CFHT :Canada-France-Hawaii Telescope CFHT/MegaCam :MegaPrime/MegaCam is the wide-field optical imaging facility at CFHT. |
| CFHT/MegaCam.u | 3676.12 | 3692.62 | 3751.88 | 3142.90 | 4018.28 | 452.67 | 2149.33 | 4.58e-9 | CFHT | MegaCam | MegaCam 3rd generation u filter (installed in 2015) | | CFHT/MegaCam.u_1 | 3799.43 | 3817.72 | 3884.74 | 3315.16 | 4261.79 | 525.36 | 2762.05 | 5.49e-9 | CFHT | MegaCam | MegaCam 1st generation u filter (installed in 2002, valid until 2015). | | CFHT/MegaCam.g | 4763.97 | 4824.01 | 4722.38 | 3938.88 | 5570.92 | 1292.78 | 3918.94 | 5.27e-9 | CFHT | MegaCam | MegaCam 3rd generation g filter (installed in 2015) | | CFHT/MegaCam.g_1 | 4846.42 | 4899.92 | 4804.10 | 4038.12 | 5760.79 | 1293.80 | 3902.42 | 5.07e-9 | CFHT | MegaCam | MegaCam 1st generation g filter (installed in 2002, valid until 2015). | | CFHT/MegaCam.gri | 5672.61 | 6017.76 | 5381.29 | 3951.30 | 8257.04 | 3714.96 | 3198.84 | 3.31e-9 | CFHT | MegaCam | MegaCam 3rd generation gri filter (installed in 2015). | | CFHT/MegaCam.r_1 | 6245.26 | 6278.19 | 6207.89 | 5394.27 | 7046.08 | 1120.20 | 3115.34 | 2.42e-9 | CFHT | MegaCam | MegaCam 1st generation r filter (installed in 2002, valid until 2015). | | CFHT/MegaCam.r | 6382.58 | 6425.46 | 6336.47 | 5614.81 | 7218.06 | 1381.63 | 3045.54 | 2.27e-9 | CFHT | MegaCam | MegaCam 3rd generation r filter (installed in 2015) | | CFHT/MegaCam.r | Filter Description | Filter ID (?) : | CFHT/MegaCam.r |
| Description (?) : | MegaCam 3rd generation r filter (installed in 2015) |
| Phot.System (?) : | MegaCam |
| Detector Type (?) : | Photon counter |
| Band Name (?) : | ------ |
| Obs. Facility (?) : | CFHT |
| Instrument (?) : | MegaCam |
| Comments (?) : | The filter response includes the full telescope (mirror+optics+CCD) response and also 1.25 airmasses of atmospheric attenuation. |
| | Mathematical properties | Property | Calculated | Specified | Unit | | λref (?) : |
6382.58 | ------- | (Angstrom) |
| λmean (?) : |
6425.46 | ------- | (Angstrom) |
| λcen (?) : |
6403.70 | ------- | (Angstrom) |
| λeff (?) : |
6336.47 | ------- | (Angstrom) |
| λpeak (?) : |
5760.70 | ------- | (Angstrom) |
| λpivot (?) : |
6382.58 | ------- | (Angstrom) |
| λphot (?) : |
6365.18 | ------- | (Angstrom) |
| λmin (?) : |
5614.81 | ------- | (Angstrom) |
| λmax (?) : |
7218.06 | ------- | (Angstrom) |
| Weff (?) : |
1381.63 | ------- | (Angstrom) |
| FWHM (?) : |
1478.52 | ------- | (Angstrom) |
| Af/AV (?) : |
0.849 | ------- | () |
| Fsun (?) : |
162.07 | ------- | (erg/cm2/s/A) |
| Transmission
Data file: ascii, VOTable Reference for filter response:
MegaPipe Transmission components: Filter + CCD + Instrument + Other optical components + Atmosphere | | Calibration properties
Vega System | Property | Specified | Calculated | Unit | | Zero Point (?) : |
------- |
2.274e-9 | (erg/cm2/s/A) |
| |
------- |
3045.54 | (Jy) |
| ZP Type (?) : |
Pogson |
| PhotCal ID (?) : |
CFHT/MegaCam.r/Vega |
| |
AB System | Property | Specified | Calculated | Unit | | Zero Point (?) : |
------- |
2.71114e-9 | (erg/cm2/s/A) |
| |
------- |
3631.00 | (Jy) |
| ZP Type (?) : |
Pogson |
| PhotCal ID (?) : |
CFHT/MegaCam.r/AB |
| |
ST System | Property | Specified | Calculated | Unit | | Zero Point (?) : |
------- |
3.631e-9 | (erg/cm2/s/A) |
| |
------- |
4862.95 | (Jy) |
| ZP Type (?) : |
Pogson |
| PhotCal ID (?) : |
CFHT/MegaCam.r/ST |
| |
|
Filter added: 2013-01-26 13:10:26
Last update: 2020-12-10 16:28:37 | | CFHT/MegaCam.i_2 | 7542.83 | 7584.47 | 7498.28 | 6663.06 | 8554.97 | 1409.45 | 2569.47 | 1.37e-9 | CFHT | MegaCam | MegaCam 2nd generation g filter (installed in 2007, valid until 2015). | | CFHT/MegaCam.i_1 | 7653.53 | 7690.48 | 7613.68 | 6742.25 | 8774.10 | 1220.83 | 2528.59 | 1.31e-9 | CFHT | MegaCam | MegaCam 1st generation g filter (installed in 2002, valid until 2007). | | CFHT/MegaCam.i | 7682.93 | 7721.07 | 7641.47 | 6911.51 | 8630.94 | 1342.04 | 2516.75 | 1.29e-9 | CFHT | MegaCam | MegaCam 3rd generation i filter (installed in 2015) | | CFHT/MegaCam.z_1 | 8815.00 | 8857.62 | 8794.48 | 7955.97 | 10551.52 | 1040.06 | 2251.78 | 8.73e-10 | CFHT | MegaCam | MegaCam 1st generation z filter (installed in 2002, valid until 2015). | | CFHT/MegaCam.z | 8979.62 | 9004.78 | 8972.59 | 8356.94 | 10072.98 | 788.11 | 2246.38 | 8.37e-10 | CFHT | MegaCam | MegaCam 3rd generation z filter (installed in 2015) |
|
| 
 ≡ 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=6425.4611284797&id=CFHT/MegaCam.r><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 (photon counter)<br> Vg(λ) ≡ Vega spectrum<p><img src=showgraph.php?what=leff&val=6336.467604547&id=CFHT/MegaCam.r><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=6382.5845680299&id=CFHT/MegaCam.r><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 (photon counter)<br> Vg(λ) ≡ Vega spectrum<p><img src=showgraph.php?what=lphot&val=6365.1780120958&id=CFHT/MegaCam.r><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=1381.6284893321,6403.7041749323,0.5246814&id=CFHT/MegaCam.r><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 (photon counter).<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 (photon counter).<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}
