What does FR mean in UNCLASSIFIED
FR stands for Fanaroff-Riley, which is a classification system for extragalactic radio sources based on their morphology. The system was developed by Bernard Fanaroff and John Riley in 1974, and it divides radio sources into two main types:
FR meaning in Unclassified in Miscellaneous
FR mostly used in an acronym Unclassified in Category Miscellaneous that means Fanaroff Riley
Shorthand: FR,
Full Form: Fanaroff Riley
For more information of "Fanaroff Riley", see the section below.
FR I Radio Sources
- Typically have a compact core and extended, diffuse lobes.
- Lobe emission is relatively weak compared to the core.
- Have a steep radio spectral index (i.e., the flux density decreases rapidly with increasing frequency).
- Are often associated with young, powerful radio galaxies.
FR II Radio Sources
- Have a bright core and well-defined, symmetric lobes.
- Lobe emission is strong compared to the core.
- Have a flat radio spectral index (i.e., the flux density remains relatively constant with increasing frequency).
- Are often associated with older, less powerful radio galaxies.
Essential Questions and Answers on Fanaroff Riley in "MISCELLANEOUS»UNFILED"
What is Fanaroff Riley (FR) type radio galaxy?
Fanaroff Riley (FR) type radio galaxies are a class of radio galaxies that are characterized by their large and powerful radio jets. These jets are often oriented perpendicular to the galaxy's disk and can extend for millions of light-years into space. FR galaxies are typically found in massive elliptical galaxies and are thought to be powered by the accretion of matter onto a supermassive black hole at the galaxy's center.
What are the different types of FR galaxies?
There are two main types of FR galaxies: FR I and FR II. FR I galaxies have narrow, collimated jets that terminate in bright hotspots. FR II galaxies have wider, more diffuse jets that terminate in faint, diffuse lobes.
What is the difference between FR I and FR II galaxies?
The main difference between FR I and FR II galaxies is the morphology of their radio jets. FR I galaxies have narrow, collimated jets that terminate in bright hotspots, while FR II galaxies have wider, more diffuse jets that terminate in faint, diffuse lobes. FR I galaxies are also typically found in more massive galaxies than FR II galaxies.
What is the cause of the different morphologies of FR I and FR II galaxies?
The different morphologies of FR I and FR II galaxies are thought to be due to differences in the density of the intergalactic medium (IGM) through which the jets propagate. FR I galaxies are thought to propagate through a denser IGM than FR II galaxies, which causes their jets to be more collimated.
What are the implications of the different morphologies of FR I and FR II galaxies?
The different morphologies of FR I and FR II galaxies have implications for the evolution of these galaxies. FR I galaxies are thought to be younger than FR II galaxies, and their jets are thought to be more powerful. FR II galaxies are thought to be more evolved, and their jets are thought to be less powerful.
Final Words: The FR classification system is a useful tool for understanding the structure and evolution of radio galaxies. By dividing sources into two main types, it allows astronomers to study the different properties and behaviors of these objects. The FR classification system is widely used in astronomy and has helped to advance our understanding of the nature of radio galaxies.
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