# 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 2 # # 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 0.0007 0.0007 0.0007 KFILTER_SDSS 6680 0.0035 0.0025 0.0025 0.0024 0.0024 KFILTER_SDSS 6730 0.0103 0.0073 0.0071 0.0070 0.0069 KFILTER_SDSS 6780 0.0357 0.0255 0.0251 0.0247 0.0243 KFILTER_SDSS 6830 0.0984 0.0690 0.0676 0.0662 0.0648 KFILTER_SDSS 6880 0.2075 0.1380 0.1331 0.1284 0.1238 KFILTER_SDSS 6930 0.3323 0.2260 0.2196 0.2133 0.2072 KFILTER_SDSS 6980 0.4379 0.3093 0.3041 0.2989 0.2939 KFILTER_SDSS 7030 0.5131 0.3661 0.3612 0.3563 0.3515 KFILTER_SDSS 7080 0.5557 0.4064 0.4041 0.4019 0.3997 KFILTER_SDSS 7130 0.5756 0.4116 0.4069 0.4022 0.3976 KFILTER_SDSS 7180 0.5840 0.3832 0.3694 0.3561 0.3433 KFILTER_SDSS 7230 0.5832 0.3958 0.3857 0.3759 0.3664 KFILTER_SDSS 7280 0.5745 0.3876 0.3775 0.3676 0.3579 KFILTER_SDSS 7330 0.5618 0.3896 0.3829 0.3763 0.3698 KFILTER_SDSS 7380 0.5495 0.3823 0.3764 0.3707 0.3650 KFILTER_SDSS 7430 0.5392 0.3751 0.3698 0.3646 0.3594 KFILTER_SDSS 7480 0.5312 0.3671 0.3617 0.3563 0.3510 KFILTER_SDSS 7530 0.5228 0.3561 0.3497 0.3435 0.3374 KFILTER_SDSS 7580 0.5114 0.3471 0.3411 0.3351 0.3293 KFILTER_SDSS 7630 0.4974 0.2333 0.2054 0.1809 0.1594 KFILTER_SDSS 7680 0.4825 0.3277 0.3230 0.3184 0.3138 KFILTER_SDSS 7730 0.4683 0.3179 0.3138 0.3097 0.3057 KFILTER_SDSS 7780 0.4562 0.3079 0.3038 0.2998 0.2959 KFILTER_SDSS 7830 0.4453 0.2981 0.2939 0.2897 0.2856 KFILTER_SDSS 7880 0.4351 0.2901 0.2860 0.2819 0.2779 KFILTER_SDSS 7930 0.4274 0.2868 0.2835 0.2803 0.2772 KFILTER_SDSS 7980 0.4229 0.2872 0.2852 0.2833 0.2814 KFILTER_SDSS 8030 0.4161 0.2840 0.2827 0.2813 0.2800 KFILTER_SDSS 8080 0.4034 0.2712 0.2688 0.2664 0.2641 KFILTER_SDSS 8130 0.3738 0.2404 0.2351 0.2300 0.2249 KFILTER_SDSS 8180 0.2679 0.1658 0.1603 0.1549 0.1498 KFILTER_SDSS 8230 0.1385 0.0850 0.0819 0.0789 0.0761 KFILTER_SDSS 8280 0.0540 0.0339 0.0329 0.0319 0.0310 KFILTER_SDSS 8330 0.0159 0.0105 0.0104 0.0102 0.0101 KFILTER_SDSS 8380 0.0065 0.0044 0.0043 0.0043 0.0042 KFILTER_SDSS 8430 0.0028 0.0019 0.0018 0.0018 0.0018 KFILTER_SDSS 8480 0.0015 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