# 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 Column 4 # # 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 0.0019 0.0013 0.0012 0.0012 0.0011 KFILTER_SDSS 5330 0.0012 0.0008 0.0008 0.0007 0.0007 KFILTER_SDSS 5380 -0.0025 -0.0017 -0.0016 -0.0016 -0.0015 KFILTER_SDSS 5430 0.0090 0.0062 0.0060 0.0058 0.0056 KFILTER_SDSS 5480 0.0552 0.0379 0.0366 0.0354 0.0342 KFILTER_SDSS 5530 0.1430 0.0983 0.0950 0.0917 0.0886 KFILTER_SDSS 5580 0.2679 0.1843 0.1781 0.1720 0.1662 KFILTER_SDSS 5630 0.3936 0.2710 0.2618 0.2529 0.2444 KFILTER_SDSS 5680 0.4848 0.3339 0.3226 0.3118 0.3013 KFILTER_SDSS 5730 0.5425 0.3738 0.3614 0.3493 0.3377 KFILTER_SDSS 5780 0.5766 0.3977 0.3846 0.3719 0.3597 KFILTER_SDSS 5830 0.5956 0.4115 0.3982 0.3853 0.3728 KFILTER_SDSS 5880 0.6070 0.4203 0.4070 0.3942 0.3817 KFILTER_SDSS 5930 0.6149 0.4271 0.4141 0.4014 0.3891 KFILTER_SDSS 5980 0.6217 0.4334 0.4207 0.4084 0.3965 KFILTER_SDSS 6030 0.6253 0.4379 0.4258 0.4140 0.4025 KFILTER_SDSS 6080 0.6242 0.4392 0.4277 0.4166 0.4057 KFILTER_SDSS 6130 0.6224 0.4397 0.4288 0.4183 0.4079 KFILTER_SDSS 6180 0.6244 0.4422 0.4318 0.4217 0.4118 KFILTER_SDSS 6230 0.6293 0.4465 0.4364 0.4266 0.4169 KFILTER_SDSS 6280 0.6352 0.4512 0.4413 0.4316 0.4222 KFILTER_SDSS 6330 0.6395 0.4546 0.4449 0.4355 0.4262 KFILTER_SDSS 6380 0.6405 0.4556 0.4462 0.4369 0.4279 KFILTER_SDSS 6430 0.6395 0.4551 0.4459 0.4369 0.4281 KFILTER_SDSS 6480 0.6377 0.4540 0.4452 0.4364 0.4279 KFILTER_SDSS 6530 0.6336 0.4514 0.4429 0.4345 0.4263 KFILTER_SDSS 6580 0.6269 0.4466 0.4384 0.4303 0.4224 KFILTER_SDSS 6630 0.6089 0.4325 0.4243 0.4163 0.4084 KFILTER_SDSS 6680 0.5242 0.3704 0.3630 0.3557 0.3486 KFILTER_SDSS 6730 0.3823 0.2703 0.2650 0.2599 0.2548 KFILTER_SDSS 6780 0.2184 0.1561 0.1537 0.1513 0.1490 KFILTER_SDSS 6830 0.0861 0.0604 0.0592 0.0580 0.0568 KFILTER_SDSS 6880 0.0268 0.0178 0.0172 0.0166 0.0160 KFILTER_SDSS 6930 0.0128 0.0087 0.0085 0.0082 0.0080 KFILTER_SDSS 6980 0.0072 0.0051 0.0050 0.0049 0.0048 KFILTER_SDSS 7030 0.0034 0.0024 0.0024 0.0023 0.0023 KFILTER_SDSS 7080 0.0018 0.0013 0.0013 0.0013 0.0013 KFILTER_SDSS 7130 0.0013 0.0009 0.0009 0.0009 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