Astrophysics (index)


(means of identifying distant galaxies)

A means of identifying distant galaxies through Photometry is identify Dropouts: if images have been taken over a set of Passbands, then a high Redshift (z) will cause some of the galaxy's usually strong Electromagnetic Radiation (EMR) bands (e.g., the high point of its Black Body (BB) spectrum) to be shifted to the degree that the images for 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.

BDBD3Dropoutgeneral for "blue dropout"
RDRD1Dropoutgeneral for "red dropout"