| HST/WFC3_UVIS2.F218W | 2221.48 | 2231.14 | 2218.83 | 1990.00 | 2612.14 | 322.32 | 780.90 | 4.74e-9 | HST | WFC3 | F218W filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ232N | 2327.04 | 2327.12 | 2326.85 | 2294.18 | 2362.03 | 31.38 | 776.49 | 4.3e-9 | HST | WFC3 | FQ232N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F225W | 2357.65 | 2377.24 | 2358.70 | 1990.00 | 2984.10 | 461.14 | 800.33 | 4.32e-9 | HST | WFC3 | F225W filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ243N | 2420.51 | 2420.59 | 2420.67 | 2388.36 | 2453.82 | 35.00 | 778.29 | 3.98e-9 | HST | WFC3 | FQ243N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F275W | 2702.92 | 2718.36 | 2713.86 | 2284.80 | 3123.57 | 415.50 | 924.40 | 3.79e-9 | HST | WFC3 | F275W filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F275W | Filter Description | Filter ID (?) : | HST/WFC3_UVIS2.F275W |
| Description (?) : | F275W filter for HST WFC3_UVIS2 |
| Phot.System (?) : | WFC3-UVIS2 |
| Detector Type (?) : | Photon counter |
| Band Name (?) : | ------ |
| Obs. Facility (?) : | HST |
| Instrument (?) : | WFC3 |
| Comments (?) : | Response calculated at a reference time, June 26, 2009, i.e. approximately when WFC3 was installed on HST. Using filter throughputs determined in the lab in combination with the measured QE of the flight detectors and sensitivities of WFC3's optics. These values were derived with STsynphot by using filter and correction files from the latest photometric calibration released on October 2020 (Bajaj et al 2020, Calamida et al. 2021). For more information on the latest photometric calibration please see the Photometric calibration webpage.
|
| | Mathematical properties | Property | Calculated | Specified | Unit | | λref (?) : |
2702.92 | ------- | (Angstrom) |
| λmean (?) : |
2718.36 | ------- | (Angstrom) |
| λcen (?) : |
2725.91 | ------- | (Angstrom) |
| λeff (?) : |
2713.86 | ------- | (Angstrom) |
| λpeak (?) : |
2590.77 | ------- | (Angstrom) |
| λpivot (?) : |
2702.92 | ------- | (Angstrom) |
| λphot (?) : |
2724.30 | ------- | (Angstrom) |
| λmin (?) : |
2284.80 | ------- | (Angstrom) |
| λmax (?) : |
3123.57 | ------- | (Angstrom) |
| Weff (?) : |
415.50 | ------- | (Angstrom) |
| FWHM (?) : |
471.42 | ------- | (Angstrom) |
| Af/AV (?) : |
2.03 | ------- | () |
| Fsun (?) : |
23.81 | ------- | (erg/cm2/s/A) |
| Transmission
Data file: ascii, VOTable Reference for filter response:
Wide Field Camera 3 Performance Transmission components: Filter + CCD + Instrumentid:HST/WFC3_UVIS2.F275W
You can download here the GaiaXPy base XML file for the full HST/WFC3_UVIS2 filter set.
