期刊
ASTROPHYSICAL JOURNAL
卷 619, 期 1, 页码 L7-L10出版社
IOP PUBLISHING LTD
DOI: 10.1086/424734
关键词
space vehicles : instruments; surveys; telescopes; ultraviolet : general
We report the first year's on-orbit performance results for the Galaxy Evolution Explorer (GALEX), a NASA Small Explorer that is performing a survey of the sky in two ultraviolet bands. The instrument comprises a 50 cm diameter modified Ritchey-Chretien telescope with a 1degrees.25 field of view, selectable imaging and objective-grism spectroscopic modes, and an innovative optical system with a thin-film multilayer dichroic beam splitter that enables simultaneous imaging by a pair of photon-counting, microchannel-plate, delay-line readout detectors. Initial measurements demonstrate that GALEX is performing well, meeting its requirements for resolution, efficiency, astrometry, bandpass definition, and survey sensitivity.
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