|
conversions
Fluxes from a Zero mag Source and
Conversion of Magnitudes to Janskys and F-Lambda
The tables below give bandpass, effective or isophotal wavelength
or frequency for the bandpass (see
this discussion for important notes on definitions), flux in Wm-2 µm-1 and
Jansky, and AB mags, for a zero magnitude source.
One Jansky represents an incident energy flux density of 10-26
W m-2 Hz-1. The two datasets below were calculated in
slightly different ways but the results agree within 2%.
WFCAM ZY and Mauna Kea Filter Bandpasses
| |
Tokunaga & Vacca 2005 PASP and priv. comm. |
P. Hewett priv. comm. |
| Band |
Isophotal
Wavelength
(µm) |
Flux
(Wm-2 µm-1) |
Isophotal
Frequency
Hz |
S (Jy) |
AB
mag |
Effective
Wavelength
(µm) |
Flux
(Wm-2 µm-1) |
S (Jy) |
AB
mag |
| |
|
|
|
|
|
|
|
|
|
| V |
0.5450 |
3.58E-08 |
5.490E+14 |
3630 |
0.026 |
|
|
|
|
| Z |
0.9206 |
8.74e-09 | 3.071E+14
2270 |
0.535 |
0.8817 |
8.59E-09 |
2232 |
0.528 |
| Y |
1.036 |
5.81e-09 |
2.870E+14 |
2060 |
0.640 |
1.0305 |
5.71E-09 |
2026 |
0.634 |
| J |
1.250 |
3.01e-09 |
2.394E+14 |
1560 |
0.941 |
1.2483 |
2.94E-09 |
1530 |
0.938 |
| H |
1.644 |
1.18e-09 |
1.802E+14 |
1040 |
1.38 |
1.6313 |
1.14E-09 |
1019 |
1.379 |
| K' |
2.121 |
4.57e-10 |
1.413E+14 |
686 |
1.84 |
|
|
|
|
| Ks |
2.149 |
4.35e-10 |
1.395E+14 |
670 |
1.86 |
|
|
|
|
| K |
2.198 |
4.00e-10 |
1.364E+14 |
645 |
1.90 |
2.2010 |
3.89E-10 |
630 |
1.900 |
| L' |
3.754 |
5.31e-11 |
7.982E+13 |
249 |
2.93 |
|
|
|
|
| M' |
4.702 |
2.22e-11 |
6.350E+13 |
163 |
3.40 |
|
|
|
|
Older Filter Bandpasses
Beckwith et al. (1976, ApJ, 208, 390), with modifications at
10 and 20 microns to be consistent with Tokunaga (1984, AJ, 89, 172)
|
Band (µm)
|
S (Jy)
|
Flux (Wm-2 µm-1)
|
| |
|
|
|
V (0.5556)
|
3540
|
3.44e-08
|
|
I (0.9)
|
2250
|
8.25e-09
|
|
J (1.25)
|
1600
|
3.07e-09
|
|
H (1.65)
|
1020
|
1.12e-09
|
|
K (2.20)
|
657
|
4.07e-10
|
|
L (3.45)
|
290
|
7.30e-11
|
|
L'(3.80)
|
252
|
5.24e-11
|
|
M (4.80)
|
163
|
2.12e-11
|
|
(7.8)
|
65.3
|
3.22e-12
|
|
(8.7)
|
53.0
|
2.10e-12
|
|
(9.8)
|
42.3
|
1.32e-12
|
|
N (10.1)
|
39.8
|
1.17e-12
|
|
(10.3)
|
38.5
|
1.09e-12
|
|
(11.6)
|
30.5
|
6.81e-13
|
|
(12.5)
|
26.4
|
5.07e-13
|
|
Q (20.0)
|
10.4
|
7.80e-14
|
|
