## Magnitude Scale Zero Points

We converted magnitude-based photometry to fluxes using the following zero points.

Band Reference lambda Zero pt (Jy) Zero pt (Jy)
(microns) (Vega) (alpha=1)
U 0.36 1317 1779
B 0.44 4333 4047
V 0.54 3647 3536
R 0.70 2791 2869
I 0.90 1871 2339
J 1.25 1567 1657
H 1.65 1016 1053
K 2.20 687 710
N34 3.40 325 321
L' 3.80 256 270
M 4.8 161 167
N 10.1 39 38
Q 20.25 9.8 11

The zero points correspond to a system in which the magnitude of Vega is exactly zero. Values are given for an object with the same spectrum as Vega and for an object with a flat energy distribution (power law spectrum $F(\nu) = \nu^{-\alpha}$ of slope alpha=1).