An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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head-tail galaxy
  کهکشان ِ "سر-دم"  
kahkešân-e sar-dom
Fr.: galaxie tête-queue, ~ têtard  

A member of the class of radio galaxies (→ radio galaxy) that have a strong radio emission coming from a bright “head” and a more diffuse emission from a “tail.” They are often found in clusters.

See also: → head; → tail; → galaxy.