: 83%

Giant Radio Sources: Evolution and GMRT Observations

Ishwara‐Chandra

Saikia

2002

Symp. - Int. Astron. Union

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“…A negative radio power evolution is indeed expected for active radio radio sources (cf. Kaiser et al 1997;Blundell et al 1999). On the other hand, the observed effect can also be caused if a substantial fraction of the GRGs stop their radio activity (and "fade") before they reach a size of 3 Mpc.…”

Section: The 2-mpc Linear Size Cut-offmentioning

confidence: 99%

“…Kaiser et al 1997;Blundell et al 1999) predict the radio power and linear size evolution of powerful radio sources with time. According to these models, GRGs must be extremely old (i.e.…”

Section: Introductionmentioning

confidence: 99%

A new sample of giant radio galaxies from the WENSS survey

Schoenmakers

Bruyn

Röttgering

et al. 2001

A&A

116

141

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Abstract.We have used the Westerbork Northern Sky Survey (WENSS) to define a sample of 47 low redshift (z < ∼ 0.4) giant radio galaxies. This is the largest sample yet of such radio sources originating from a single survey. We present radio maps of the newly discovered giants and optical images and spectra of their host galaxies. We present some of their properties and discuss the selection effects. We investigate the distribution of the sources in the radio power -linear size P−D diagram, and how these parameters relate to the redshifts of the sources in our sample. We find a strong drop in the number of sources with a linear size above 2 Mpc. We argue that this is not a result of selection effects, but that it indicates either a strong luminosity evolution of radio sources of such a size, or that a large fraction of radio sources "switch off" before they are able to grow to a size of 2 Mpc.

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“…This appears large at first glance, but it becomes actually small with regard to the range of more than four decades of power. In view of the complexity of the objects, with a diversity of the strength of the thermal IR dust bump, evolving giant radio lobes (Kaiser et al 1997;Blundell & Rawlings 1999) and various circumgalactic environments (Barthel & Miley 1988), such a dispersion is certainly not surprising. Therefore, the striking similarity of the R dr distributions for quasars and galaxies provides strong evidence in favour of the basic role of the orientationdependent unification.…”

Section: Radio-infrared-comparisonmentioning

confidence: 99%

The ISOPHOT - MAMBO survey of 3CR radio sources: Further evidence for the unified schemes

Haas

Muller²,

Bertoldi

et al. 2004

A&A

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Abstract. We present the complete set of ISOPHOT observations of 3CR radio galaxies and quasars, which are contained in the ISO Data Archive, providing 75 mid-and far-infrared spectral energy distributions (SEDs) between 5 and 200 µm. For 28 sources they are supplemented with MAMBO 1.2 mm observations and for 15 sources with new submillimetre data from the SCUBA archive. The sample includes flat and steep spectrum quasars, broad and narrow line radio galaxies, as well as Fanaroff-Riley FR 1 and FR 2 types. The SED shapes exhibit a diversity in the infrared (IR), ranging from a smooth dominating synchrotron component in flat spectrum sources to a thermal dust bump around 60−100 µm in steep spectrum sources. The detection rate of a thermal bump in more than 50% of the cases suggests that dust emission may be a general phenomenon in these sources. We check the orientation-dependent unified scheme, in which the powerful FR 2 narrow line galaxies are quasars viewed at high inclination, so that their nuclei are hidden behind a dust torus intercepting the optical-ultraviolet AGN radiation and reemitting it in the infrared. We find that (1) both the quasars and the galaxies show a high mid-to far-infrared luminosity ratio typical for powerful AGNs and (2) -when matched in 178 MHz luminosity -both show the same ratio of isotropic farinfrared to isotropic 178 MHz lobe power. Therefore, from our large sample investigated here we find strong evidence for the orientation-dependent unification of the powerful FR 2 galaxies with the quasars. The distribution of the dust-to-lobe luminosity ratio shows a dispersion which we suggest to be most likely due to the additional influence of evolution and environment superposed on the orientation-dependent unification. We discuss our data also in the frame of the receding torus model. At the high 178 MHz luminosities of our sources above 10 26.5 W/Hz we do not find any support for this model in its original formulation and therefore we propose a refinement: The scale height of the torus might not be independent of luminosity, rather it may increase at high luminosities due to the impact of supernovae from starbursts accompanying the AGN phenomena.

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Evolutionary tracks of FRII sources through the P-D diagram

Cited by 221 publications

References 19 publications

Giant Radio Sources: Evolution and GMRT Observations

Giant Radio Sources: Evolution and GMRT Observations

A new sample of giant radio galaxies from the WENSS survey

The ISOPHOT - MAMBO survey of 3CR radio sources: Further evidence for the unified schemes

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