An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Fanaroff-Riley Class II (FR-II)
  رده‌ی ِ فاناروف-رایلی II  
radeh-ye Fanarof-Riley II
Fr.: Fanaroff-Riley de type II  

In the → Fanaroff-Riley classification, → radio sources with hotspots in their lobes at distances from the center which are such that RFR > 0.5. The → radio jets in FR-II sources are expected to be highly → supersonic, allowing them to travel large distances.

See also: → Fanaroff-Riley classification; → class.