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After a two month in-orbit checkout period, GALEX began nominal operations. GALEX was launched by a Pegasus-XL vehicle into a 29 degree inclination, 690 km circular orbit on April 28, 2003. The satellite is shown during integration in Figure 1, with solar panels in the deployed position. The satellite mass is 277 kg, and orbit averaged power is 279W. The instrument is coupled to a Orbital Sciences Corporation spacecraft that is three-axis stabilized, with fixed GaAs solar panels, a NiH battery, an X-band transmitter and S-band transmitter and receivers. GALEX is performed with a wide-field (1.2 degree) UV-optimized instrument consisting of a 50 cm modified Ritchey-Chr étien telescope, a selectable imaging window or grism, a dichroic beam splitter and corrector, a far ultraviolet and near ultraviolet sealed tube microchannel plate detectors, and support electronics.
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Using this local ``calibration'', we will study distant galaxies over the redshift range $0.3 We will combine UV images and spectra with data obtained from the Sloan Digital Sky Survey, 2dF, 2MASS, IRAS, ISO, and a suite of nearby galaxy surveys to determine the definitive relationship between global UV properties and physical properties of galaxies. We will do this using studies of nearby, spatially resolved galaxies, and in large samples of more distant low redshift galaxies. We will measure the relationship of UV to star formation rate, extinction, starburst history, initial mass function, and metallicity. With GALEX we seek to study the UV properties of galaxies in the local universe. This will support a wide variety of investigations made possible by the first UV sky survey. The GALEX mission will include an Associate Investigator program for additional observations and supporting data analysis. We will apply this calibration to distant galaxies discovered in the deep imaging and spectroscopic surveys to map the history of star formation in the universe over the red shift range zero to two. We will use the measured UV properties of local galaxies, along with corollary observations, to calibrate the UV-global star formation rate relationship in galaxies. A rotating wheel provides either imaging or grism spectroscopy with transmitting optics. The instrument includes a 50 cm modified Ritchey-Chr étien telescope, a dichroic beam splitter and astigmatism corrector, two large sealed tube microchannel plate detectors to simultaneously cover the two bands and the 1.2 degree field of view. Three spectroscopic grism surveys (R=100-300) are underway with various depths (m AB~20-25) and sky coverage (100 to 2 square degrees) over the 1350-2800 Å band. Five imaging surveys in each of two bands (1350-1750 Å and 1750-2800 Å) range from an all-sky survey (limit m AB~20-21) to an ultra-deep survey of 4 square degrees (limit m AB~26). GALEX is will performing the first Space Ultraviolet sky survey. The Galaxy Evolution Explorer (GALEX) is a NASA Small Explorer Mission launched April 28, 2003. 4854, Future EUV-UV and Visible Space Astrophysics Missions and Instrumentation.
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2003, “The Galaxy Evolution Explorer”, SPIE Conf. MISSION AND SCIENCE OPERATIONS AND DATA ANALYSISīased upon Martin et al. Instrument Ground Calibration and Performanceĥ. This website is kept for archival purposes only and is no longer updated.Ĥ.7.