Astrophysics (index)


(Band, Filter)
(range of electromagnetic wavelengths that a filter allows)

A Passband is a specification of the range and strength of Wavelengths (and in effect, Frequencies) allowed through a Filter that cuts off both high and low wavelengths, i.e., a specification of the wavelengths allowed to pass through the filter. In effect, it is a Sensitivity Function (S). The term is also used to mean the filter itself.

The term is used in engineering disciplines such as communications engineering as well as astronomy. In the latter, a Photometric System, e.g., the UBV Photometric System, is a conventional set of such filter specifications.

The passbands/filters are generally indicated by letter, some being mnemonic for the color, e.g., B for Blue, R for Red, but the same letter may have differing specifications under different systems. Some common passband letters in astronomy:

The letters Z, Y, J, H, K Band, and L are typical of Near Infrared (NIR), and M, N, and Q of Mid Infrared (MIR).


Referenced by:
AB System
Aperture Photometry
Astronomical Survey
Color Index
Full Width At Half Maximum (FWHM)
Galaxy SED
Gas Fraction Estimation
G Band
Gemini Observatory
Hawaii K-Band Galaxy Survey
I Band
JHK Photometric System (JHK)
K Band
Photometric System
R Band
Sensitivity Function (S)
Strömgren Photometric System
Synthetic Photometry
UBV Photometric System
Vega System