Isophotal wavelengths, isophotal frequencies, and flux densities
for Vega for the MKO-NIR filters
May 2005
The Mauna Kea Observatories Near-Infrared filter set is defined in the papers by
D.A. Simons and A.T. Tokunaga (2002, PASP, 114, 169) and A.T. Tokunaga, D.A.
Simons, and W.D.Vacca (2002, PASP, 114, 180). These filters were designed to
minimize the effects of water vapor at observatories at altitudes of greater than
or equal to 2 km. Additional information on these filters can be found at:
www.ifa.hawaii.edu/~tokunaga/. Cold filter scans can be found at:
http://irtfweb.ifa.hawaii.edu/~nsfcam/filters.html.
The isophotal wavelengths, isophotal frequencies, and flux densities for Vega were
published in Tokunaga and Vacca (2005, PASP, 117, 421); note the erratum. A
summary of the results are shown in the following tables. The Z and Y filters
(0.921 and 1.036 microns respectively) used by the UKIRT Wide-Field Camera have
been added to the tables below. For information on WFCAM, see
www.jach.hawaii.edu/UKIRT/instruments/wfcam/
Isophotal wavelengths and flux densities for Vega.
Filter Wavel> F-lambda
um (W/m2/um)
V 0.5450 3.58E-08
Z 0.9206 8.74E-09
Y 1.036 5.81E-09
J 1.250 3.01E-09
H 1.644 1.18E-09
K' 2.121 4.57E-10
Ks 2.149 4.35E-10
K 2.198 4.00E-10
L' 3.754 5.31E-11
M' 4.702 2.22E-11
Isophotal frequency, flux density, and AB mag for Vega.
Filter Freq F-nu AB mag
(Hz) (Jy)
V 5.490E+14 3630 0.026
Z 3.071E+14 2270 0.535
Y 2.870E+14 2060 0.64
J 2.394E+14 1560 0.941
H 1.802E+14 1040 1.38
K' 1.413E+14 686 1.84
Ks 1.395E+14 670 1.86
K 1.364E+14 645 1.90
L' 7.982E+13 249 2.93
M' 6.350E+13 163 3.40