# 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 Average over columns 1-6 # # 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 0.0006 0.0004 0.0004 0.0004 0.0004 KFILTER_SDSS 6580 0.0004 0.0003 0.0003 0.0003 0.0003 KFILTER_SDSS 6630 0.0013 0.0009 0.0009 0.0009 0.0009 KFILTER_SDSS 6680 0.0047 0.0034 0.0033 0.0032 0.0032 KFILTER_SDSS 6730 0.0145 0.0103 0.0101 0.0099 0.0097 KFILTER_SDSS 6780 0.0479 0.0343 0.0337 0.0332 0.0327 KFILTER_SDSS 6830 0.1196 0.0839 0.0822 0.0805 0.0788 KFILTER_SDSS 6880 0.2333 0.1552 0.1497 0.1443 0.1392 KFILTER_SDSS 6930 0.3569 0.2428 0.2359 0.2291 0.2226 KFILTER_SDSS 6980 0.4559 0.3221 0.3166 0.3113 0.3060 KFILTER_SDSS 7030 0.5232 0.3733 0.3683 0.3633 0.3584 KFILTER_SDSS 7080 0.5603 0.4098 0.4075 0.4053 0.4031 KFILTER_SDSS 7130 0.5769 0.4125 0.4078 0.4031 0.3985 KFILTER_SDSS 7180 0.5827 0.3823 0.3686 0.3553 0.3426 KFILTER_SDSS 7230 0.5803 0.3938 0.3838 0.3740 0.3645 KFILTER_SDSS 7280 0.5709 0.3852 0.3751 0.3653 0.3557 KFILTER_SDSS 7330 0.5585 0.3873 0.3806 0.3740 0.3676 KFILTER_SDSS 7380 0.5469 0.3805 0.3747 0.3690 0.3633 KFILTER_SDSS 7430 0.5375 0.3739 0.3686 0.3634 0.3582 KFILTER_SDSS 7480 0.5302 0.3664 0.3610 0.3556 0.3503 KFILTER_SDSS 7530 0.5223 0.3557 0.3494 0.3431 0.3370 KFILTER_SDSS 7580 0.5112 0.3470 0.3409 0.3350 0.3292 KFILTER_SDSS 7630 0.4976 0.2334 0.2055 0.1810 0.1594 KFILTER_SDSS 7680 0.4833 0.3282 0.3235 0.3189 0.3143 KFILTER_SDSS 7730 0.4697 0.3188 0.3147 0.3106 0.3066 KFILTER_SDSS 7780 0.4581 0.3092 0.3051 0.3011 0.2971 KFILTER_SDSS 7830 0.4479 0.2998 0.2955 0.2913 0.2872 KFILTER_SDSS 7880 0.4385 0.2924 0.2882 0.2842 0.2801 KFILTER_SDSS 7930 0.4312 0.2893 0.2861 0.2828 0.2796 KFILTER_SDSS 7980 0.4260 0.2893 0.2873 0.2854 0.2834 KFILTER_SDSS 8030 0.4184 0.2856 0.2842 0.2829 0.2815 KFILTER_SDSS 8080 0.4058 0.2729 0.2705 0.2681 0.2657 KFILTER_SDSS 8130 0.3783 0.2433 0.2379 0.2327 0.2276 KFILTER_SDSS 8180 0.2767 0.1713 0.1655 0.1600 0.1547 KFILTER_SDSS 8230 0.1494 0.0917 0.0883 0.0851 0.0821 KFILTER_SDSS 8280 0.0608 0.0382 0.0370 0.0359 0.0348 KFILTER_SDSS 8330 0.0176 0.0117 0.0115 0.0113 0.0111 KFILTER_SDSS 8380 0.0071 0.0048 0.0047 0.0047 0.0046 KFILTER_SDSS 8430 0.0029 0.0020 0.0020 0.0019 0.0019 KFILTER_SDSS 8480 0.0014 0.0010 0.0010 0.0010 0.0009 KFILTER_SDSS 8530 0.0013 0.0009 0.0009 0.0009 0.0009 KFILTER_SDSS 8580 0.0007 0.0005 0.0005 0.0005 0.0005 KFILTER_SDSS 8630 0.0000 0.0000 0.0000 0.0000 0.0000