# 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 2 # # 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 0.0022 0.0002 0.0001 0.0000 0.0000 KFILTER_SDSS 3030 0.0115 0.0011 0.0006 0.0003 0.0002 KFILTER_SDSS 3055 0.0207 0.0025 0.0015 0.0009 0.0005 KFILTER_SDSS 3080 0.0328 0.0050 0.0031 0.0019 0.0012 KFILTER_SDSS 3105 0.0529 0.0096 0.0063 0.0042 0.0027 KFILTER_SDSS 3130 0.0777 0.0164 0.0113 0.0077 0.0053 KFILTER_SDSS 3155 0.1026 0.0261 0.0189 0.0138 0.0100 KFILTER_SDSS 3180 0.1272 0.0369 0.0279 0.0210 0.0159 KFILTER_SDSS 3205 0.1518 0.0484 0.0376 0.0292 0.0226 KFILTER_SDSS 3230 0.1749 0.0595 0.0471 0.0373 0.0295 KFILTER_SDSS 3255 0.1951 0.0699 0.0561 0.0451 0.0362 KFILTER_SDSS 3280 0.2136 0.0796 0.0646 0.0525 0.0427 KFILTER_SDSS 3305 0.2312 0.0894 0.0734 0.0603 0.0495 KFILTER_SDSS 3330 0.2457 0.0981 0.0813 0.0674 0.0559 KFILTER_SDSS 3355 0.2551 0.1046 0.0874 0.0730 0.0610 KFILTER_SDSS 3380 0.2627 0.1098 0.0921 0.0774 0.0649 KFILTER_SDSS 3405 0.2716 0.1154 0.0973 0.0821 0.0693 KFILTER_SDSS 3430 0.2799 0.1202 0.1017 0.0861 0.0728 KFILTER_SDSS 3455 0.2851 0.1244 0.1057 0.0898 0.0763 KFILTER_SDSS 3480 0.2883 0.1292 0.1106 0.0947 0.0811 KFILTER_SDSS 3505 0.2908 0.1338 0.1154 0.0996 0.0859 KFILTER_SDSS 3530 0.2924 0.1371 0.1189 0.1032 0.0895 KFILTER_SDSS 3555 0.2926 0.1390 0.1210 0.1053 0.0917 KFILTER_SDSS 3580 0.2912 0.1398 0.1220 0.1065 0.0929 KFILTER_SDSS 3605 0.2883 0.1398 0.1223 0.1070 0.0936 KFILTER_SDSS 3630 0.2842 0.1395 0.1224 0.1075 0.0943 KFILTER_SDSS 3655 0.2791 0.1387 0.1222 0.1077 0.0948 KFILTER_SDSS 3680 0.2707 0.1363 0.1205 0.1065 0.0942 KFILTER_SDSS 3705 0.2572 0.1311 0.1162 0.1031 0.0914 KFILTER_SDSS 3730 0.2400 0.1235 0.1098 0.0976 0.0868 KFILTER_SDSS 3755 0.2203 0.1143 0.1019 0.0908 0.0810 KFILTER_SDSS 3780 0.1976 0.1034 0.0923 0.0825 0.0737 KFILTER_SDSS 3805 0.1711 0.0902 0.0808 0.0723 0.0647 KFILTER_SDSS 3830 0.1419 0.0755 0.0677 0.0608 0.0545 KFILTER_SDSS 3855 0.1114 0.0598 0.0538 0.0484 0.0435 KFILTER_SDSS 3880 0.0798 0.0433 0.0391 0.0352 0.0318 KFILTER_SDSS 3905 0.0485 0.0266 0.0241 0.0218 0.0197 KFILTER_SDSS 3930 0.0238 0.0132 0.0120 0.0109 0.0099 KFILTER_SDSS 3955 0.0110 0.0062 0.0056 0.0051 0.0047 KFILTER_SDSS 3980 0.0059 0.0034 0.0031 0.0028 0.0026 KFILTER_SDSS 4005 0.0031 0.0018 0.0016 0.0015 0.0013 KFILTER_SDSS 4030 0.0014 0.0008 0.0007 0.0007 0.0006 KFILTER_SDSS 4055 0.0008 0.0005 0.0004 0.0004 0.0004 KFILTER_SDSS 4080 0.0007 0.0004 0.0004 0.0003 0.0003 KFILTER_SDSS 4105 0.0003 0.0002 0.0002 0.0002 0.0002 KFILTER_SDSS 4130 0.0000 0.0000 0.0000 0.0000 0.0000