Please, take a look to GaiaXPy documentation for more information. - GaiaXPy base XML file. | | Calibration properties
Vega System | Property | Specified | Calculated | Unit | | Zero Point (?) : |
------- |
3.79327e-9 | (erg/cm2/s/A) |
| |
------- |
924.40 | (Jy) |
| ZP Type (?) : |
Pogson |
| PhotCal ID (?) : |
HST/WFC3_UVIS2.F275W/Vega |
| |
AB System | Property | Specified | Calculated | Unit | | Zero Point (?) : |
------- |
1.48998e-8 | (erg/cm2/s/A) |
| |
------- |
3631.00 | (Jy) |
| ZP Type (?) : |
Pogson |
| PhotCal ID (?) : |
HST/WFC3_UVIS2.F275W/AB |
| |
ST System | Property | Specified | Calculated | Unit | | Zero Point (?) : |
------- |
3.631e-9 | (erg/cm2/s/A) |
| |
------- |
884.85 | (Jy) |
| ZP Type (?) : |
Pogson |
| PhotCal ID (?) : |
HST/WFC3_UVIS2.F275W/ST |
| |
|
Filter added: 2019-07-16 12:16:06
Last update: 2022-03-01 15:30:03 |
| HST/WFC3_UVIS2.F280N | 2796.87 | 2796.98 | 2796.94 | 2761.81 | 2840.94 | 40.26 | 920.12 | 3.53e-9 | HST | WFC3 | F280N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F300X | 2805.35 | 2867.82 | 2864.33 | 2148.40 | 4176.79 | 747.35 | 988.82 | 3.77e-9 | HST | WFC3 | F300X filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F336W | 3354.60 | 3365.86 | 3359.11 | 3015.92 | 3708.17 | 512.01 | 1241.97 | 3.31e-9 | HST | WFC3 | F336W filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F343N | 3435.20 | 3438.50 | 3436.52 | 3262.54 | 3644.52 | 257.05 | 1276.29 | 3.24e-9 | HST | WFC3 | F343N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F373N | 3730.09 | 3730.19 | 3731.35 | 3693.44 | 3770.53 | 49.47 | 1625.86 | 3.5e-9 | HST | WFC3 | F373N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ378N | 3792.39 | 3792.78 | 3797.02 | 3724.59 | 3871.99 | 98.47 | 2379.39 | 4.96e-9 | HST | WFC3 | FQ378N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ387N | 3873.56 | 3873.61 | 3871.30 | 3849.58 | 3897.86 | 33.63 | 3416.21 | 6.83e-9 | HST | WFC3 | FQ387N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F390M | 3896.99 | 3898.62 | 3904.88 | 3724.41 | 4052.14 | 204.14 | 3384.09 | 6.68e-9 | HST | WFC3 | F390M filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F390W | 3920.70 | 3952.50 | 4019.86 | 3258.78 | 4470.92 | 826.47 | 3011.05 | 5.87e-9 | HST | WFC3 | F390W filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F395N | 3955.13 | 3955.38 | 3952.64 | 3895.05 | 4018.38 | 85.38 | 3780.45 | 7.25e-9 | HST | WFC3 | F395N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F410M | 4108.70 | 4109.81 | 4108.63 | 3984.40 | 4237.98 | 169.72 | 4261.90 | 7.57e-9 | HST | WFC3 | F410M filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ422M | 4219.19 | 4219.70 | 4218.69 | 4114.99 | 4327.89 | 112.66 | 4589.74 | 7.73e-9 | HST | WFC3 | FQ422M filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F438W | 4325.15 | 4338.57 | 4322.26 | 3898.07 | 4710.44 | 592.81 | 4225.45 | 6.77e-9 | HST | WFC3 | F438W filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ436N | 4367.35 | 4367.41 | 4369.34 | 4334.24 | 4401.70 | 43.35 | 3793.57 | 5.96e-9 | HST | WFC3 | FQ436N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ437N | 4371.27 | 4371.30 | 4371.81 | 4348.50 | 4393.42 | 30.02 | 4078.11 | 6.4e-9 | HST | WFC3 | FQ437N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.G280 | 3651.87 | 4628.43 | 4144.79 | 2000.00 | 9500.00 | 3129.00 | 1698.27 | 3.82e-9 | HST | WFC3 | G280 grism for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F467M | 4682.22 | 4683.55 | 4680.90 | 4546.74 | 4830.80 | 200.29 | 4219.69 | 5.77e-9 | HST | WFC3 | F467M filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F469N | 4688.21 | 4688.29 | 4688.15 | 4653.86 | 4723.13 | 49.71 | 4232.72 | 5.77e-9 | HST | WFC3 | F469N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F475W | 4772.17 | 4827.71 | 