Models developed to describe FR IIb and FR IIa radio sources

Details Models developed to describe FR IIb and FR IIa radio sources Models developed to describe FR IIb and FR IIa radio sources

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002newar..46...47d&link_type=abstract

New Astronomy Reviews, Volume 46, Issue 2-7, p. 47-60.

Astronomy and Astrophysics

Astronomy

5

Scientific paper

Several models developed to describe the properties of FRIIa and FRIIb radio sources are compared and contrasted here. The fundamental picture of a classical double (edge-brightened, FRII) radio source powered by highly collimated outflows from a central compact object is common to most models. However, models do differ substantially, and some of the key differences are discussed here. Models must be tested and constrained by comparisons with radio data. The extensive, detailed, radio data that can be used to constrain the physical properties of FRII sources will be described. The radio bridge properties of FRII sources indicates they should be divided into two categories: FRIIa and FRIIb sources. Low-power FRIIa sources are typically found at low-redshift and have distorted radio bridge structure. High-power FRIIb sources are typically found at high-redshift and have fairly regular, `cigar-like' bridge shapes. It is anticipated that two model formalisms may be needed to describe FRIIb and FRIIa sources. Unlike FRIIa sources, FRIIb sources are found to inhabit gaseous environments similar to those found in low-redshift clusters of galaxies, though the sources have redshifts between zero and two. Thus, FRIIb sources most likely lie in clusters of galaxies. The importance of X-ray measurements to determine the density and temperature of the gas in the vicinity of FRIIb sources is stressed.

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