# 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 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 0.0003 0.0002 0.0002 0.0002 0.0002 KFILTER_SDSS 6530 0.0006 0.0004 0.0004 0.0004 0.0004 KFILTER_SDSS 6580 0.0007 0.0005 0.0005 0.0005 0.0005 KFILTER_SDSS 6630 0.0014 0.0010 0.0010 0.0010 0.0010 KFILTER_SDSS 6680 0.0046 0.0032 0.0032 0.0031 0.0030 KFILTER_SDSS 6730 0.0171 0.0121 0.0118 0.0116 0.0114 KFILTER_SDSS 6780 0.0553 0.0395 0.0389 0.0383 0.0377 KFILTER_SDSS 6830 0.1302 0.0914 0.0895 0.0877 0.0859 KFILTER_SDSS 6880 0.2428 0.1615 0.1557 0.1502 0.1448 KFILTER_SDSS 6930 0.3609 0.2455 0.2385 0.2317 0.2250 KFILTER_SDSS 6980 0.4514 0.3188 0.3134 0.3081 0.3029 KFILTER_SDSS 7030 0.5101 0.3639 0.3590 0.3542 0.3495 KFILTER_SDSS 7080 0.5413 0.3959 0.3937 0.3916 0.3894 KFILTER_SDSS 7130 0.5541 0.3962 0.3917 0.3872 0.3827 KFILTER_SDSS 7180 0.5570 0.3655 0.3523 0.3397 0.3275 KFILTER_SDSS 7230 0.5526 0.3750 0.3655 0.3562 0.3472 KFILTER_SDSS 7280 0.5425 0.3660 0.3564 0.3471 0.3380 KFILTER_SDSS 7330 0.5303 0.3677 0.3613 0.3551 0.3490 KFILTER_SDSS 7380 0.5193 0.3613 0.3558 0.3503 0.3450 KFILTER_SDSS 7430 0.5109 0.3554 0.3504 0.3454 0.3405 KFILTER_SDSS 7480 0.5049 0.3489 0.3437 0.3386 0.3336 KFILTER_SDSS 7530 0.4985 0.3395 0.3335 0.3275 0.3217 KFILTER_SDSS 7580 0.4890 0.3320 0.3262 0.3205 0.3149 KFILTER_SDSS 7630 0.4770 0.2237 0.1970 0.1735 0.1528 KFILTER_SDSS 7680 0.4638 0.3149 0.3104 0.3060 0.3016 KFILTER_SDSS 7730 0.4510 0.3062 0.3022 0.2983 0.2944 KFILTER_SDSS 7780 0.4402 0.2971 0.2932 0.2894 0.2856 KFILTER_SDSS 7830 0.4311 0.2885 0.2844 0.2804 0.2764 KFILTER_SDSS 7880 0.4230 0.2820 0.2780 0.2741 0.2702 KFILTER_SDSS 7930 0.4162 0.2793 0.2761 0.2730 0.2700 KFILTER_SDSS 7980 0.4105 0.2788 0.2769 0.2750 0.2731 KFILTER_SDSS 8030 0.4023 0.2746 0.2733 0.2720 0.2707 KFILTER_SDSS 8080 0.3899 0.2622 0.2599 0.2575 0.2553 KFILTER_SDSS 8130 0.3620 0.2328 0.2277 0.2227 0.2178 KFILTER_SDSS 8180 0.2635 0.1631 0.1577 0.1524 0.1473 KFILTER_SDSS 8230 0.1412 0.0867 0.0835 0.0805 0.0776 KFILTER_SDSS 8280 0.0571 0.0359 0.0348 0.0337 0.0327 KFILTER_SDSS 8330 0.0166 0.0110 0.0108 0.0107 0.0105 KFILTER_SDSS 8380 0.0068 0.0046 0.0045 0.0045 0.0044 KFILTER_SDSS 8430 0.0029 0.0020 0.0019 0.0019 0.0019 KFILTER_SDSS 8480 0.0015 0.0010 0.0010 0.0010 0.0010 KFILTER_SDSS 8530 0.0014 0.0010 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