Journal Article

The radio spectra of reddened Two Micron All Sky Survey quasi-stellar objects: evidence for young radio jets

A. Georgakakis, M. Grossi, J. Afonso and A. M. Hopkins

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 3, pages 2223-2231
Published in print April 2012 | ISSN: 0035-8711
Published online April 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20446.x
The radio spectra of reddened Two Micron All Sky Survey quasi-stellar objects: evidence for young radio jets

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Multifrequency radio continuum observations (1.4–22 GHz) of a sample of reddened quasi-stellar objects (QSOs) are presented. We find a high incidence (13/16) of radio spectral properties, such as low-frequency turnovers, high-frequency spectral breaks or steep power-law slopes, similar to those observed in powerful compact steep spectrum (CSS) and gigahertz-peaked spectrum (GPS) sources. The radio data are consistent with relatively young radio jets with synchrotron ages yr. This calculation is limited by the lack of high-resolution (milliarcsec) radio observations. For the one source in the sample that such data are available a much younger radio age is determined, ≲ 2 × 103 yr, similar to those of GPS/CSS sources. These findings are consistent with claims that reddened QSOs are young systems captured at the first stages of the growth of their supermassive black holes. It also suggests that expanding radio lobes may be an important feedback mode at the early stages of the evolution of active galactic nuclei.

Keywords: ISM: jets and outflows; galaxies: active; galaxies: jets; quasars: general; radio continuum: general

Journal Article.  7290 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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