4731.44 | 3944.89 | 5584.59 | 1266.99 | 4001.68 | 5.27e-9 | HST | WFC3 | F475W filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F487N | 4871.43 | 4871.54 | 4873.39 | 4827.64 | 4917.77 | 60.25 | 3078.84 | 3.89e-9 | HST | WFC3 | F487N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ492N | 4933.48 | 4933.83 | 4934.64 | 4859.29 | 5012.92 | 113.13 | 3874.09 | 4.77e-9 | HST | WFC3 | FQ492N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F502N | 5009.81 | 5009.93 | 5009.68 | 4963.34 | 5058.54 | 64.97 | 3954.65 | 4.72e-9 | HST | WFC3 | F502N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F475X | 4937.39 | 5076.23 | 4852.88 | 3741.88 | 6962.81 | 1979.79 | 3827.83 | 4.71e-9 | HST | WFC3 | F475X filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ508N | 5091.13 | 5091.59 | 5090.71 | 5003.28 | 5181.21 | 130.98 | 3899.03 | 4.51e-9 | HST | WFC3 | FQ508N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F555W | 5307.90 | 5388.55 | 5235.33 | 4382.81 | 7096.94 | 1589.63 | 3726.70 | 3.97e-9 | HST | WFC3 | F555W filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F547M | 5447.25 | 5459.04 | 5435.83 | 5040.50 | 5912.18 | 668.59 | 3641.86 | 3.68e-9 | HST | WFC3 | F547M filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ575N | 5756.91 | 5756.92 | 5756.89 | 5742.15 | 5771.15 | 18.35 | 3439.83 | 3.11e-9 | HST | WFC3 | FQ575N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F606W | 5887.70 | 5999.27 | 5780.81 | 4712.79 | 7208.05 | 2035.05 | 3363.36 | 2.91e-9 | HST | WFC3 | F606W filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F200LP | 4875.30 | 6043.00 | 5069.44 | 1990.00 | 10778.36 | 5218.02 | 2332.89 | 2.94e-9 | HST | WFC3 | F200LP filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ619N | 6198.39 | 6198.49 | 6198.28 | 6146.74 | 6253.36 | 60.95 | 3186.52 | 2.49e-9 | HST | WFC3 | FQ619N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F621M | 6219.19 | 6227.39 | 6209.11 | 5821.07 | 6619.29 | 595.77 | 3160.98 | 2.45e-9 | HST | WFC3 | F621M filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F625W | 6241.96 | 6291.29 | 6187.65 | 5417.23 | 7140.49 | 1435.69 | 3159.28 | 2.43e-9 | HST | WFC3 | F625W filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F631N | 6304.19 | 6304.27 | 6304.00 | 6263.86 | 6346.80 | 58.04 | 3128.50 | 2.36e-9 | HST | WFC3 | F631N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ634N | 6349.26 | 6349.37 | 6349.19 | 6294.10 | 6407.48 | 63.98 | 3085.67 | 2.29e-9 | HST | WFC3 | FQ634N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F645N | 6453.41 | 6453.59 | 6453.16 | 6383.19 | 6521.54 | 84.36 | 3032.31 | 2.18e-9 | HST | WFC3 | F645N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F350LP | 5851.18 | 6508.00 | 5531.10 | 3209.73 | 10776.10 | 4546.44 | 3146.71 | 2.76e-9 | HST | WFC3 | F350LP filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F656N | 6561.53 | 6561.54 | 6561.33 | 6548.77 | 6574.27 | 17.65 | 2124.61 | 1.48e-9 | HST | WFC3 | F656N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F657N | 6566.58 | 6566.93 | 6566.46 | 6476.02 | 6674.14 | 121.20 | 2688.82 | 1.87e-9 | HST | WFC3 | F657N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F658N | 6585.62 | 6585.64 | 6586.18 | 6566.93 | 6604.64 | 27.52 | 2618.12 | 1.81e-9 | HST | WFC3 | F658N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F665N | 6655.86 | 6656.23 | 6656.33 | 6552.77 | 6755.91 | 131.83 | 2900.60 | 1.96e-9 | HST | WFC3 | F665N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ672N | 6717.12 | 6717.13 | 6717.11 | 6702.24 | 6731.72 | 19.37 | 2920.95 | 1.94e-9 | HST | WFC3 | FQ672N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ674N | 6730.58 | 6730.58 | 6730.57 | 6716.75 | 6744.20 | 17.62 | 2913.92 | 1.93e-9 | HST | WFC3 | FQ674N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F673N | 6765.97 | 6766.27 | 6765.65 | 6681.23 | 6860.30 | 117.86 | 2896.49 | 1.9e-9 | HST | WFC3 | F673N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F680N | 6877.42 | 6880.13 | 6874.60 | 6631.33 | 7145.86 | 370.40 | 2848.30 | 1.81e-9 | HST | WFC3 | F680N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F689M | 6876.50 | 6885.92 | 6871.95 | 6451.21 | 7326.83 | 693.76 | 2798.56 | 1.77e-9 | HST | WFC3 | F689M filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ727N | 7275.75 | 7275.84 | 7275.63 | 7216.95 | 7336.29 | 63.89 | 2670.70 | 1.51e-9 | HST | WFC3 | FQ727N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ750N | 7502.44 | 7502.54 | 7502.31 | 7436.57 | 7570.57 | 70.43 | 2578.86 | 1.37e-9 | HST | WFC3 | FQ750N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F763M | 7612.76 | 7623.09 | 7601.29 | 7165.15 | 8092.22 | 731.73 | 2537.30 | 1.31e-9 | HST | WFC3 | F763M filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F600LP | 7453.67 | 7656.67 | 7279.55 | 5928.45 | 10783.52 | 2671.23 | 2674.60 | 1.44e-9 | HST | WFC3 | F600LP filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F775W | 7648.31 | 7683.41 | 7609.97 | 6870.74 | 8575.73 | 1253.37 | 2532.92 | 1.3e-9 | HST | WFC3 | F775W filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F814W | 8029.30 | 8117.36 | 7954.84 | 6978.74 | 9694.01 | 1748.47 | 2448.62 | 1.14e-9 | HST | WFC3 | F814W filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F845M | 8437.30 | 8449.34 | 8428.43 | 7895.87 | 9018.73 | 821.05 | 2277.16 | 9.59e-10 | HST | WFC3 | F845M filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ889N | 8892.27 | 8892.56 | 8894.12 | 8706.82 | 9030.90 | 98.51 | 2246.74 | 8.52e-10 | HST | WFC3 | FQ889N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ906N | 9057.90 | 9058.19 | 9059.59 | 8870.92 | 9159.61 | 98.49 | 2249.04 | 8.22e-10 | HST | WFC3 | FQ906N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F850LP | 9169.95 | 9207.49 | 9148.57 | 8253.80 | 10971.11 | 1235.82 | 2228.42 | 7.94e-10 | HST | WFC3 | F850LP filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ924N | 9247.72 | 9247.91 | 9249.04 | 9146.28 | 9336.10 | 91.58 | 2097.74 | 7.35e-10 | HST | WFC3 | FQ924N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.FQ937N | 9372.66 | 9372.90 | 9372.50 | 9262.19 | 9486.78 | 93.60 | 2332.02 | 7.96e-10 | HST | WFC3 | FQ937N filter for HST WFC3_UVIS2 |
| HST/WFC3_UVIS2.F953N | 9530.79 | 9531.11 | 9528.95 | 9321.74 | 9722.63 | 96.76 | 2045.39 | 6.75e-10 | HST | WFC3 | F953N filter for HST WFC3_UVIS2 |
 ≡ filter transmission<p><u>Property info:</u><ul><li><b>Unit</b>:Angstrom<li><b>UCD</b>:em.wl</ul></td></table>',WIDTH,400)){kind=link}
 ≡ filter transmission<br> Vg(λ) ≡ Vega spectrum.<p><u>More info:</u><p>Vega spectrum from calspec database.<ul><li><a href="https://ui.adsabs.harvard.edu/abs/2014PASP..126..711B/abstract" target="_blank">Bohlin, Gordon, & Tremblay (2014)</a>.<li><a href="https://www.stsci.edu/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/calspec" target="_blank">STScI current calspec</a>.<li><a href="morefiles/vega.dat" target="_blank">Vega spectrum file</a> (units: Angstrom erg/cm2/s/A).</ul><p><u>Property info:</u><ul><li><b>Unit</b>:Angstrom<li><b>UCD</b>:em.wl.effective</ul></td></table>',WIDTH,400)){kind=link}
 ≡ filter transmission<p>Equivalent to the horizontal size of a rectangle with height equal to maximum transmission and with the same area that the one covered by the filter transmission curve.<p><u>Property info:</u><ul><li><b>Unit</b>:Angstrom<li><b>UCD</b>:instr.bandwidth<li><b>Utype</b>: <i>photdm:PhotometryFilter.bandwidth.extent.value</i></ul></td></table>',WIDTH,400)){kind=link}
