# 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 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 6430 0.0000 0.0000 0.0000 0.0000 0.0000 KFILTER_SDSS 6480 0.0003 0.0002 0.0002 0.0002 0.0002 KFILTER_SDSS 6530 0.0005 0.0004 0.0004 0.0004 0.0004 KFILTER_SDSS 6580 0.0006 0.0004 0.0004 0.0004 0.0004 KFILTER_SDSS 6630 0.0013 0.0009 0.0009 0.0009 0.0008 KFILTER_SDSS 6680 0.0038 0.0027 0.0026 0.0026 0.0025 KFILTER_SDSS 6730 0.0138 0.0098 0.0096 0.0094 0.0092 KFILTER_SDSS 6780 0.0463 0.0331 0.0326 0.0321 0.0316 KFILTER_SDSS 6830 0.1135 0.0796 0.0780 0.0764 0.0748 KFILTER_SDSS 6880 0.2185 0.1453 0.1401 0.1351 0.1303 KFILTER_SDSS 6930 0.3310 0.2252 0.2187 0.2125 0.2064 KFILTER_SDSS 6980 0.4194 0.2962 0.2912 0.2863 0.2814 KFILTER_SDSS 7030 0.4785 0.3414 0.3368 0.3323 0.3278 KFILTER_SDSS 7080 0.5112 0.3738 0.3718 0.3698 0.3678 KFILTER_SDSS 7130 0.5259 0.3761 0.3718 0.3675 0.3633 KFILTER_SDSS 7180 0.5309 0.3483 0.3358 0.3237 0.3121 KFILTER_SDSS 7230 0.5283 0.3585 0.3494 0.3406 0.3319 KFILTER_SDSS 7280 0.5197 0.3507 0.3415 0.3325 0.3238 KFILTER_SDSS 7330 0.5088 0.3528 0.3467 0.3407 0.3349 KFILTER_SDSS 7380 0.4993 0.3473 0.3420 0.3368 0.3317 KFILTER_SDSS 7430 0.4917 0.3421 0.3372 0.3325 0.3277 KFILTER_SDSS 7480 0.4856 0.3356 0.3306 0.3257 0.3208 KFILTER_SDSS 7530 0.4785 0.3259 0.3201 0.3143 0.3087 KFILTER_SDSS 7580 0.4684 0.3179 0.3124 0.3069 0.3016 KFILTER_SDSS 7630 0.4561 0.2139 0.1884 0.1659 0.1461 KFILTER_SDSS 7680 0.4432 0.3009 0.2966 0.2924 0.2882 KFILTER_SDSS 7730 0.4310 0.2926 0.2888 0.2850 0.2814 KFILTER_SDSS 7780 0.4206 0.2839 0.2802 0.2765 0.2728 KFILTER_SDSS 7830 0.4117 0.2756 0.2717 0.2678 0.2640 KFILTER_SDSS 7880 0.4037 0.2692 0.2654 0.2616 0.2579 KFILTER_SDSS 7930 0.3979 0.2670 0.2640 0.2610 0.2581 KFILTER_SDSS 7980 0.3945 0.2679 0.2660 0.2642 0.2624 KFILTER_SDSS 8030 0.3883 0.2650 0.2637 0.2625 0.2613 KFILTER_SDSS 8080 0.3764 0.2531 0.2509 0.2486 0.2464 KFILTER_SDSS 8130 0.3489 0.2244 0.2194 0.2146 0.2099 KFILTER_SDSS 8180 0.2495 0.1544 0.1493 0.1443 0.1395 KFILTER_SDSS 8230 0.1283 0.0787 0.0759 0.0731 0.0705 KFILTER_SDSS 8280 0.0499 0.0313 0.0304 0.0295 0.0286 KFILTER_SDSS 8330 0.0148 0.0098 0.0097 0.0095 0.0094 KFILTER_SDSS 8380 0.0060 0.0040 0.0040 0.0039 0.0039 KFILTER_SDSS 8430 0.0027 0.0018 0.0018 0.0018 0.0017 KFILTER_SDSS 8480 0.0015 0.0010 0.0010 0.0010 0.0010 KFILTER_SDSS 8530 0.0013 0.0009 0.0009 0.0009 0.0008 KFILTER_SDSS 8580 0.0007 0.0005 0.0005 0.0004 0.0004 KFILTER_SDSS 8630 0.0000 0.0000 0.0000 0.0000 0.0000