Large Telescope O-IR Astronomy from the Ground

Details Large Telescope O-IR Astronomy from the Ground Large Telescope O-IR Astronomy from the Ground

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ngst.conf..110w&link_type=abstract

The Next Generation Space Telescope, p. 110

Physics

Optics

Imaging Techniques, Adaptive Optics, Diffraction, Infrared Telescopes, Space Observations (From Earth), Background Radiation, Sky Brightness, Airglow, Ambient Temperature, Astronomical Interferometry

Scientific paper

What you would like me to say, is that large telescope diffraction limited observations can't be done from the ground. Failing that, you would like me to say it CAN be done from the ground. I bring you the worst message of all. We don't know whether it can be done from the ground. Or rather, that we suspect that some things can be done from the ground, and some cannot be done from the ground, and it will take a great deal, of observational and experimental work to find where the boundary lies. There are of course some things that will never be done from the ground, because the atmosphere absorbs too much. Thus the region from 3000 to 912A is totally reserved for space observations. Similarly, telescopes on the ground will always have some surfaces with noticeable emissivity at ambient temperature. There will thus be an IR background that limits the sensitivity of equipment at wavelengths beyond 3 or 5 microns. And at some wavelengths airglow will make space the preferred location because of its reduced sky brightness. But in between lies the bulk of the region where astronomy has cut its teeth, and where we know most. That is the obvious region to advance with diffraction limited imaging by large telescopes.

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