# 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): r # # 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 5230 0.0000 0.0000 0.0000 0.0000 0.0000 KFILTER_SDSS 5280 0.0020 0.0014 0.0013 0.0013 0.0012 KFILTER_SDSS 5330 0.0013 0.0009 0.0009 0.0008 0.0008 KFILTER_SDSS 5380 -0.0019 -0.0013 -0.0013 -0.0012 -0.0012 KFILTER_SDSS 5430 0.0146 0.0100 0.0097 0.0093 0.0090 KFILTER_SDSS 5480 0.0733 0.0504 0.0487 0.0470 0.0454 KFILTER_SDSS 5530 0.1750 0.1203 0.1162 0.1122 0.1084 KFILTER_SDSS 5580 0.3085 0.2123 0.2050 0.1981 0.1913 KFILTER_SDSS 5630 0.4382 0.3016 0.2914 0.2816 0.2721 KFILTER_SDSS 5680 0.5312 0.3658 0.3535 0.3416 0.3301 KFILTER_SDSS 5730 0.5898 0.4064 0.3929 0.3798 0.3671 KFILTER_SDSS 5780 0.6246 0.4309 0.4167 0.4029 0.3897 KFILTER_SDSS 5830 0.6442 0.4451 0.4307 0.4167 0.4032 KFILTER_SDSS 5880 0.6559 0.4542 0.4398 0.4259 0.4125 KFILTER_SDSS 5930 0.6640 0.4612 0.4471 0.4334 0.4202 KFILTER_SDSS 5980 0.6711 0.4679 0.4542 0.4409 0.4280 KFILTER_SDSS 6030 0.6750 0.4727 0.4596 0.4469 0.4345 KFILTER_SDSS 6080 0.6740 0.4743 0.4619 0.4498 0.4381 KFILTER_SDSS 6130 0.6727 0.4751 0.4634 0.4520 0.4409 KFILTER_SDSS 6180 0.6754 0.4784 0.4671 0.4561 0.4454 KFILTER_SDSS 6230 0.6810 0.4832 0.4723 0.4616 0.4511 KFILTER_SDSS 6280 0.6869 0.4879 0.4772 0.4668 0.4565 KFILTER_SDSS 6330 0.6907 0.4910 0.4805 0.4703 0.4603 KFILTER_SDSS 6380 0.6910 0.4915 0.4813 0.4713 0.4616 KFILTER_SDSS 6430 0.6902 0.4911 0.4812 0.4715 0.4620 KFILTER_SDSS 6480 0.6900 0.4913 0.4816 0.4722 0.4630 KFILTER_SDSS 6530 0.6870 0.4895 0.4803 0.4712 0.4623 KFILTER_SDSS 6580 0.6798 0.4843 0.4754 0.4666 0.4580 KFILTER_SDSS 6630 0.6603 0.4690 0.4601 0.4514 0.4429 KFILTER_SDSS 6680 0.5673 0.4009 0.3929 0.3850 0.3773 KFILTER_SDSS 6730 0.4136 0.2923 0.2867 0.2811 0.2756 KFILTER_SDSS 6780 0.2388 0.1707 0.1681 0.1655 0.1629 KFILTER_SDSS 6830 0.0979 0.0687 0.0673 0.0659 0.0646 KFILTER_SDSS 6880 0.0324 0.0215 0.0208 0.0200 0.0193 KFILTER_SDSS 6930 0.0147 0.0100 0.0097 0.0095 0.0092 KFILTER_SDSS 6980 0.0078 0.0055 0.0054 0.0053 0.0052 KFILTER_SDSS 7030 0.0038 0.0027 0.0027 0.0026 0.0026 KFILTER_SDSS 7080 0.0021 0.0015 0.0015 0.0015 0.0015 KFILTER_SDSS 7130 0.0014 0.0010 0.0010 0.0010 0.0009 KFILTER_SDSS 7180 0.0006 0.0004 0.0004 0.0004 0.0004 KFILTER_SDSS 7230 0.0000 0.0000 0.0000 0.0000 0.0000