Central wavelengths and zero points
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Jump to navigationJump to searchHere is a large collection of central wavelengths and zero points, useful for converting between flux densities and magnitudes, and for adding points into an SED.
band wavelength (um) zero point (Jy) J 1.25 1594 H 1.65 1024 Ks 2.17 666.7 Kshort not Johnson K!
I1 3.6 280.9 I2 4.5 179.7 I3 5.8 115.0 I4 8.0 64.13
M1 24 7.14 M2 70 0.775 M3 160 0.159
W1 3.4 309.54 W2 4.6 171.79 W3 12 31.676 W4 22 8.3635
U 0.36 1755 B 0.44 4000.87 V 0.55 3597.28 Rc 0.71 3080 !! Cousins R (not the same as Johnson R)! Ic 0.79 2432.84 !! Cousins I (not the same as Johnson I)!
sloan u 2910*1d-4 !! 2910 A, and there are 10^-4 um per A. (etc for rest) sloan g 4810*1d-4 sloan r 6230*1d-4 sloan i 7640*1d-4 sloan z 9060*1d-4
BE CAREFUL to keep track of whether you are working with Vega-based magnitudes or AB mags. Vega magnitudes define things with respect to a Vega spectrum (see Units page), but some folks (largely extragalactic folks) define things with respect to a flat spectrum source instead, and those are AB mags. Most Sloan folks (even those folks working with stars) work in AB mags instead. For AB mags, you always use a flat reference spectrum, so the zero point is 3631 Jy for all bands.