# 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 4 # # 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 0.0019 0.0001 0.0001 0.0000 0.0000 KFILTER_SDSS 3030 0.0098 0.0009 0.0005 0.0003 0.0002 KFILTER_SDSS 3055 0.0173 0.0021 0.0012 0.0007 0.0004 KFILTER_SDSS 3080 0.0262 0.0040 0.0025 0.0016 0.0010 KFILTER_SDSS 3105 0.0409 0.0074 0.0049 0.0032 0.0021 KFILTER_SDSS 3130 0.0607 0.0128 0.0088 0.0060 0.0042 KFILTER_SDSS 3155 0.0837 0.0213 0.0155 0.0112 0.0082 KFILTER_SDSS 3180 0.1066 0.0309 0.0233 0.0176 0.0133 KFILTER_SDSS 3205 0.1267 0.0404 0.0313 0.0243 0.0189 KFILTER_SDSS 3230 0.1446 0.0492 0.0389 0.0308 0.0244 KFILTER_SDSS 3255 0.1614 0.0578 0.0464 0.0373 0.0300 KFILTER_SDSS 3280 0.1771 0.0660 0.0536 0.0435 0.0354 KFILTER_SDSS 3305 0.1911 0.0739 0.0607 0.0499 0.0409 KFILTER_SDSS 3330 0.2030 0.0811 0.0672 0.0557 0.0462 KFILTER_SDSS 3355 0.2125 0.0872 0.0728 0.0608 0.0508 KFILTER_SDSS 3380 0.2204 0.0921 0.0773 0.0649 0.0545 KFILTER_SDSS 3405 0.2276 0.0967 0.0816 0.0688 0.0580 KFILTER_SDSS 3430 0.2336 0.1004 0.0849 0.0718 0.0608 KFILTER_SDSS 3455 0.2377 0.1037 0.0881 0.0749 0.0636 KFILTER_SDSS 3480 0.2406 0.1078 0.0923 0.0790 0.0676 KFILTER_SDSS 3505 0.2431 0.1119 0.0965 0.0833 0.0718 KFILTER_SDSS 3530 0.2446 0.1147 0.0995 0.0863 0.0749 KFILTER_SDSS 3555 0.2448 0.1163 0.1013 0.0881 0.0767 KFILTER_SDSS 3580 0.2446 0.1174 0.1024 0.0894 0.0780 KFILTER_SDSS 3605 0.2448 0.1187 0.1039 0.0909 0.0795 KFILTER_SDSS 3630 0.2453 0.1204 0.1057 0.0927 0.0814 KFILTER_SDSS 3655 0.2452 0.1219 0.1074 0.0946 0.0833 KFILTER_SDSS 3680 0.2430 0.1224 0.1082 0.0956 0.0846 KFILTER_SDSS 3705 0.2375 0.1210 0.1073 0.0952 0.0844 KFILTER_SDSS 3730 0.2286 0.1176 0.1046 0.0930 0.0827 KFILTER_SDSS 3755 0.2162 0.1122 0.1000 0.0891 0.0794 KFILTER_SDSS 3780 0.1992 0.1042 0.0931 0.0831 0.0742 KFILTER_SDSS 3805 0.1767 0.0932 0.0834 0.0747 0.0668 KFILTER_SDSS 3830 0.1510 0.0803 0.0721 0.0647 0.0580 KFILTER_SDSS 3855 0.1242 0.0667 0.0600 0.0539 0.0485 KFILTER_SDSS 3880 0.0948 0.0514 0.0464 0.0418 0.0377 KFILTER_SDSS 3905 0.0626 0.0343 0.0311 0.0281 0.0254 KFILTER_SDSS 3930 0.0350 0.0194 0.0176 0.0160 0.0145 KFILTER_SDSS 3955 0.0189 0.0106 0.0097 0.0088 0.0080 KFILTER_SDSS 3980 0.0108 0.0062 0.0056 0.0051 0.0047 KFILTER_SDSS 4005 0.0058 0.0033 0.0030 0.0028 0.0025 KFILTER_SDSS 4030 0.0027 0.0015 0.0014 0.0013 0.0012 KFILTER_SDSS 4055 0.0013 0.0008 0.0007 0.0007 0.0006 KFILTER_SDSS 4080 0.0009 0.0005 0.0005 0.0004 0.0004 KFILTER_SDSS 4105 0.0004 0.0002 0.0002 0.0002 0.0002 KFILTER_SDSS 4130 0.0000 0.0000 0.0000 0.0000 0.0000