mfouesneau
The difference of wise-w3 transmit curve with SVO
I found there is an obvious difference in W3 transmit curves between pyphot and SVO. This difference affects the conversion from spectrum to synthetic photometry. I don't know which curve is correct. Could anyone please explain this problem?
The SVO W3 transmit curve is from http://svo2.cab.inta-csic.es/theory/fps/index.php
The difference between pyphot and SVO is as follows:
SVO reports WISE to be an energy counter while pyphot has it as photon counter. By eye, it seems that SVO has defined their transmission as wavelength * pyphot transmission, which would explain the slope while the features seem the same.
https://www.researchgate.net/figure/WISE-photon-counting-relative-system-response-RSR-curves-lRl-normalized-to-unity_fig14_231135277
But I do not know which one is the original definition. As long as they are consistently used, that should work.
What differences in the magnitudes do you get?
This issue has not been active. I assume the difference in the definition of photon vs. energy of the passbands that causes the difference. If you have more information, please reopen.