The radio spectra of reddened 2MASS QSOs: evidence for young radio jets

Details The radio spectra of reddened 2MASS QSOs: evidence for young radio jets The radio spectra of reddened 2MASS QSOs: evidence for young radio jets

2012-01-18

arxiv.org/abs/1201.3922v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

9 pages, to appear in MNRAS

Scientific paper

Multifrequency radio continuum observations (1.4-22 GHz) of a sample of reddened 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 synchotron ages <1e6-1e7yr. This calculation is limited by the lack of high resolution (milli-arcsec) radio observations. For the one source in the sample that such data are available a much younger radio age is determined, <2e3yr, 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 AGN.

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