Abstract
This paper describes the Advanced X-ray Astrophysics Facility (AXAF), a program of the National Aeronautics and Space Administration (NASA). AXAF is a large free-flying observatory featuring a high performance x-ray telescope. Through advances in the technology of large x-ray optics and science instrumentation, AXAF will be capable of forming images of astronomical objects in x-ray light that will go far beyond the previous highly successful HEAO-B (Einstein) Observatory. Its pictures will be 10 times sharper; it will be able to detect sources 100 times fainter; it will cover twice the energy band; and it will be 1,000 times more sensitive for observing the detailed energy profile of sources. The increased sensitivity of AXAF will permit the study of active galaxies, quasars, and clusters of galaxies at very large distances. The optical system, pointing and control system, and instrument complement are presented in sufficient detail for a good understanding of overall AXAF advancements and capabilities.
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