# 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 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 2980 0.0000 0.0000 0.0000 0.0000 0.0000 KFILTER_SDSS 3005 0.0018 0.0001 0.0001 0.0000 0.0000 KFILTER_SDSS 3030 0.0087 0.0008 0.0005 0.0002 0.0001 KFILTER_SDSS 3055 0.0156 0.0019 0.0011 0.0007 0.0004 KFILTER_SDSS 3080 0.0244 0.0037 0.0023 0.0014 0.0009 KFILTER_SDSS 3105 0.0388 0.0070 0.0046 0.0030 0.0020 KFILTER_SDSS 3130 0.0575 0.0121 0.0083 0.0057 0.0039 KFILTER_SDSS 3155 0.0781 0.0199 0.0144 0.0105 0.0076 KFILTER_SDSS 3180 0.0986 0.0286 0.0216 0.0163 0.0123 KFILTER_SDSS 3205 0.1177 0.0375 0.0291 0.0226 0.0175 KFILTER_SDSS 3230 0.1360 0.0462 0.0366 0.0290 0.0229 KFILTER_SDSS 3255 0.1539 0.0551 0.0443 0.0356 0.0286 KFILTER_SDSS 3280 0.1697 0.0632 0.0514 0.0417 0.0339 KFILTER_SDSS 3305 0.1818 0.0703 0.0577 0.0474 0.0389 KFILTER_SDSS 3330 0.1914 0.0764 0.0634 0.0525 0.0435 KFILTER_SDSS 3355 0.2002 0.0821 0.0686 0.0573 0.0478 KFILTER_SDSS 3380 0.2077 0.0868 0.0729 0.0612 0.0514 KFILTER_SDSS 3405 0.2138 0.0908 0.0766 0.0646 0.0545 KFILTER_SDSS 3430 0.2186 0.0939 0.0794 0.0672 0.0569 KFILTER_SDSS 3455 0.2224 0.0971 0.0825 0.0701 0.0595 KFILTER_SDSS 3480 0.2255 0.1010 0.0865 0.0741 0.0634 KFILTER_SDSS 3505 0.2280 0.1049 0.0905 0.0781 0.0674 KFILTER_SDSS 3530 0.2297 0.1077 0.0934 0.0810 0.0703 KFILTER_SDSS 3555 0.2303 0.1095 0.0953 0.0829 0.0722 KFILTER_SDSS 3580 0.2301 0.1105 0.0964 0.0841 0.0734 KFILTER_SDSS 3605 0.2292 0.1111 0.0972 0.0851 0.0744 KFILTER_SDSS 3630 0.2274 0.1116 0.0979 0.0860 0.0755 KFILTER_SDSS 3655 0.2244 0.1116 0.0983 0.0866 0.0763 KFILTER_SDSS 3680 0.2191 0.1103 0.0975 0.0862 0.0762 KFILTER_SDSS 3705 0.2105 0.1073 0.0951 0.0844 0.0748 KFILTER_SDSS 3730 0.1993 0.1025 0.0912 0.0811 0.0721 KFILTER_SDSS 3755 0.1861 0.0966 0.0861 0.0767 0.0684 KFILTER_SDSS 3780 0.1702 0.0890 0.0795 0.0710 0.0634 KFILTER_SDSS 3805 0.1510 0.0796 0.0713 0.0638 0.0571 KFILTER_SDSS 3830 0.1291 0.0687 0.0616 0.0553 0.0496 KFILTER_SDSS 3855 0.1053 0.0565 0.0509 0.0457 0.0411 KFILTER_SDSS 3880 0.0791 0.0429 0.0387 0.0349 0.0315 KFILTER_SDSS 3905 0.0512 0.0281 0.0254 0.0230 0.0208 KFILTER_SDSS 3930 0.0278 0.0154 0.0140 0.0127 0.0115 KFILTER_SDSS 3955 0.0144 0.0081 0.0074 0.0067 0.0061 KFILTER_SDSS 3980 0.0080 0.0045 0.0042 0.0038 0.0035 KFILTER_SDSS 4005 0.0042 0.0024 0.0022 0.0020 0.0018 KFILTER_SDSS 4030 0.0019 0.0011 0.0010 0.0009 0.0009 KFILTER_SDSS 4055 0.0010 0.0006 0.0005 0.0005 0.0005 KFILTER_SDSS 4080 0.0007 0.0004 0.0004 0.0004 0.0003 KFILTER_SDSS 4105 0.0003 0.0002 0.0002 0.0002 0.0002 KFILTER_SDSS 4130 0.0000 0.0000 0.0000 0.0000 0.0000