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The Ariel 5 and UK6 Satellites
The SA3C Xray Observatory
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absorption accretion active galaxies angle angular Ap.J arc minutes arc second arcmin arcsec astr Astrophys baseline binary systems bremsstrahlung charged particle clusters of galaxies collimator compact object components Copernicus count rate Cyg X-1 Cygnus density detected detector diffuse effective area electrons emitting energy range EXOSAT field of view Figure flat-top flux FWHM Galactic Centre globular clusters grating spectrometer halo Heuvel high resolution identification imaging telescope infrared instrument intensity interstellar interstellar medium low energy luminosity lunar occultation mapping measurements medium energy neutron star noise Observation Programme observatory optical orbit photon energy positional accuracy proportional counter pulsar pulse radiation radio sources radio trail reflector region Roche lobe SAS-C satellite scattering sensitive shows soft X-ray spacecraft spectral spectrum spin axis stellar wind supernova remnants Table UHURU variable variations wavelengths window X-ray astronomy X-ray background X-ray emission X-ray luminosity X-ray sources