help

Connection Between Fanaroff-Riley Radio Galaxy Classification and Galaxy Properties

-- Jaydee | September 7, 2022

Question:

There are two main classifications of radio galaxies that I saw (the FR I and FR II classes). But I cannot find any information regarding their formation and what does it tell about the host galaxy. Curiously, the FR II class of radio galaxies are far more common and luminous than the FR I, which I think is very interesting. Is there an underlying mechanism (or a set of mechanisms) that prefer the formation of FR II radio galaxies? What are the information that we can get based on their classification (their black hole growth and their environments, as an example).

-- Jaydee

Answer:

Let me refer you to a nice description of the Fanaroff-Riley (FR) classification and its possible connections to galaxy physical properties found on the NASA/IPAC Extragalactic Database. I believe that this resource can provide the information, including additional references, that you are looking for.

-- Jeff Mangum

Facebook

Twitter

The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
	Founded in 1956, the NRAO provides state-of-the-art radio telescope facilities for use by the international scientific community. NRAO telescopes are open to all astronomers regardless of institutional or national affiliation. Observing time on NRAO telescopes is available on a competitive basis to qualified scientists after evaluation of research proposals on the basis of scientific merit, the capability of the instruments to do the work, and the availability of the telescope during the requested time. NRAO also provides both formal and informal programs in education and public outreach for teachers, students, the general public, and the media.
	The National Science Foundation (NSF) is an independent federal agency created by Congress in 1950 "to promote the progress of science; to advance the national health, prosperity, and welfare; to secure the national defense..."
	AUI collaborates with the scientific community and research sponsors to plan, build, and operate cutting-edge facilities. We cultivate excellence, deliver value, enhance education, and engage the public.