Keck :W.M. Keck Observatory Keck/LWS :The Long Wavelength Spectrometer (LWS) is a Keck facility instrument offering diffraction-limited imaging and spectroscopy in the 3-25 µm range from the forward Cassegrain focus on Keck I. |
| Keck/LWS.0800 | 83621.16 | 83848.39 | 83249.87 | 75585.97 | 94239.81 | 11239.31 | 54.75 | 2.37e-13 | Keck | LWS | LWS 8.0, 7.81-8.94 | | Keck/LWS.0890 | 88186.17 | 88310.07 | 87987.00 | 82133.59 | 95439.44 | 8178.02 | 49.42 | 1.91e-13 | Keck | LWS | LWS 8.9, 8.39-9.27 | | Keck/LWS.0990 | 100386.96 | 100468.48 | 100252.73 | 94902.09 | 106799.58 | 7448.99 | 38.50 | 1.15e-13 | Keck | LWS | LWS 9.9, 9.67-10.42 | | Keck/LWS.Nwide | 101095.38 | 104871.31 | 95317.17 | 73559.35 | 137327.02 | 52412.14 | 36.98 | 1.22e-13 | Keck | LWS | LWS Nwide, 7.73-13.31 | | Keck/LWS.1070 | 106692.03 | 107099.57 | 106025.98 | 89710.00 | 129900.00 | 15698.97 | 34.05 | 9.08e-14 | Keck | LWS | LWS 10.7, 9.92-11.47 | | Keck/LWS.Spec10 | 107837.08 | 114452.14 | 98001.94 | 72999.19 | 154200.00 | 68146.79 | 32.10 | 1.0e-13 | Keck | LWS | LWS Spec 10, >7.52 µm (long pass) | | Keck/LWS.Spec10 | Filter Description | Filter ID (?) : | Keck/LWS.Spec10 |
| Description (?) : | LWS Spec 10, >7.52 µm (long pass) |
| Phot.System (?) : | LWS |
| Detector Type (?) : | Energy counter |
| Band Name (?) : | ------ |
| Obs. Facility (?) : | Keck |
| Instrument (?) : | LWS |
| Comments (?) : | The SiC filter is better suited for broad band imaging with LWS |
| | Mathematical properties | Property | Calculated | Specified | Unit | | λref (?) : |
107837.08 | ------- | (Angstrom) |
| λmean (?) : |
114452.14 | ------- | (Angstrom) |
| λcen (?) : |
114500.65 | ------- | (Angstrom) |
| λeff (?) : |
98001.94 | ------- | (Angstrom) |
| λpeak (?) : |
105700.00 | ------- | (Angstrom) |
| λpivot (?) : |
107837.08 | ------- | (Angstrom) |
| λphot (?) : |
101751.15 | ------- | (Angstrom) |
| λmin (?) : |
72999.19 | ------- | (Angstrom) |
| λmax (?) : |
154200.00 | ------- | (Angstrom) |
| Weff (?) : |
68146.79 | ------- | (Angstrom) |
| FWHM (?) : |
78646.20 | ------- | (Angstrom) |
| Af/AV (?) : |
0.0775 | ------- | () |
| Fsun (?) : |
0.021 | ------- | (erg/cm2/s/A) |
| Transmission
Data file: ascii, VOTable Reference for filter response:
Keck: LWS Transmission components: Filter | | Calibration properties
Vega System | Property | Specified | Calculated | Unit | | Zero Point (?) : |
------- |
1.0021e-13 | (erg/cm2/s/A) |
| |
------- |
32.10 | (Jy) |
| ZP Type (?) : |
Pogson |
| PhotCal ID (?) : |
Keck/LWS.Spec10/Vega |
| |
AB System | Property | Specified | Calculated | Unit | | Zero Point (?) : |
------- |
1.13339e-11 | (erg/cm2/s/A) |
| |
------- |
3631.00 | (Jy) |
| ZP Type (?) : |
Pogson |
| PhotCal ID (?) : |
Keck/LWS.Spec10/AB |
| |
ST System | Property | Specified | Calculated | Unit | | Zero Point (?) : |
------- |
3.631e-9 | (erg/cm2/s/A) |
| |
------- |
1163254.95 | (Jy) |
| ZP Type (?) : |
Pogson |
| PhotCal ID (?) : |
Keck/LWS.Spec10/ST |
| |
|
Filter added: 2011-10-18 05:24:43
Last update: 2020-12-10 16:32:20 | | Keck/LWS.1170 | 116779.87 | 116928.66 | 116543.05 | 109007.19 | 125423.43 | 10433.13 | 28.57 | 6.31e-14 | Keck | LWS | LWS 11.7, 11.15-12.25 | | Keck/LWS.SiC | 117037.57 | 117666.68 | 116007.42 | 100724.57 | 133615.15 | 22190.58 | 28.36 | 6.32e-14 | Keck | LWS | LWS SiC, 10.64-12.96 | | Keck/LWS.1250 | 126138.63 | 126320.84 | 125843.39 | 117069.89 | 136331.94 | 11779.82 | 24.56 | 4.65e-14 | Keck | LWS | LWS 12.5, 12.01-13.25 | | Keck/LWS.1765 | 177315.20 | 177400.71 | 177174.39 | 167592.96 | 187781.45 | 8881.96 | 12.57 | 1.2e-14 | Keck | LWS | LWS 17.65, 17.31-18.16 | | Keck/LWS.1875 | 187397.87 | 187474.97 | 187264.34 | 177868.02 | 196880.31 | 9066.17 | 11.22 | 9.6e-15 | Keck | LWS | LWS 18.75, 18.31-19.20 | | Keck/LWS.2310 | 230978.24 | 231033.80 | 230886.21 | 220595.57 | 241806.14 | 7881.79 | 7.43 | 4.18e-15 | Keck | LWS | LWS 23.1, 22.74 - 23.47 | | Keck/LWS.2450 | 245219.25 | 245271.42 | 245133.44 | 235056.43 | 255735.63 | 8001.37 | 6.60 | 3.29e-15 | Keck | LWS | LWS 24.5, 24.16 - 24.90 |
|
| 
 ≡ filter transmission<p><u>Property info:</u><ul><li><b>Unit</b>:Angstrom<li><b>UCD</b>:em.wl<li><b>Utype</b>: <i>photdm:PhotometryFilter.SpectralAxis.Coverage.Location.Value</i></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.SpectralAxis.Coverage.Bounds.Extent</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>Utype</b>: <i>photdm:PhotometricSystem.detectorType</i></ul></td></table>',WIDTH,400)){kind=link}
 ≡ filter transmission<p><img src=showgraph.php?what=lmean&val=114452.13509224&id=Keck/LWS.Spec10><p><u>Property info:</u><ul><li><b>Unit</b>:Angstrom<li><b>UCD</b>:em.wl<li><b>Utype</b>: <i>photdm:PhotometryFilter.SpectralAxis.Coverage.Location.Value</i></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=98001.942431288&id=Keck/LWS.Spec10><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=107837.08242497&id=Keck/LWS.Spec10><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=101751.14724914&id=Keck/LWS.Spec10><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=68146.79315336,114500.64872214,0.9731&id=Keck/LWS.Spec10><p><u>Property info:</u><ul><li><b>Unit</b>:Angstrom<li><b>UCD</b>:instr.bandwidth<li><b>Utype</b>: <i>photdm:PhotometryFilter.SpectralAxis.Coverage.Bounds.Extent</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/extinctionlaw.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/sunspec.png><p><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>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}
