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High Frequency Peakers

Published online by Cambridge University Press:  05 March 2013

Daniele Dallacasa
Daniele Dallacasa*
Affiliation:
Dipartimento di Astronomia, Università di Bologna, Via Ranzani 1, I-40127, Bologna, Italy. ddallaca@ira.cnr.it
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Abstract

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There is quite a clear anticorrelation between the intrinsic peak frequency and the overall radio source size in compact steep spectrum (CSS) and gigahertz peaked spectrum (GPS) radio sources. This feature is interpreted in terms of synchrotron self-absorption (although free–free absorption may play a role as well) of the radiation emitted by a small radio source which is growing within the inner region of the host galaxy. This leads to the hypothesis that these objects are young and that the radio source is still developing/expanding within the host galaxy itself.

Very young radio sources must have the peak in their radio spectra occurring above a few tens of gigahertz, and for this reason they are termed high frequency peakers (HFPs). These newly born radio sources must be very rare given that they spend very little time in this stage. Ho = 100 km s−1 Mpc−1 and qo = 0.5 are used throughout this paper.

Keywords

galaxies: activeradio continuum: galaxies
Type
GPS/CSS Workshop
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 1 , 2003 , pp. 79 - 84
Copyright
Copyright © Astronomical Society of Australia 2003

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