# 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 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 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 0.0011 0.0008 0.0008 0.0007 0.0007 KFILTER_SDSS 6680 0.0036 0.0026 0.0025 0.0025 0.0024 KFILTER_SDSS 6730 0.0100 0.0071 0.0069 0.0068 0.0067 KFILTER_SDSS 6780 0.0350 0.0250 0.0246 0.0242 0.0239 KFILTER_SDSS 6830 0.0977 0.0686 0.0671 0.0658 0.0644 KFILTER_SDSS 6880 0.2076 0.1381 0.1331 0.1284 0.1238 KFILTER_SDSS 6930 0.3342 0.2274 0.2209 0.2146 0.2084 KFILTER_SDSS 6980 0.4431 0.3130 0.3077 0.3025 0.2973 KFILTER_SDSS 7030 0.5217 0.3722 0.3672 0.3623 0.3574 KFILTER_SDSS 7080 0.5667 0.4144 0.4122 0.4099 0.4077 KFILTER_SDSS 7130 0.5880 0.4204 0.4156 0.4109 0.4061 KFILTER_SDSS 7180 0.5966 0.3914 0.3774 0.3638 0.3507 KFILTER_SDSS 7230 0.5955 0.4041 0.3939 0.3839 0.3741 KFILTER_SDSS 7280 0.5864 0.3956 0.3853 0.3752 0.3653 KFILTER_SDSS 7330 0.5735 0.3977 0.3908 0.3841 0.3775 KFILTER_SDSS 7380 0.5613 0.3905 0.3845 0.3786 0.3729 KFILTER_SDSS 7430 0.5511 0.3834 0.3780 0.3726 0.3673 KFILTER_SDSS 7480 0.5430 0.3753 0.3697 0.3642 0.3588 KFILTER_SDSS 7530 0.5341 0.3638 0.3573 0.3509 0.3447 KFILTER_SDSS 7580 0.5219 0.3543 0.3481 0.3420 0.3361 KFILTER_SDSS 7630 0.5078 0.2381 0.2097 0.1847 0.1627 KFILTER_SDSS 7680 0.4940 0.3355 0.3307 0.3259 0.3213 KFILTER_SDSS 7730 0.4808 0.3264 0.3222 0.3180 0.3139 KFILTER_SDSS 7780 0.4684 0.3161 0.3120 0.3079 0.3038 KFILTER_SDSS 7830 0.4566 0.3056 0.3013 0.2970 0.2928 KFILTER_SDSS 7880 0.4456 0.2971 0.2929 0.2887 0.2846 KFILTER_SDSS 7930 0.4374 0.2935 0.2901 0.2869 0.2837 KFILTER_SDSS 7980 0.4325 0.2937 0.2917 0.2897 0.2877 KFILTER_SDSS 8030 0.4251 0.2902 0.2888 0.2874 0.2861 KFILTER_SDSS 8080 0.4122 0.2772 0.2747 0.2723 0.2699 KFILTER_SDSS 8130 0.3850 0.2476 0.2421 0.2368 0.2316 KFILTER_SDSS 8180 0.2803 0.1735 0.1677 0.1621 0.1567 KFILTER_SDSS 8230 0.1491 0.0915 0.0882 0.0850 0.0819 KFILTER_SDSS 8280 0.0597 0.0375 0.0364 0.0353 0.0342 KFILTER_SDSS 8330 0.0174 0.0115 0.0113 0.0111 0.0109 KFILTER_SDSS 8380 0.0072 0.0049 0.0048 0.0047 0.0047 KFILTER_SDSS 8430 0.0029 0.0020 0.0019 0.0019 0.0019 KFILTER_SDSS 8480 0.0014 0.0010 0.0009 0.0009 0.0009 KFILTER_SDSS 8530 0.0014 0.0009 0.0009 0.0009 0.0009 KFILTER_SDSS 8580 0.0008 0.0005 0.0005 0.0005 0.0005 KFILTER_SDSS 8630 0.0000 0.0000 0.0000 0.0000 0.0000