An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 2 Search : Lyman break
Lyman break
  بُره‌ی ِ لایمن   
bore-ye Lyman

Fr.: coupure de Lyman   

The dividing point in a galaxy's spectrum at wavelengths shorter than the → Lyman limit. Galaxies contain large amounts of → neutral hydrogen which is very effective at absorbing radiation shortward of 912 Å. Hence galaxies are virtually dark at these wavelengths.

Lyman; → break.

Lyman break galaxy
  کهکشان با بُره‌ی ِ لایمن   
kahkešân bâ bore-ye Lyman

Fr.: galaxie de la coupure de Lyman   

A star-forming galaxy at → high redshift affected by the → Lyman break. Such a galaxy is detected in the red (R, → photometric band) but not in the blue (U and B bands). At those high redshfits (above 2.5), the → Lyman limit at 912 Å is shifted between the U and B bands.

Lyman; → break; → galaxy.