# 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): g # # 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 3630 0.0000 0.0000 0.0000 0.0000 0.0000 KFILTER_SDSS 3680 0.0017 0.0009 0.0008 0.0007 0.0006 KFILTER_SDSS 3730 0.0040 0.0020 0.0018 0.0016 0.0014 KFILTER_SDSS 3780 0.0072 0.0037 0.0033 0.0030 0.0027 KFILTER_SDSS 3830 0.0212 0.0113 0.0101 0.0091 0.0081 KFILTER_SDSS 3880 0.0653 0.0354 0.0320 0.0288 0.0260 KFILTER_SDSS 3930 0.1336 0.0741 0.0673 0.0611 0.0554 KFILTER_SDSS 3980 0.2122 0.1205 0.1101 0.1005 0.0918 KFILTER_SDSS 4030 0.2849 0.1649 0.1515 0.1391 0.1278 KFILTER_SDSS 4080 0.3387 0.1991 0.1837 0.1694 0.1562 KFILTER_SDSS 4130 0.3760 0.2240 0.2073 0.1919 0.1776 KFILTER_SDSS 4180 0.4022 0.2427 0.2254 0.2093 0.1944 KFILTER_SDSS 4230 0.4217 0.2574 0.2398 0.2234 0.2082 KFILTER_SDSS 4280 0.4378 0.2701 0.2524 0.2359 0.2204 KFILTER_SDSS 4330 0.4518 0.2816 0.2639 0.2473 0.2317 KFILTER_SDSS 4380 0.4645 0.2922 0.2746 0.2580 0.2425 KFILTER_SDSS 4430 0.4748 0.3015 0.2840 0.2676 0.2521 KFILTER_SDSS 4480 0.4822 0.3089 0.2918 0.2756 0.2603 KFILTER_SDSS 4530 0.4893 0.3161 0.2992 0.2833 0.2682 KFILTER_SDSS 4580 0.4984 0.3244 0.3078 0.2921 0.2772 KFILTER_SDSS 4630 0.5070 0.3323 0.3159 0.3004 0.2856 KFILTER_SDSS 4680 0.5124 0.3378 0.3218 0.3065 0.2920 KFILTER_SDSS 4730 0.5156 0.3416 0.3259 0.3109 0.2966 KFILTER_SDSS 4780 0.5184 0.3449 0.3295 0.3147 0.3006 KFILTER_SDSS 4830 0.5216 0.3486 0.3334 0.3189 0.3050 KFILTER_SDSS 4880 0.5257 0.3528 0.3380 0.3237 0.3100 KFILTER_SDSS 4930 0.5304 0.3573 0.3426 0.3286 0.3151 KFILTER_SDSS 4980 0.5355 0.3616 0.3471 0.3331 0.3197 KFILTER_SDSS 5030 0.5399 0.3654 0.3509 0.3370 0.3237 KFILTER_SDSS 5080 0.5427 0.3679 0.3536 0.3398 0.3265 KFILTER_SDSS 5130 0.5415 0.3677 0.3535 0.3399 0.3268 KFILTER_SDSS 5180 0.5360 0.3646 0.3508 0.3375 0.3247 KFILTER_SDSS 5230 0.5155 0.3513 0.3382 0.3256 0.3135 KFILTER_SDSS 5280 0.4180 0.2855 0.2751 0.2650 0.2553 KFILTER_SDSS 5330 0.2732 0.1870 0.1802 0.1738 0.1675 KFILTER_SDSS 5380 0.1350 0.0926 0.0893 0.0861 0.0831 KFILTER_SDSS 5430 0.0436 0.0300 0.0289 0.0279 0.0269 KFILTER_SDSS 5480 0.0165 0.0114 0.0110 0.0106 0.0102 KFILTER_SDSS 5530 0.0074 0.0051 0.0049 0.0047 0.0046 KFILTER_SDSS 5580 0.0031 0.0022 0.0021 0.0020 0.0019 KFILTER_SDSS 5630 0.0018 0.0013 0.0012 0.0012 0.0011 KFILTER_SDSS 5680 0.0013 0.0009 0.0009 0.0009 0.0008 KFILTER_SDSS 5730 0.0009 0.0006 0.0006 0.0006 0.0006 KFILTER_SDSS 5780 0.0004 0.0003 0.0003 0.0003 0.0003 KFILTER_SDSS 5830 0.0000 0.0000 0.0000 0.0000 0.0000