An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

Homepage  Preliminaries  Abbreviations  Acknowledgments  References 
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Fanaroff-Riley Class I (FR-I)
  رده‌ی ِ فاناروف-رایلی I  
rade-ye Fanarof-Riley I
Fr.: Fanaroff-Riley de type I  

In the → Fanaroff-Riley classification, sources with RFR < 0.5. Fanaroff and Riley (1974) found that nearly all sources with luminosity L(178MHz) ≤ 2 × 1025h100-2 W Hz-1 sr-1 were of class I. FR-I → radio jets are thought to be → subsonic, possibly due to mass entrainment, which makes them amenable to distortions in the interaction with the ambient medium.

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