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Full Width At Half Maximum

(a measure of the width of a hump-shaped curve)

Full Width At Half Maximum (FWHM) is a means of citing something about the width of the curved plot of a function where the plot is shaped like a hump or valley from some "usual" value to an extreme maximum or minimum. The Gaussian Function with its Bell Curve is such a function.

Astrophysics uses it as a means to quantify the width of a Spectral Line, e.g., in formulae that relate the width to other quantities. It is also used for some other functions graph such a shape such as Passband specifications.


Referenced by:
I Band
K Band
Line Broadening
R Band
Strömgren Photometric System