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Title: Giant Metrewave Radio Telescope Observations of Head–Tail Radio Galaxies

Abstract

We present results from a study of seven large known head–tail radio galaxies based on observations using the Giant Metrewave Radio Telescope at 240 and 610 MHz. These observations are used to study the radio morphologies and distribution of the spectral indices across the sources. The overall morphology of the radio tails of these sources is suggestive of random motions of the optical host around the cluster potential. The presence of multiple bends and wiggles in several head–tail sources is possibly due to the precessing radio jets. We find steepening of the spectral index along the radio tails. The prevailing equipartition magnetic field also decreases along the radio tails of these sources. These steepening trends are attributed to the synchrotron aging of plasma toward the ends of the tails. The dynamical ages of these sample sources have been estimated to be ∼10{sup 8} yr, which is a factor of six more than the age estimates from the radiative losses due to synchrotron cooling.

Authors:
; ;  [1]
  1. National Center for Radio Astrophysics—Tata Institute of Fundamental Research Post Box 3, Ganeshkhind P.O., Pune 41007 (India)
Publication Date:
OSTI Identifier:
22663136
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (Online); Journal Volume: 154; Journal Issue: 4; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AGING; COOLING; GALAXY NUCLEI; INDEXES; JETS; MAGNETIC FIELDS; MHZ RANGE; MORPHOLOGY; RADIO GALAXIES; RADIO TELESCOPES; RANDOMNESS

Citation Formats

Sebastian, Biny, Lal, Dharam V., and Rao, A. Pramesh, E-mail: biny@ncra.tifr.res.in. Giant Metrewave Radio Telescope Observations of Head–Tail Radio Galaxies. United States: N. p., 2017. Web. doi:10.3847/1538-3881/AA88D0.
Sebastian, Biny, Lal, Dharam V., & Rao, A. Pramesh, E-mail: biny@ncra.tifr.res.in. Giant Metrewave Radio Telescope Observations of Head–Tail Radio Galaxies. United States. doi:10.3847/1538-3881/AA88D0.
Sebastian, Biny, Lal, Dharam V., and Rao, A. Pramesh, E-mail: biny@ncra.tifr.res.in. Sun . "Giant Metrewave Radio Telescope Observations of Head–Tail Radio Galaxies". United States. doi:10.3847/1538-3881/AA88D0.
@article{osti_22663136,
title = {Giant Metrewave Radio Telescope Observations of Head–Tail Radio Galaxies},
author = {Sebastian, Biny and Lal, Dharam V. and Rao, A. Pramesh, E-mail: biny@ncra.tifr.res.in},
abstractNote = {We present results from a study of seven large known head–tail radio galaxies based on observations using the Giant Metrewave Radio Telescope at 240 and 610 MHz. These observations are used to study the radio morphologies and distribution of the spectral indices across the sources. The overall morphology of the radio tails of these sources is suggestive of random motions of the optical host around the cluster potential. The presence of multiple bends and wiggles in several head–tail sources is possibly due to the precessing radio jets. We find steepening of the spectral index along the radio tails. The prevailing equipartition magnetic field also decreases along the radio tails of these sources. These steepening trends are attributed to the synchrotron aging of plasma toward the ends of the tails. The dynamical ages of these sample sources have been estimated to be ∼10{sup 8} yr, which is a factor of six more than the age estimates from the radiative losses due to synchrotron cooling.},
doi = {10.3847/1538-3881/AA88D0},
journal = {Astronomical Journal (Online)},
number = 4,
volume = 154,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2017},
month = {Sun Oct 01 00:00:00 EDT 2017}
}