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Hard x ray observations of the extragalactic sky: the High Energy Focusing Telescope and the Serendipitous Extragalactic X ray Source Identification survey

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Figure 2.1: The sensitivity of HEFT for observations from a balloon platform (left) com-pared to the large-area coded aperture instruments GRIP and GRATIS, and from a satelliteplatform (right) shown relative to current and future x-ray and gamma-ray instruments.The energy bandwidth is ∆E/E = 50%, and the balloon observations assume an atmosphericcolumn depth of 3.5 g cm−2.
Table 2.2: HEFT physical parameters
Figure 2.3: Top: The HEFT optic mounting and alignment procedure. Bottom: HEFTuncoated prototype optic on the mounting assembly fixture.
Figure 3.1: Schematic diagram of a multilayer coating with notation corresponding to thatused in the text
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