Expected Sky Background @ TAO site†

This page provides the sky background expected at the TAO site. The sky background consists of near-infrared continuous emission, airglow, and atmospheric thermal emission. The near-infrared continuous emission and the airglow emission are calculated based on the Gemini model. The atmospheric emission is calculated based on the atmospheric transmittance given on the other page predicted by the ATRAN model (Lord, S. D., 1992, NASA Technical Memorandum 103957). The emissivity and temperature of the atmosphere are assumed to be 1 - transmittance and 240 K, respectively. The precipitable water vapor (PWV) toward the zenith is set to 0.3, 0.5, 0.7, 0.9, 1.2, and 1.5 mm.

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NIR (1-6 um)†

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Overview†

&ref(): File not found: "chtrans_nir_18504ft_lon30d_zenith_smoothed2e-3um-1.png" at page "Sky Background";&ref(): File not found: "chtrans_nir_18504ft_lon30d_zenith_smoothed56e-5um-1.png" at page "Sky Background";
Near-infrared atmospheric transmittance smoothed with a Gaussian function with an FWHM of 0.002 um-1.Atmospheric transmittance around 2.7 um smoothed with a Gaussian function with an FWHM of 0.00056 um-1.
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Data†

PWV (mm)Resolution
No Smoothing0.00056 um-10.002 um-1
0.3&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv0300um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv0300um_zenith_smoothed56e-5um-1.dat" at page "Sky Background";&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv0300um_zenith_smoothed2e-3um-1.dat" at page "Sky Background";
0.5&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv0500um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv0500um_zenith_smoothed56e-5um-1.dat" at page "Sky Background";&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv0500um_zenith_smoothed2e-3um-1.dat" at page "Sky Background";
0.7&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv0700um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv0700um_zenith_smoothed56e-5um-1.dat" at page "Sky Background";&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv0700um_zenith_smoothed2e-3um-1.dat" at page "Sky Background";
0.9&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv0900um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv0900um_zenith_smoothed56e-5um-1.dat" at page "Sky Background";&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv0900um_zenith_smoothed2e-3um-1.dat" at page "Sky Background";
1.2&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv1200um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv1200um_zenith_smoothed56e-5um-1.dat" at page "Sky Background";&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv1200um_zenith_smoothed2e-3um-1.dat" at page "Sky Background";
1.5&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv1500um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv1500um_zenith_smoothed56e-5um-1.dat" at page "Sky Background";&ref(): File not found: "chtrans_nir_18504ft_lon30d_pwv1500um_zenith_smoothed2e-3um-1.dat" at page "Sky Background";
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MIR N-band (6-15 um)†

↑

Overview†

&ref(): File not found: "chtrans_mirn_18504ft_lon30d_zenith_smoothed5e-4um-1.png" at page "Sky Background";
N-band atmospheric transmittance smoothed with a Gaussian function with an FWHM of 0.0005 um-1.
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Data†

PWV (mm)Resolution
No Smoothing0.0005 um-1
0.3&ref(): File not found: "chtrans_mirn_18504ft_lon30d_pwv0300um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_mirn_18504ft_lon30d_pwv0300um_zenith_smoothed5e-4um-1.dat" at page "Sky Background";
0.5&ref(): File not found: "chtrans_mirn_18504ft_lon30d_pwv0500um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_mirn_18504ft_lon30d_pwv0500um_zenith_smoothed5e-4um-1.dat" at page "Sky Background";
0.7&ref(): File not found: "chtrans_mirn_18504ft_lon30d_pwv0700um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_mirn_18504ft_lon30d_pwv0700um_zenith_smoothed5e-4um-1.dat" at page "Sky Background";
0.9&ref(): File not found: "chtrans_mirn_18504ft_lon30d_pwv0900um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_mirn_18504ft_lon30d_pwv0900um_zenith_smoothed5e-4um-1.dat" at page "Sky Background";
1.2&ref(): File not found: "chtrans_mirn_18504ft_lon30d_pwv1200um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_mirn_18504ft_lon30d_pwv1200um_zenith_smoothed5e-4um-1.dat" at page "Sky Background";
1.5&ref(): File not found: "chtrans_mirn_18504ft_lon30d_pwv1500um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_mirn_18504ft_lon30d_pwv1500um_zenith_smoothed5e-4um-1.dat" at page "Sky Background";
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MIR Q-band (15-27 um)†

↑

Overview†

&ref(): File not found: "chtrans_mirq_18504ft_lon30d_zenith_smoothed5e-4um-1.png" at page "Sky Background";
Q-band atmospheric transmittance smoothed with a Gaussian function with an FWHM of 0.0005 um-1.
↑

Data†

PWV (mm)Resolution
No Smoothing0.0005 um-1
0.3&ref(): File not found: "chtrans_mirq_18504ft_lon30d_pwv0300um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_mirq_18504ft_lon30d_pwv0300um_zenith_smoothed5e-4um-1.dat" at page "Sky Background";
0.5&ref(): File not found: "chtrans_mirq_18504ft_lon30d_pwv0500um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_mirq_18504ft_lon30d_pwv0500um_zenith_smoothed5e-4um-1.dat" at page "Sky Background";
0.7&ref(): File not found: "chtrans_mirq_18504ft_lon30d_pwv0700um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_mirq_18504ft_lon30d_pwv0700um_zenith_smoothed5e-4um-1.dat" at page "Sky Background";
0.9&ref(): File not found: "chtrans_mirq_18504ft_lon30d_pwv0900um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_mirq_18504ft_lon30d_pwv0900um_zenith_smoothed5e-4um-1.dat" at page "Sky Background";
1.2&ref(): File not found: "chtrans_mirq_18504ft_lon30d_pwv1200um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_mirq_18504ft_lon30d_pwv1200um_zenith_smoothed5e-4um-1.dat" at page "Sky Background";
1.5&ref(): File not found: "chtrans_mirq_18504ft_lon30d_pwv1500um_zenith.dat" at page "Sky Background";&ref(): File not found: "chtrans_mirq_18504ft_lon30d_pwv1500um_zenith_smoothed5e-4um-1.dat" at page "Sky Background";
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MIR 30um-band (26-40 um)†

↑

Overview†

&ref(): File not found: "chtrans_mir30_18504ft_lon30d_zenith.png" at page "Sky Background";
Atmospheric transmittance at the 30-um band.
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Data†

PWV (mm)Resolution
No Smoothing
0.3&ref(): File not found: "chtrans_mir30_18504ft_lon30d_pwv0300um_zenith.dat" at page "Sky Background";
0.5&ref(): File not found: "chtrans_mir30_18504ft_lon30d_pwv0500um_zenith.dat" at page "Sky Background";
0.7&ref(): File not found: "chtrans_mir30_18504ft_lon30d_pwv0700um_zenith.dat" at page "Sky Background";
0.9&ref(): File not found: "chtrans_mir30_18504ft_lon30d_pwv0900um_zenith.dat" at page "Sky Background";
1.2&ref(): File not found: "chtrans_mir30_18504ft_lon30d_pwv1200um_zenith.dat" at page "Sky Background";
1.5&ref(): File not found: "chtrans_mir30_18504ft_lon30d_pwv1500um_zenith.dat" at page "Sky Background";
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