Data Reduction Frequently Asked Questions
Are there any colour transformations available for the HAWK-I filters and another filter system?
The UK in-kind HAWK-I archive reprocessing and new ESO HAWK-I imaging pipeline use the 2MASS catalogue to astrometrically and photometrically calibrate the science fields.
The colour transformations used for the conversion between the HAWK-I photometric system and the system used for photometric calibration (e.g. 2MASS) can be found in the fits tables included in the data distribution (HIERARCH ESO PRO CATG = PHOTCAL_TAB).
For the current HAWK-I detectors and filters, the transformations to the 2MASS filters are:
Y = 1.52 * Jmag - 0.52 * Hmag
J = 0.85 * Jmag + 0.15 * Hmag
H = 0.06 * Jmag + 0.94 * Hmag
Ks = 0.03 * Jmag + 0.97 * Kmag
CH4 = 0.06 * Jmag + 0.94 * Hmag
H2 = 0.03 * Jmag + 0.97 * Kmag
BrG = 0.03 * Jmag + 0.97 * Kmag
NB0984 = 1.62 * Jmag - 0.62 * Hmag
NB1060 = 1.50 * Jmag - 0.50 * Hmag
NB1190 = 0.85 * Jmag + 0.15 * Hmag
NB2090 = 0.03 * Jmag + 0.97 * Kmag