2008
DOI: 10.1111/j.1365-2966.2007.12772.x
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A multifrequency study of giant radio sources – II. Spectral ageing analysis of the lobes of selected sources

Abstract: Multifrequency observations with the Giant Metrewave Radio Telescope (GMRT) and the Very Large Array (VLA) are used to determine the spectral breaks in consecutive strips along the lobes of a sample of selected giant radio sources (GRSs) in order to estimate their spectral ages. The maximum spectral ages estimated for the detected radio emission in the lobes of our sources range from ∼6 to 46 Myr with a median value of ∼23 Myr using the classical equipartition fields. Using the magnetic field estimates from th… Show more

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Cited by 73 publications
(102 citation statements)
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References 45 publications
(66 reference statements)
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“…3.2.1). We noticed that the spectral behaviour in the S-like feature is in concordance with that determined in others FRII objects (see for instance Jamrozy et al 2008or Orrù et al 2010) and in radio sources with an hybrid appearance sharing properties of the FRI and FRII-type galaxies (Pirya et al 2011). …”
Section: Morphological Propertiessupporting
confidence: 88%
“…3.2.1). We noticed that the spectral behaviour in the S-like feature is in concordance with that determined in others FRII objects (see for instance Jamrozy et al 2008or Orrù et al 2010) and in radio sources with an hybrid appearance sharing properties of the FRI and FRII-type galaxies (Pirya et al 2011). …”
Section: Morphological Propertiessupporting
confidence: 88%
“…Jamrozy et al 2008;Harwood et al 2013). This increase in synchrotron age arises due to a backflow of plasma carrying freshly injected electrons away from the hotspot towards the AGN core in FR-IIs.…”
Section: Spatial Distribution Of Electron Agesmentioning
confidence: 99%
“…GRGs have been observed at both low and high frequencies to study their morphological character, magnetic field distribution and flux density. It is believed that the lobes of GRGs are moving outwards through the low-density (10 −5 −10 −6 cm −3 ) intergalactic medium (IGM), and their estimated spectral ages are about 10 7 −10 8 years (Mack et al 1998;Jamrozy et al 2008).…”
Section: Introductionmentioning
confidence: 99%