# Units: # "lambda" is in Angstroms # "pass" is the contribution to the detector signal per photon # entering the atmosphere of Earth (for airmass 1.3) # "pass_1_[069]" are the contribution to the signal for airmasses # 1.0, 1.6, and 1.9 respectively # # Bandpass Name(s): u # # Instrument: SDSS telescope at APO Column 1 # # Determined by: Jim Gunn, Mamoru Doi, Daniel Eisenstein # # Date of determination: 2001-12-18 # # Meaning of/Reason for default column: 1.3 airmass; SDSS magnitudes are # calibrated to this airmass # # Notes: # # Keep in mind that SDSS pipelines are output in the MAYBE magnitude # system, which is currently (2002-08-19) thought to be related to # the AB magnitude system by the offsets: # # u(AB,2.5m) = u(MAYBE,2.5m) - 0.042 # g(AB,2.5m) = g(MAYBE,2.5m) + 0.036 # r(AB,2.5m) = r(MAYBE,2.5m) + 0.015 # i(AB,2.5m) = i(MAYBE,2.5m) + 0.013 # z(AB,2.5m) = z(MAYBE,2.5m) - 0.002 # # See sdss-general/2486 or contact David W. Hogg for details. # # The following notes come from Jim Gunn: # # These files are the response functions as measured by Mamoru Jan 2001, # interpolated to fill in the sharp corner near the red cutoff using model # filters and then splined to a standard wavelengh set, shared by all of # the files in this set of response functions for all the telescopes. # # The files indexed 0 are the response functions averaged over the six # columns of the camera. # # The file sdssav.lis is a list of magnitudes (V=0) and colors for these # (average) response functions at 1.3 airmasses run against the # Gunn-Stryker spectrophotometric atlas stars and the AB95 standards. # These are AB magnitudes, note, not whatever system we will come up with. # To transform from USNO magnitudes to a natural SDSS AB system, the # best-guess transformations as of this writing are # # u_AB = u' - 0.04 - 0.003*(u'-g') # # g_AB = g' + 0.069*(g'-r') # # r_AB = r' + 0.038*(r'-i') # # i_AB = i' + 0.049*(r'-i') # # z_AB = z' - 0.01 + 0.011*(i'-z') # # but these are based ENTIRELY on calculations, and should be much better # determined by observations shortly. # # jeg011218 # typedef struct { double lambda; double vacuum_pass; double pass_1_0; double pass; double pass_1_6; double pass_1_9; } KFILTER_SDSS; KFILTER_SDSS 2980 0.0000 0.0000 0.0000 0.0000 0.0000 KFILTER_SDSS 3005 0.0023 0.0002 0.0001 0.0000 0.0000 KFILTER_SDSS 3030 0.0115 0.0011 0.0006 0.0003 0.0002 KFILTER_SDSS 3055 0.0208 0.0025 0.0015 0.0009 0.0005 KFILTER_SDSS 3080 0.0324 0.0049 0.0031 0.0019 0.0012 KFILTER_SDSS 3105 0.0513 0.0093 0.0061 0.0040 0.0026 KFILTER_SDSS 3130 0.0759 0.0160 0.0110 0.0076 0.0052 KFILTER_SDSS 3155 0.1032 0.0262 0.0191 0.0138 0.0101 KFILTER_SDSS 3180 0.1301 0.0377 0.0285 0.0215 0.0163 KFILTER_SDSS 3205 0.1545 0.0492 0.0382 0.0297 0.0230 KFILTER_SDSS 3230 0.1773 0.0603 0.0477 0.0378 0.0299 KFILTER_SDSS 3255 0.1997 0.0715 0.0575 0.0462 0.0371 KFILTER_SDSS 3280 0.2201 0.0820 0.0666 0.0541 0.0440 KFILTER_SDSS 3305 0.2369 0.0916 0.0753 0.0618 0.0508 KFILTER_SDSS 3330 0.2507 0.1001 0.0830 0.0688 0.0570 KFILTER_SDSS 3355 0.2624 0.1076 0.0899 0.0751 0.0627 KFILTER_SDSS 3380 0.2722 0.1137 0.0955 0.0802 0.0673 KFILTER_SDSS 3405 0.2801 0.1190 0.1004 0.0847 0.0714 KFILTER_SDSS 3430 0.2860 0.1229 0.1040 0.0880 0.0744 KFILTER_SDSS 3455 0.2902 0.1266 0.1076 0.0914 0.0777 KFILTER_SDSS 3480 0.2927 0.1312 0.1123 0.0961 0.0823 KFILTER_SDSS 3505 0.2936 0.1351 0.1166 0.1006 0.0868 KFILTER_SDSS 3530 0.2914 0.1367 0.1186 0.1028 0.0892 KFILTER_SDSS 3555 0.2855 0.1357 0.1181 0.1028 0.0895 KFILTER_SDSS 3580 0.2799 0.1343 0.1172 0.1023 0.0893 KFILTER_SDSS 3605 0.2785 0.1350 0.1181 0.1034 0.0905 KFILTER_SDSS 3630 0.2802 0.1375 0.1207 0.1060 0.0930 KFILTER_SDSS 3655 0.2826 0.1405 0.1238 0.1090 0.0960 KFILTER_SDSS 3680 0.2818 0.1419 0.1255 0.1109 0.0981 KFILTER_SDSS 3705 0.2747 0.1399 0.1241 0.1101 0.0976 KFILTER_SDSS 3730 0.2617 0.1346 0.1197 0.1065 0.0947 KFILTER_SDSS 3755 0.2440 0.1266 0.1128 0.1006 0.0896 KFILTER_SDSS 3780 0.2212 0.1157 0.1033 0.0923 0.0824 KFILTER_SDSS 3805 0.1932 0.1019 0.0912 0.0816 0.0731 KFILTER_SDSS 3830 0.1625 0.0865 0.0776 0.0696 0.0624 KFILTER_SDSS 3855 0.1313 0.0705 0.0634 0.0571 0.0513 KFILTER_SDSS 3880 0.0984 0.0534 0.0482 0.0435 0.0392 KFILTER_SDSS 3905 0.0638 0.0350 0.0317 0.0287 0.0259 KFILTER_SDSS 3930 0.0349 0.0194 0.0176 0.0159 0.0145 KFILTER_SDSS 3955 0.0183 0.0103 0.0094 0.0085 0.0078 KFILTER_SDSS 3980 0.0103 0.0059 0.0054 0.0049 0.0045 KFILTER_SDSS 4005 0.0054 0.0031 0.0029 0.0026 0.0024 KFILTER_SDSS 4030 0.0025 0.0015 0.0014 0.0012 0.0011 KFILTER_SDSS 4055 0.0014 0.0008 0.0007 0.0007 0.0006 KFILTER_SDSS 4080 0.0010 0.0006 0.0005 0.0005 0.0004 KFILTER_SDSS 4105 0.0005 0.0003 0.0002 0.0002 0.0002 KFILTER_SDSS 4130 0.0000 0.0000 0.0000 0.0000 0.0000