 ≡ filter transmission (energy counter).<br> Vg(λ) ≡ Vega spectrum.<p><i>(T(λ) must be multiplied by λ for photon counting devices)</i><p>F<sub>0,ν</sub>(Jy) = (2.9979246)<sup>-1</sup> 10<sup>5</sup> * λ<sub>ref</sub><sup>2</sup> * F<sub>0,λ</sub>(erg/cm<sup>2</sup>/s/A)<p>In the case that filter owner specifies its own values, they will be the ones provided by the service when queried through the VO.<p><u>Property info:</u><ul><li><b>Unit</b>:Jy<li><b>UCD</b>:phot.flux.density<li><b>Utype</b>: <i>photdm:PhotCal.zeroPoint.flux.value</i></ul></td></table>',WIDTH,400)){kind=link}
 ≡ filter transmission (energy counter).<br> Vg(λ) ≡ Vega spectrum.<p><i>(T(λ) must be multiplied by λ for photon counting devices)</i><p><u>Property info:</u><ul><li><b>Unit</b>:erg/cm2/s/A<li><b>Utype</b>: <i>PhotCal.ZeroPoint</i></ul></td></table>',WIDTH,400)){kind=link}
 ≡ filter transmission<p>f(λ) ≡ flux of the spectrum<p><u>Property info:</u><ul><li><b>UCD</b>:meta.code<li><b>Utype</b>: <i>photdm:PhotometricSystem.detectorType</i></ul></td></table>',WIDTH,400)){kind=link}
 ≡ filter transmission<p><img src=showgraph.php?what=lmean&val=2718.3554756209&id=HST/WFC3_UVIS2.F275W><p>Filter transmission is transformed to "<i>energy counter</i>" for these calculations, that is, the photon count transmission is multiplied by λ and normalized so that peak transmission is equal to 1.<p><u>Property info:</u><ul><li><b>Unit</b>:Angstrom<li><b>UCD</b>:em.wl</ul></td></table>',STICKY,true,CLOSEBTN,true,WIDTH,400)){kind=link}
 ≡ filter transmission<br> Vg(λ) ≡ Vega spectrum.<p><img src=showgraph.php?what=leff&val=2713.8599647988&id=HST/WFC3_UVIS2.F275W><p>Filter transmission is transformed to "<i>energy counter</i>" for these calculations, that is, the photon count transmission is multiplied by λ and normalized so that peak transmission is equal to 1.<p><u>More info:</u><p>Vega spectrum from calspec database.<ul><li><a href="https://ui.adsabs.harvard.edu/abs/2014PASP..126..711B/abstract" target="_blank">Bohlin, Gordon, & Tremblay (2014)</a>.<li><a href="https://www.stsci.edu/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/calspec" target="_blank">STScI current calspec</a>.<li><a href="morefiles/vega.dat" target="_blank">Vega spectrum file</a> (units: Angstrom erg/cm2/s/A).</ul><p><u>Property info:</u><ul><li><b>Unit</b>:Angstrom<li><b>UCD</b>:em.wl.effective</ul></td></table>',STICKY,true,CLOSEBTN,true,WIDTH,400)){kind=link}
 ≡ filter transmission<p><img src=showgraph.php?what=lpiv&val=2702.9201281817&id=HST/WFC3_UVIS2.F275W><p>Filter transmission is transformed to "<i>energy counter</i>" for these calculations, that is, the photon count transmission is multiplied by λ and normalized so that peak transmission is equal to 1.<p><u>Property info:</u><ul><li><b>Unit</b>:Angstrom<li><b>UCD</b>:em.wl</ul></td></table>',STICKY,true,CLOSEBTN,true,WIDTH,400)){kind=link}
 ≡ filter transmission<br> Vg(λ) ≡ Vega spectrum<p><img src=showgraph.php?what=lphot&val=2724.2991758647&id=HST/WFC3_UVIS2.F275W><p>Filter transmission is transformed to "<i>energy counter</i>" for these calculations, that is, the photon count transmission is multiplied by λ and normalized so that peak transmission is equal to 1.<p><u>More info:</u><p>Vega spectrum from calspec database.<ul><li><a href="https://ui.adsabs.harvard.edu/abs/2014PASP..126..711B/abstract" target="_blank">Bohlin, Gordon, & Tremblay (2014)</a>.<li><a href="https://www.stsci.edu/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/calspec" target="_blank">STScI current calspec</a>.<li><a href="morefiles/vega.dat" target="_blank">Vega spectrum file</a> (units: Angstrom erg/cm2/s/A).</ul><p><u>Property info:</u><ul><li><b>Unit</b>:Angstrom<li><b>UCD</b>:em.wl</ul></td></table>',STICKY,true,CLOSEBTN,true,WIDTH,400)){kind=link}
