Time FWHM Dates filter (s) (arcsec) Air Mass
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Observing Conditions at Mount Graham: Vatican Advanced Technology Telescope UBVR Sky Surface Brightness and Seeing Measurements from 1999 through 2003
We present measurements of sky surface brightness and seeing on Mount Graham, obtained at the Vatican Advanced Technology Telescope (VATT) during 16 observing runs between 1999 April and 2003 December. We show that the sky surface brightness is significantly darker during photometric conditions and can be highly variable over the course of a single observing run, as well as from one run to the ...
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We have investigated the optimization of Al0.2Ga0.8N layers directly grown on sapphire by metalorganic vapor phase epitaxy (MOVPE). The quality of the AlGaN epilayers was improved by in situ nano-masking employing ultra-thin SiNx interlayers. Transmission electron microscopy (TEM) investigations reveal an enormous reduction of edge-type dislocations by SiNx nano-masking. Furthermore, formation ...
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We use Hubble Space Telescope Wide-Field Camera 3 (HST/WFC3) rest-frame optical imaging to select a pilot sample of star-forming galaxies in the redshift range z = 2.00 − 2.65 whose multicomponent morphologies are consistent with expectations for major mergers. We follow up this sample of major merger candidates with Keck/NIRSPEC longslit spectroscopy obtained in excellent seeing conditions (FW...
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متن کامل17 Lecture, 28 October 1999
The refractive index of air is close to unity, but not close enough to spare astronomers from one of their most persistent adversaries, turbulence. Energy from solar and local sources is constantly pumped into the atmosphere between telescope and celestial object, changing the temperature and pressure of the air where it is absorbed, in a manner that leads to a variety of fluid instabilities. T...
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