An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Type 1 Seyfert (Sy 1)
  کهکشان ِ سیفرت ِ گونه‌ی ِ ۱  
kahkešân-e Seyfert-e guné-ye 1
Fr.: galaxie Seyfer de type 1  

A type of → Seyfert galaxy showing both broad and narrow spectral emission lines. The widths of the broad lines indicates velocities around 1000 km s-1. Sy 1 galaxies are also very bright sources of UV and X-ray emission.

See also: → type; → one; → Seyfert galaxy.