 ≡ filter transmission<p>Equivalent to the horizontal size of a rectangle with height equal to maximum transmission and with the same area that the one covered by the filter transmission curve.<p><img src=showgraph.php?what=weff&val=415.49552755309,2725.9113782663,1&id=HST/WFC3_UVIS2.F275W><p>Filter transmission is transformed to "<i>energy counter</i>" for these calculations, that is, the photon count transmission is multiplied by λ and normalized so that peak transmission is equal to 1.<p><u>Property info:</u><ul><li><b>Unit</b>:Angstrom<li><b>UCD</b>:instr.bandwidth<li><b>Utype</b>: <i>photdm:PhotometryFilter.bandwidth.extent.value</i></ul></td></table>',STICKY,true,CLOSEBTN,true,WIDTH,400)){kind=link}
![(?)](javascript:Tip('<b>A<sub>f</sub>/A<sub>V</sub></b><br><table cellpadding=20><td class=helptd>Ratio between extintion at λ<sub>ref</sub> and visual extintion. <p>Calculated by the service using the extinction law by <a href="http://adsabs.harvard.edu/abs/1999PASP..111...63F" target="_blank">Fitzpatrick (1999)</a> improved by <a href="http://adsabs.harvard.edu/abs/2005ApJ...619..931I" target="_blank">Indebetouw et al (2005)</a> in the infrared. <p><img src="images/extlaw.png"><p>You can download the corresponding <a href=\"getextlaw.php\" target=\"_blank\">data file</a> for the opacity k<sub>λ</sub>. The extinction at each wavelength is calculated as: A<sub>λ</sub> = A<sub>V</sub> * k<sub>λ</sub>/k<sub>V</sub>, where k<sub>λ</sub> is the opacity for a given λ and k<sub>V</sub>=211.4<p><p><u>Property info:</u><ul></ul></td></table>',STICKY,true,CLOSEBTN,true,WIDTH,400)){kind=link}
 ≡ filter transmission.<br> Sun(λ) ≡ Sun spectrum.<p><img src="images/sun.png"><p><p>Filter transmission is transformed to "<i>energy counter</i>" for these calculations, that is, the photon count transmission is multiplied by λ and normalized so that peak transmission is equal to 1.<p><u>More info:</u><p>Sun spectrum from calspec database: sun_reference_stis_002 composed with sun_mod_001 for larger wavelengths.<ul><li><a href="https://ui.adsabs.harvard.edu/abs/2014PASP..126..711B/abstract" target="_blank">Bohlin, Gordon, & Tremblay (2014)</a>.<li><a href="https://www.stsci.edu/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/calspec" target="_blank">STScI current calspec</a>.<li><a href="morefiles/sun.dat" target="_blank">Sun composed spectrum</a> (units: Angstrom erg/cm2/s/A).</ul><p><u>Property info:</u><ul><li><b>Unit</b>:erg/cm2/s/A<li><b>UCD</b>:phot.flux.density</ul></td></table>',STICKY,true,CLOSEBTN,true,WIDTH,400)){kind=link}
 ≡ filter transmission.<br> Vg(λ) ≡ Vega spectrum.<p>F<sub>0,ν</sub>(Jy) = (2.9979246)<sup>-1</sup> 10<sup>5</sup> * λ<sub>ref</sub><sup>2</sup> * F<sub>0,λ</sub>(erg/cm<sup>2</sup>/s/A)<p>Filter transmission is transformed to \"<i>energy counter</i>\" for these calculations, that is, the photon count transmission is multiplied by λ and normalized so that peak transmission is equal to 1.<p>In the case that filter owner specifies its own values, they will be the ones provided by the service when queried through the VO.<p><u>VO PhotDM Utypes</u>: <br><i>PhotCal.MagnitudeSystem.type</i> -> VEGAmag <br><i>PhotCal.ZeroPoint.Flux.value</i> -> F<sub>0</sub><p><u>More info:</u><p>Vega spectrum from calspec database.<ul><li><a href="https://ui.adsabs.harvard.edu/abs/2014PASP..126..711B/abstract" target="_blank">Bohlin, Gordon, & Tremblay (2014)</a>.<li><a href="https://www.stsci.edu/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/calspec" target="_blank">STScI current calspec</a>.<li><a href="morefiles/vega.dat" target="_blank">Vega spectrum file</a> (units: Angstrom erg/cm2/s/A).</ul><p><u>Property info:</u><ul><li><b>UCD</b>:phot.flux.density<li><b>Utype</b>: <i>photdm:PhotCal.ZeroPoint.Flux.value</i></ul></td></table>',STICKY,true,CLOSEBTN,true,WIDTH,400)){kind=link}
