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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Multifrequency radio continuum observations (1.4-22GHz) 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 × 10 3yr, 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.

Original languageEnglish
Pages (from-to)2223-2231
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume421
Issue number3
DOIs
Publication statusPublished - Apr 2012
Externally publishedYes

Keywords

  • Galaxies: active
  • Galaxies: jets
  • ISM: jets and outflows
  • Quasars: general
  • Radio continuum: general

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