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9 The case of a single turbulent layer at a hight of 10 km above the telescope aperture. A distribution of seeing cells, each with a typical diameter T~ is moved across The angle 6' is given by the approximate the telescope pupil with the wind speed w,,,d. angular diameter of a seeing cell as seen from the telescope. It encloses the isoplanatic patch -the region on the sky over which the distribution of seeing cells over the aperture - and therefore the atmospheric point spread function - does not change significantly.

Predehl & Truemper 1994; Predehl 1995, and references therein). 7). 8) which focus the X-ray 18 The Black Hole at the Center of the Milky Way radiation onto the image plane and the science instruments which detect and record the radiation. The exposures towards the Galactic Center are dominated by the diffuse emission of the Sgr A East region, which is thermal in origin and rich in emission lines. Collected by the mirror apertures the average combined count rates from that region are of the order of several events per second.

Bolometric measurements in the near sub-mill,imeter domain: Near sub-mm bolometric measurements of the Galactic Center are possible from the ground. Chini et al. 3 mm at the 3 m diameter IRTF (Infrared Telescope Facility) on Mauna Kea, Hawaii. These measurements resulted in a map of the large scale (-20’xlO’) distribution of the cold dust. Zylka et al. (1995) used a single element 3He cooled Ge:In:Sb bolometer a t 800, 600, and 450 pm (UKT14 receiver Duncan el: al. 1990) at the James Clerk Maxwell Telescope (JCMT) to determine the flux densities of Sgr A* and to discriminate its contribution from the cold dust distribution in the central parsec.

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Physics Reports vol.244

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