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Photometric Keywords and Zeropoints

Photometric Keywords and Vegamag Zeropoints for 77.1K Detectors

(Appropriate for all data taken after January 1, 2000)

Last update February 2007.

The three tables below show NICMOS Photometric Keywords derived from principle calibration stars P330E and G191B2B for the three different cameras. The calibration values are the weighted averages of the values derived for the two stars individually. The relative error (sigma/mean) reflects the uncertainty in PHOTFLAM and PHOTFNU due to the individual star measurement errors and the discrepancy between the two stars. This error does not include the uncertainty in the absolute calibration of the reference star spectra, which are believed to be less than 5%. This reference spectrum uncertainty will also introduce a much smaller error in colors derived from NICMOS observations in different passbands, which are thought to be less than 3%, especially for the broad and medium band filters. The calibrations have been measured using apertures with a 11.5 pixel radius for NIC1,a 6.5 pixel radius for NIC2, and a 5.5 pixel radius for NIC3. They were then corrected to total flux with the listed passband dependent aperture corrections derived from TinyTim simulations. The fractional error values listed below are fractions of 1.0 (multiply this value by 100 to get the error in percent).

NIC1
FILTER PHOTFLAM PHOTFLAMERR PHOTPLAM PHOTBW PHOTZPT PHOTFNU PHOTFNUERR <F_NU(VEGA)> APCORR
erg*cm-2Å-1*DN-1 fractional error Å Å mag Jy*sec*DN-1 fractional error Jy
F090M 2.83996e-18 0.0023 9034.6 559.6 -21.10 7.73230e-06 0.0023 2266.0 1.1103
F095N 4.41118e-17 0.0072 9536.8 37.6 -21.10 1.33825e-04 0.0072 2046.4 1.1157
F097N 3.49435e-17 0.0126 9715.8 44.2 -21.10 1.10028e-04 0.0126 2275.3 1.1183
F108N 2.40623e-17 0.0029 10816.3 38.5 -21.10 9.39014e-05 0.0029 1937.0 1.1282
F110M 1.04362e-18 0.0051 11017.9 590.1 -21.10 4.22595e-06 0.0051 1884.3 1.1331
F110W 3.41897e-19 0.0109 11233.6 1651.7 -21.10 1.43917e-06 0.0109 1855.8 1.1369
F113N 1.79912e-17 0.0050 11298.3 47.0 -21.10 7.66068e-05 0.0050 1820.9 1.1359
F140W 1.30265e-19 0.0258 14268.5 2365.0 -21.10 8.84631e-07 0.0258 1373.3 1.1665
F145M 5.23596e-19 0.0106 14548.3 587.7 -21.10 3.69657e-06 0.0106 1247.2 1.1786
F160W 1.96285e-19 0.0070 16036.9 1168.8 -21.10 1.68386e-06 0.0070 1086.0 1.1854
F164N 4.17935e-18 0.0072 16460.3 60.2 -21.10 3.77714e-05 0.0072 1003.0 1.1878
F165M 3.64204e-19 0.0081 16480.3 593.1 -21.10 3.29954e-06 0.0081 1026.8 1.1881
F166N 4.13769e-18 0.0076 16606.7 61.8 -21.10 3.80629e-05 0.0076 1047.6 1.1882
F170M 3.26872e-19 0.0032 17057.9 598.9 -21.10 3.17253e-06 0.0032 981.8 1.1899
F187N 3.07746e-18 0.0095 18747.7 67.1 -21.10 3.60799e-05 0.0095 803.9 1.1983
F190N 2.96578e-18 0.0048 18985.9 72.0 -21.10 3.56599e-05 0.0048 836.4 1.2003
POL0S 1.12271e-18 * 10564.6 1314.9 -21.10 4.20978e-06 * 1220.3 *
POL120S 1.10932e-18 * 10564.6 1314.9 -21.10 4.15954e-06 * 1220.3 *
POL240S 1.10962e-18 * 10564.6 1314.9 -21.10 4.16067e-06 * 1220.3 *
NIC2
FILTER PHOTFLAM PHOTFLAMERR PHOTPLAM PHOTBW PHOTZPT PHOTFNU PHOTFNUERR <F_NU(VEGA)> APCORR
erg*cm-2Å-1*DN-1 fractional error Å Å mag Jy*sec*DN-1 fractional error Jy
F110W 2.87684e-19 0.0086 11234.7 1630.0 -21.10 1.21121e-06 0.0086 1857.7 1.1436
F160W 1.74510e-19 0.0145 16030.4 1176.6 -21.10 1.49585e-06 0.0145 1086.9 1.1931
F165M 3.26164e-19 0.0056 16508.6 592.4 -21.10 2.96506e-06 0.0056 1023.9 1.1962
F171M 7.78327e-19 0.0043 17211.0 248.0 -21.10 7.69049e-06 0.0043 966.3 1.1984
F180M 7.48743e-19 0.0019 17969.8 239.2 -21.10 8.06491e-06 0.0019 904.1 1.2041
F187N 2.75990e-18 0.0060 18739.8 67.5 -21.10 3.23299e-05 0.0060 805.3 1.2080
F187W 2.42932e-19 0.0029 18705.6 723.3 -21.10 2.83537e-06 0.0029 848.7 1.2084
F190N 2.70977e-18 0.0026 19003.4 62.6 -21.10 3.26417e-05 0.0026 835.6 1.2100
F204M 4.22385e-19 0.0027 20351.9 339.2 -21.10 5.83577e-06 0.0027 744.3 1.2222
F205W 6.82316e-20 0.0044 20636.1 1831.9 -21.10 9.69214e-07 0.0044 736.0 1.2200
F207M 2.97740e-19 0.0023 20819.2 453.8 -21.10 4.30472e-06 0.0023 714.1 1.2247
F212N 1.91264e-18 0.0032 21212.8 87.4 -21.10 2.87084e-05 0.0032 691.0 1.2281
F215N 2.05102e-18 0.0031 21487.2 79.2 -21.10 3.15869e-05 0.0031 670.5 1.2291
F216N 1.87030e-18 0.0066 21640.9 79.4 -21.10 2.92174e-05 0.0066 631.1 1.2300
F222M 2.60257e-19 0.0106 22175.2 511.5 -21.10 4.26889e-06 0.0106 635.1 1.2326
F237M 2.05415e-19 0.0036 23690.5 473.0 -21.10 3.84555e-06 0.0036 570.9 1.2402
POL0L 4.48926e-19 * 19998.0 632.8 -21.10 5.99425e-06 * 459.8 *
POL120L 4.43252e-19 * 19998.0 632.8 -21.10 5.91848e-06 * 459.8 *
POL240L 4.42502e-19 * 19998.0 632.8 -21.10 5.90846e-06 * 459.8 *

