Lyman-break galaxy
(LBG)
(a galaxy emitting very little shorter than 912 angstroms)
A Lyman-break galaxy (LBG) is a galaxy
identified as star forming by a Lyman break, a lack of radiation
emitted with wavelength shorter than 912 angstroms,
the Lyman limit, i.e., the lower limit on wavelengths
in the Lyman series. Neutral hydrogen around
star-forming regions absorbs the radiation.
This method of identifying star-forming galaxies is largely used at
redshifts of z in the 3-to-4 range, using filters on the
redshifted spectrum. The method has the advantage that the
"break" causes dropouts, i.e., images through some filters
don't show the galaxy,
providing a relatively easy way to identify them by comparing
the filtered images,
that the break is visible through the Earth's atmosphere
within the 3-4 redshift range,
and that the redshift can be determined with some precision
using subsequent spectrography to identify the wavelength of the
observed break.
(galaxy type)
Further reading:
https://en.wikipedia.org/wiki/Lyman-break_galaxy
http://burro.astr.cwru.edu/Academics/Astr328/Notes/GalForm/LyBreakTech.html
https://www.oxfordreference.com/display/10.1093/oi/authority.20110803100120968
http://ned.ipac.caltech.edu/level5/Giavalisco/Giav_contents.html
https://ned.ipac.caltech.edu/level5/Sept14/Dunlop/Dunlop3.html
Prefix | Example | | |
LBG | LBG J213512.73-010143 | general prefix for LBGs | |
|
Referenced by pages:
Balmer-break galaxy (BBG)
brightest cluster galaxy (BCG)
HD1
Lyman break (LB)
Lyman continuum (LyC)
Index