Journal Article

A multifrequency study of the large radio galaxies 3C46 and 3C452

S. Nandi, A. Pirya, S. Pal, C. Konar, D. J. Saikia and M. Singh

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 404, issue 1, pages 433-441
Published in print May 2010 | ISSN: 0035-8711
Published online April 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16286.x
A multifrequency study of the large radio galaxies 3C46 and 3C452

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We present low-frequency observations starting from ∼150 MHz with the Giant Metrewave Radio Telescope, and high-frequency observations with the Very Large Array of two large radio galaxies 3C46 and 3C452. These observations were made with the objectives of estimating their spectral ages and examining any evidence of diffuse extended emission at low radio frequencies due to an earlier cycle of activity. While no evidence of extended emission due to an earlier cycle of activity has been found, the spectral ages have been estimated to be ∼15 and 27 Myr for the oldest relativistic plasma seen in the regions close to the cores for 3C46 and 3C452, respectively. The spectra in the vicinity of the hotspots are consistent with a straight spectrum with injection spectral indices of ∼1.0 and 0.78, respectively, somewhat steeper than theoretical expectations.

Keywords: galaxies: active; galaxies: jets; galaxies: nuclei; quasars: general; radio continuum: galaxies

Journal Article.  4302 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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