|
| CFHT/MegaCam.u | 3676.12 | 3692.62 | 3747.03 | 3147.51 | 4018.39 | 452.67 | 2027.26 | 4.5e-9 | CFHT | MegaCam | MegaCam 3rd generation u filter (installed in 2015) | | CFHT/MegaCam.u_1 | 3799.43 | 3817.72 | 3884.38 | 3317.46 | 4263.39 | 525.36 | 2673.86 | 5.55e-9 | CFHT | MegaCam | MegaCam 1st generation u filter (installed in 2002, valid until 2015). | | CFHT/MegaCam.g | 4763.98 | 4824.01 | 4721.06 | 3945.22 | 5572.03 | 1292.77 | 4001.50 | 5.29e-9 | CFHT | MegaCam | MegaCam 3rd generation g filter (installed in 2015) | | CFHT/MegaCam.g_1 | 4846.42 | 4899.92 | 4803.42 | 4043.20 | 5767.78 | 1293.80 | 3979.98 | 5.08e-9 | CFHT | MegaCam | MegaCam 1st generation g filter (installed in 2002, valid until 2015). | | CFHT/MegaCam.g_1 | Filter Description | Filter ID (?) : | CFHT/MegaCam.g_1 |
| Description (?) : | MegaCam 1st generation g filter (installed in 2002, valid until 2015). |
| Phot.System (?) : | MegaCam |
| Detector Type (?) : | Photon counter |
| Band Name (?) : | g |
| 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 (?) : |
4846.42 | ------- | (Angstrom) |
| λmean (?) : |
4899.92 | ------- | (Angstrom) |
| λcen (?) : |
4874.36 | ------- | (Angstrom) |
| λeff (?) : |
4803.42 | ------- | (Angstrom) |
| λpeak (?) : |
5385.00 | ------- | (Angstrom) |
| λpivot (?) : |
4846.42 | ------- | (Angstrom) |
| λphot (?) : |
4839.07 | ------- | (Angstrom) |
| λmin (?) : |
4043.20 | ------- | (Angstrom) |
| λmax (?) : |
5767.78 | ------- | (Angstrom) |
| Weff (?) : |
1293.80 | ------- | (Angstrom) |
| FWHM (?) : |
1452.65 | ------- | (Angstrom) |
| Af/AV (?) : |
1.18 | ------- | () |
| Fsun (?) : |
189.14 | ------- | (erg/cm2/s/A) |
| Transmission
Data file: ascii, VOTable Reference for filter response:
MegaPipe Transmission components: Filter + CCD + Instrument + Other optical components + Atmosphereid:CFHT/MegaCam.g_1
You can download here the GaiaXPy base XML file for the full CFHT/MegaCam 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 (?) : |
------- |
5.07995e-9 | (erg/cm2/s/A) |
| |
------- |
3979.98 | (Jy) |
| ZP Type (?) : |
Pogson |
| PhotCal ID (?) : |
CFHT/MegaCam.g_1/Vega |
| |
AB System | Property | Specified | Calculated | Unit | | Zero Point (?) : |
------- |
4.63452e-9 | (erg/cm2/s/A) |
| |
------- |
3631.00 | (Jy) |
| ZP Type (?) : |
Pogson |
| PhotCal ID (?) : |
CFHT/MegaCam.g_1/AB |
| |
ST System | Property | Specified | Calculated | Unit | | Zero Point (?) : |
------- |
3.631e-9 | (erg/cm2/s/A) |
| |
------- |
2844.77 | (Jy) |
| ZP Type (?) : |
Pogson |
| PhotCal ID (?) : |
CFHT/MegaCam.g_1/ST |
| |
|
Filter added: 2020-05-01 08:37:09
Last update: 2021-07-27 18:54:07 | | CFHT/MegaCam.gri | 5672.58 | 6017.74 | 5376.10 | 3951.30 | 8257.04 | 3715.01 | 3558.61 | 3.32e-9 | CFHT | MegaCam | MegaCam 3rd generation gri filter (installed in 2015). | | CFHT/MegaCam.r_1 | 6245.27 | 6278.19 | 6207.19 | 5401.98 | 7051.03 | 1120.20 | 3143.50 | 2.42e-9 | CFHT | MegaCam | MegaCam 1st generation r filter (installed in 2002, valid until 2015). | | CFHT/MegaCam.r | 6382.59 | 6425.46 | 6335.65 | 5617.62 | 7220.25 | 1381.63 | 3078.43 | 2.27e-9 | CFHT | MegaCam | MegaCam 3rd generation r filter (installed in 2015) | | CFHT/MegaCam.i_2 | 7542.83 | 7584.46 | 7497.31 | 6664.65 | 8563.89 | 1409.39 | 2577.07 | 1.36e-9 | CFHT | MegaCam | MegaCam 2nd generation g filter (installed in 2007, valid until 2015). | | CFHT/MegaCam.i_1 | 7653.53 | 7690.49 | 7613.75 | 6742.25 | 8774.10 | 1220.84 | 2531.34 | 1.3e-9 | CFHT | MegaCam | MegaCam 1st generation g filter (installed in 2002, valid until 2007). | | CFHT/MegaCam.i | 7682.93 | 7721.06 | 7641.20 | 6912.36 | 8638.34 | 1342.04 | 2520.29 | 1.28e-9 | CFHT | MegaCam | MegaCam 3rd generation i filter (installed in 2015) | | CFHT/MegaCam.z_1 | 8815.00 | 8857.61 | 8793.44 | 7959.74 | 10561.54 | 1040.08 | 2246.43 | 8.67e-10 | CFHT | MegaCam | MegaCam 1st generation z filter (installed in 2002, valid until 2015). | | CFHT/MegaCam.z | 8979.62 | 9004.78 | 8969.53 | 8358.10 | 10075.78 | 788.11 | 2239.54 | 8.33e-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</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=4899.9171364487&id=CFHT/MegaCam.g_1><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=4803.4163577189&id=CFHT/MegaCam.g_1><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=4846.4200286292&id=CFHT/MegaCam.g_1><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=4839.0722180161&id=CFHT/MegaCam.g_1><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=1293.8029626464,4874.3576657589,1&id=CFHT/MegaCam.g_1><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}
