# 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): i # # 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 6430 0.0000 0.0000 0.0000 0.0000 0.0000 KFILTER_SDSS 6480 0.0004 0.0003 0.0003 0.0003 0.0003 KFILTER_SDSS 6530 0.0007 0.0005 0.0005 0.0005 0.0005 KFILTER_SDSS 6580 0.0006 0.0005 0.0005 0.0004 0.0004 KFILTER_SDSS 6630 0.0015 0.0011 0.0011 0.0010 0.0010 KFILTER_SDSS 6680 0.0050 0.0036 0.0035 0.0034 0.0033 KFILTER_SDSS 6730 0.0173 0.0122 0.0120 0.0117 0.0115 KFILTER_SDSS 6780 0.0572 0.0409 0.0403 0.0396 0.0390 KFILTER_SDSS 6830 0.1384 0.0971 0.0951 0.0931 0.0912 KFILTER_SDSS 6880 0.2627 0.1747 0.1685 0.1625 0.1567 KFILTER_SDSS 6930 0.3945 0.2684 0.2607 0.2532 0.2460 KFILTER_SDSS 6980 0.4969 0.3510 0.3451 0.3392 0.3335 KFILTER_SDSS 7030 0.5642 0.4025 0.3971 0.3918 0.3865 KFILTER_SDSS 7080 0.6003 0.4390 0.4366 0.4342 0.4318 KFILTER_SDSS 7130 0.6156 0.4402 0.4352 0.4302 0.4252 KFILTER_SDSS 7180 0.6204 0.4070 0.3924 0.3783 0.3647 KFILTER_SDSS 7230 0.6170 0.4187 0.4081 0.3977 0.3876 KFILTER_SDSS 7280 0.6067 0.4093 0.3986 0.3882 0.3780 KFILTER_SDSS 7330 0.5928 0.4111 0.4040 0.3970 0.3902 KFILTER_SDSS 7380 0.5791 0.4029 0.3967 0.3907 0.3847 KFILTER_SDSS 7430 0.5673 0.3947 0.3891 0.3836 0.3781 KFILTER_SDSS 7480 0.5580 0.3857 0.3799 0.3743 0.3687 KFILTER_SDSS 7530 0.5487 0.3737 0.3671 0.3605 0.3541 KFILTER_SDSS 7580 0.5367 0.3643 0.3580 0.3517 0.3456 KFILTER_SDSS 7630 0.5222 0.2449 0.2157 0.1899 0.1673 KFILTER_SDSS 7680 0.5062 0.3437 0.3388 0.3340 0.3292 KFILTER_SDSS 7730 0.4909 0.3332 0.3289 0.3246 0.3204 KFILTER_SDSS 7780 0.4780 0.3226 0.3184 0.3142 0.3101 KFILTER_SDSS 7830 0.4672 0.3127 0.3083 0.3039 0.2996 KFILTER_SDSS 7880 0.4576 0.3051 0.3008 0.2965 0.2923 KFILTER_SDSS 7930 0.4505 0.3022 0.2988 0.2955 0.2921 KFILTER_SDSS 7980 0.4459 0.3028 0.3007 0.2987 0.2966 KFILTER_SDSS 8030 0.4378 0.2988 0.2974 0.2960 0.2946 KFILTER_SDSS 8080 0.4241 0.2851 0.2826 0.2801 0.2776 KFILTER_SDSS 8130 0.4002 0.2574 0.2517 0.2462 0.2408 KFILTER_SDSS 8180 0.3050 0.1888 0.1825 0.1764 0.1705 KFILTER_SDSS 8230 0.1780 0.1092 0.1053 0.1015 0.0978 KFILTER_SDSS 8280 0.0781 0.0491 0.0476 0.0462 0.0448 KFILTER_SDSS 8330 0.0225 0.0149 0.0147 0.0145 0.0142 KFILTER_SDSS 8380 0.0081 0.0055 0.0054 0.0053 0.0052 KFILTER_SDSS 8430 0.0032 0.0022 0.0021 0.0021 0.0021 KFILTER_SDSS 8480 0.0015 0.0010 0.0010 0.0010 0.0009 KFILTER_SDSS 8530 0.0013 0.0009 0.0008 0.0008 0.0008 KFILTER_SDSS 8580 0.0007 0.0005 0.0005 0.0005 0.0004 KFILTER_SDSS 8630 0.0000 0.0000 0.0000 0.0000 0.0000