# 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): u # # Instrument: SDSS telescope at APO Column 5 # # 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 2980 0.0000 0.0000 0.0000 0.0000 0.0000 KFILTER_SDSS 3005 0.0016 0.0001 0.0001 0.0000 0.0000 KFILTER_SDSS 3030 0.0078 0.0007 0.0004 0.0002 0.0001 KFILTER_SDSS 3055 0.0140 0.0017 0.0010 0.0006 0.0003 KFILTER_SDSS 3080 0.0221 0.0034 0.0021 0.0013 0.0008 KFILTER_SDSS 3105 0.0356 0.0065 0.0042 0.0028 0.0018 KFILTER_SDSS 3130 0.0521 0.0110 0.0076 0.0052 0.0036 KFILTER_SDSS 3155 0.0690 0.0175 0.0127 0.0093 0.0067 KFILTER_SDSS 3180 0.0858 0.0249 0.0188 0.0142 0.0107 KFILTER_SDSS 3205 0.1028 0.0328 0.0254 0.0197 0.0153 KFILTER_SDSS 3230 0.1189 0.0405 0.0320 0.0253 0.0200 KFILTER_SDSS 3255 0.1331 0.0477 0.0383 0.0308 0.0247 KFILTER_SDSS 3280 0.1457 0.0543 0.0441 0.0358 0.0291 KFILTER_SDSS 3305 0.1570 0.0607 0.0499 0.0410 0.0336 KFILTER_SDSS 3330 0.1667 0.0665 0.0552 0.0457 0.0379 KFILTER_SDSS 3355 0.1742 0.0715 0.0597 0.0498 0.0416 KFILTER_SDSS 3380 0.1809 0.0756 0.0635 0.0533 0.0447 KFILTER_SDSS 3405 0.1877 0.0798 0.0673 0.0567 0.0479 KFILTER_SDSS 3430 0.1935 0.0831 0.0703 0.0595 0.0503 KFILTER_SDSS 3455 0.1972 0.0861 0.0731 0.0621 0.0528 KFILTER_SDSS 3480 0.1996 0.0894 0.0766 0.0656 0.0561 KFILTER_SDSS 3505 0.2019 0.0929 0.0802 0.0692 0.0597 KFILTER_SDSS 3530 0.2036 0.0955 0.0828 0.0718 0.0623 KFILTER_SDSS 3555 0.2042 0.0970 0.0844 0.0735 0.0640 KFILTER_SDSS 3580 0.2037 0.0978 0.0853 0.0745 0.0650 KFILTER_SDSS 3605 0.2026 0.0982 0.0859 0.0752 0.0658 KFILTER_SDSS 3630 0.2007 0.0985 0.0865 0.0759 0.0666 KFILTER_SDSS 3655 0.1978 0.0983 0.0866 0.0763 0.0672 KFILTER_SDSS 3680 0.1928 0.0971 0.0858 0.0759 0.0671 KFILTER_SDSS 3705 0.1848 0.0941 0.0835 0.0740 0.0657 KFILTER_SDSS 3730 0.1743 0.0897 0.0797 0.0709 0.0631 KFILTER_SDSS 3755 0.1621 0.0841 0.0750 0.0668 0.0595 KFILTER_SDSS 3780 0.1470 0.0769 0.0687 0.0614 0.0548 KFILTER_SDSS 3805 0.1284 0.0677 0.0606 0.0542 0.0485 KFILTER_SDSS 3830 0.1073 0.0571 0.0512 0.0459 0.0412 KFILTER_SDSS 3855 0.0852 0.0458 0.0412 0.0370 0.0333 KFILTER_SDSS 3880 0.0620 0.0336 0.0303 0.0274 0.0247 KFILTER_SDSS 3905 0.0381 0.0209 0.0189 0.0171 0.0155 KFILTER_SDSS 3930 0.0189 0.0105 0.0095 0.0086 0.0078 KFILTER_SDSS 3955 0.0088 0.0050 0.0045 0.0041 0.0037 KFILTER_SDSS 3980 0.0047 0.0027 0.0025 0.0023 0.0021 KFILTER_SDSS 4005 0.0024 0.0014 0.0013 0.0012 0.0011 KFILTER_SDSS 4030 0.0011 0.0006 0.0006 0.0005 0.0005 KFILTER_SDSS 4055 0.0006 0.0004 0.0003 0.0003 0.0003 KFILTER_SDSS 4080 0.0005 0.0003 0.0003 0.0003 0.0002 KFILTER_SDSS 4105 0.0003 0.0002 0.0001 0.0001 0.0001 KFILTER_SDSS 4130 0.0000 0.0000 0.0000 0.0000 0.0000