NIC3
FILTER PHOTFLAM PHOTFLAMERR PHOTPLAM PHOTBW PHOTZPT PHOTFNU PHOTFNUERR <F_NU(VEGA)> APCORR
erg*cm-2-1*DN-1 fractional error Å Å mag Jy*sec*DN-1 fractional error Jy
F108N 2.67786e-17 0.0375 10799.5 47.3 -21.10 1.04177e-04 0.0375 1945.7 1.0549
F110W 3.79343e-19 0.0191 11200.5 1680.6 -21.10 1.58739e-06 0.0191 1863.4 1.0562
F113N 2.05770e-17 0.0333 11283.8 44.8 -21.10 8.73915e-05 0.0333 1824.9 1.0577
F150W 1.25195e-19 0.0380 15349.8 2341.3 -21.10 9.83954e-07 0.0380 1218.5 1.0806
F160W 2.24624e-19 0.0109 16041.6 1171.5 -21.10 1.92811e-06 0.0109 1085.7 1.0873
F164N 4.67607e-18 0.0308 16460.3 60.1 -21.10 4.22606e-05 0.0308 1003.1 1.0899
F166N 5.00302e-18 0.0279 16582.8 59.1 -21.10 4.58912e-05 0.0279 1048.9 1.0904
F175W 6.45296e-20 0.0152 18090.6 3217.6 -21.10 7.04438e-07 0.0152 967.9 1.0938
F187N 3.68375e-18 0.0168 18747.8 67.2 -21.10 4.31886e-05 0.0168 803.8 1.1010
F190N 3.35834e-18 0.0051 19003.4 62.7 -21.10 4.04544e-05 0.0051 835.6 1.1021
F196N 2.93744e-18 0.0136 19639.0 74.9 -21.10 3.77908e-05 0.0136 786.6 1.1044
F200N 2.76189e-18 0.0057 19974.8 83.8 -21.10 3.67578e-05 0.0057 768.4 1.1056
F212N 2.43119e-18 0.0049 21213.0 87.7 -21.10 3.64923e-05 0.0049 690.9 1.1120
F215N 2.58011e-18 0.0049 21487.2 79.2 -21.10 3.97356e-05 0.0049 670.6 1.1136
F222M 3.23563e-19 0.0071 22175.5 510.8 -21.10 5.30743e-06 0.0071 635.1 1.1187
F240M 1.97316e-19 0.0098 23957.4 587.4 -21.10 3.77765e-06 0.0098 559.9 1.1328
G096 8.37188e-19 * 10188.6 1075.4 -21.10 2.83609e-06 * 1308.2 *
G141 1.59073e-19 * 15393.1 2228.5 -21.10 1.27927e-06 * 853.7 *
G206 6.30066e-20 * 20842.0 2763.5 -21.10 8.64903e-07 * 652.2 *