The IR night sky - Night sky emission lines
ISAAC R=10,000 night sky atlas
CRIRES R=100,000 night sky atlas (coming soon)
SINFONI flux calibrated spectra of the night sky
Raw and flux calibrated SINFONI (R=2000-4000) spectra of the night sky for the J, H and K atmospheric windows are available in the following table as FITS files. Note that diurnal and annual variations in the brightness of the night sky are significant. In partiuclar, the OH lines are strongest at the beginning of the night and reach a minimum a few hours before the end of the night. Other important considerations are the lunar fraction and the distance of the field from the moon, the external temperature (only important for the K band), the amount of precipitable water and the airmass.
For the raw data, the units are electrons/second/sq. arc second. For comparison, predictions from the SINFONI ETC are also available.
For the flux calibrated data, the units are ergs/second/Angstrom/cm^2/sq. arc second. The flux calibration is accurate to 20%.
You are free to use these data as you wish.
|Atmospheric Window||UT Time||Raw counts /Flux calibrated||Airmass||Time after sunset||Lunar Fraction and distance||Transparency|
|J||2005-10-31T00:33||Raw / Calibrated||1.27||01:30||Down||Photometric|
|J||2006-03-13T06:04||Raw / Calibrated||1.07||06:56||0.97 and 40 degrees||Clear|
|H||2005-04-02T23:59||Raw / Calibrated||1.29||01:13||Down||Photometric|
|H||2005-04-03T06:31||Raw / Calibrated||1.03||07:45||0.36 and 80 degrees||Photometric|
|K||2005-08-11T00:53||Raw / Calibrated||1.15||02:23||0.30 and 80 degrees||Clear|
|K||2006-04-04T07:13||Raw / Calibrated||1.09||08:17||0.36 and 80 degrees||Photometric|
|K||2005-04-03T10:04||Raw / Cailbrated||1.19||28 min. into morning twilight||0.36 and 50 degrees||Photometric|