dropout
(means of identifying distant galaxies)
Dropouts are a means of identifying candidates for distant
galaxies through photometry. A dropout is the
instance of a source showing in some bands but not
others. A high redshift will cause some of the galaxy's
typically strong electromagnetic radiation (EMR) bands (e.g., the high point
of its black body spectrum) to be shifted to the degree
that the images taken in some bands do not show the galaxy
at all. Given a set of bands, a galaxy that shows in
bands up to, but not including an R band can be termed
a red dropout galaxy. Similarly for a blue dropout galaxy.
The term OIR-dark galaxy is also used, for those that
show in neither optical nor near infrared
The advantage of the method for locating distant galaxies is that
a few images of a single field of view provide information on multiple
galaxies, hinting as to which ones might be extremely distant,
reducing the necessary spectrography to identify examples.
(technique,galaxies,observation,photometry)
Further reading:
https://en.wikipedia.org/wiki/Dropout_(astronomy)
https://home.ifa.hawaii.edu/users/cowie/ast626_dir/early.pdf
https://www.astro.princeton.edu/~jgreene/AST542/Cook_PhotometricDrop-Outs.pdf
https://astronomynow.com/news/n0911/09dropout/
Prefix | Example | | |
BD | BD3 | general for "blue dropout" | |
RD | RD1 | general for "red dropout" | |
|
Referenced by pages:
band shifting
first galaxies
Gamow Explorer
HD1
Hubble Ultra-Deep Field (HUDF)
Lyman break (LB)
Lyman continuum (LyC)
Lyman-break galaxy (LBG)
Index