# 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 3 # # 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 0.0017 0.0001 0.0001 0.0000 0.0000 KFILTER_SDSS 3030 0.0085 0.0008 0.0004 0.0002 0.0001 KFILTER_SDSS 3055 0.0151 0.0018 0.0011 0.0006 0.0004 KFILTER_SDSS 3080 0.0228 0.0035 0.0022 0.0013 0.0008 KFILTER_SDSS 3105 0.0350 0.0064 0.0042 0.0027 0.0018 KFILTER_SDSS 3130 0.0519 0.0109 0.0075 0.0052 0.0035 KFILTER_SDSS 3155 0.0719 0.0183 0.0133 0.0096 0.0070 KFILTER_SDSS 3180 0.0921 0.0267 0.0202 0.0152 0.0115 KFILTER_SDSS 3205 0.1099 0.0350 0.0272 0.0211 0.0164 KFILTER_SDSS 3230 0.1262 0.0429 0.0340 0.0269 0.0213 KFILTER_SDSS 3255 0.1421 0.0509 0.0409 0.0328 0.0264 KFILTER_SDSS 3280 0.1563 0.0582 0.0473 0.0384 0.0312 KFILTER_SDSS 3305 0.1674 0.0647 0.0532 0.0437 0.0359 KFILTER_SDSS 3330 0.1765 0.0705 0.0584 0.0484 0.0401 KFILTER_SDSS 3355 0.1848 0.0758 0.0633 0.0529 0.0442 KFILTER_SDSS 3380 0.1927 0.0805 0.0676 0.0567 0.0476 KFILTER_SDSS 3405 0.1999 0.0850 0.0717 0.0604 0.0510 KFILTER_SDSS 3430 0.2056 0.0884 0.0747 0.0632 0.0535 KFILTER_SDSS 3455 0.2092 0.0913 0.0776 0.0659 0.0560 KFILTER_SDSS 3480 0.2112 0.0947 0.0810 0.0694 0.0594 KFILTER_SDSS 3505 0.2128 0.0979 0.0845 0.0729 0.0629 KFILTER_SDSS 3530 0.2137 0.1002 0.0869 0.0754 0.0654 KFILTER_SDSS 3555 0.2139 0.1016 0.0885 0.0770 0.0670 KFILTER_SDSS 3580 0.2140 0.1027 0.0896 0.0782 0.0683 KFILTER_SDSS 3605 0.2145 0.1040 0.0910 0.0796 0.0697 KFILTER_SDSS 3630 0.2147 0.1053 0.0925 0.0812 0.0713 KFILTER_SDSS 3655 0.2135 0.1061 0.0935 0.0824 0.0726 KFILTER_SDSS 3680 0.2109 0.1062 0.0939 0.0830 0.0734 KFILTER_SDSS 3705 0.2067 0.1053 0.0934 0.0828 0.0735 KFILTER_SDSS 3730 0.1989 0.1024 0.0910 0.0809 0.0720 KFILTER_SDSS 3755 0.1862 0.0966 0.0861 0.0768 0.0684 KFILTER_SDSS 3780 0.1691 0.0885 0.0790 0.0706 0.0630 KFILTER_SDSS 3805 0.1490 0.0786 0.0703 0.0630 0.0563 KFILTER_SDSS 3830 0.1266 0.0674 0.0604 0.0542 0.0486 KFILTER_SDSS 3855 0.1026 0.0551 0.0496 0.0446 0.0401 KFILTER_SDSS 3880 0.0766 0.0416 0.0375 0.0338 0.0305 KFILTER_SDSS 3905 0.0494 0.0271 0.0245 0.0222 0.0201 KFILTER_SDSS 3930 0.0268 0.0149 0.0135 0.0123 0.0111 KFILTER_SDSS 3955 0.0139 0.0078 0.0071 0.0065 0.0059 KFILTER_SDSS 3980 0.0078 0.0044 0.0040 0.0037 0.0034 KFILTER_SDSS 4005 0.0040 0.0023 0.0021 0.0019 0.0018 KFILTER_SDSS 4030 0.0018 0.0011 0.0010 0.0009 0.0008 KFILTER_SDSS 4055 0.0009 0.0006 0.0005 0.0005 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 0.0001 KFILTER_SDSS 4130 0.0000 0.0000 0.0000 0.0000 0.0000