Mathematics – Logic
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...18110103r&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #101.03; Bulletin of the American Astronomical Society, Vol. 24, p.1281
Mathematics
Logic
Scientific paper
Near and mid infrared arrays, available through technology developed as part of the defense program, are revolutionizing infrared astronomy. Longward of the cutoff of extrinsic silicon detectors near 30 microns, however, there is no suitable array technology and no significant ongoing investment in developing one for defense or other nonastronomical uses. We report the results of a NASA funded program to build far infrared arrays for advanced astronomy missions such as SIRTF. We have built linear arrays of Ge:Ga photoconductors with read noises of 25 electrons, quantum efficiencies greater than 20 %, dark currents less than 100 electrons/sec, and wavelength coverage to 120 microns. These arrays can be stacked into a 32x32 format. The high performance and comparatively large format of these arrays will greatly increase the power of far infrared astronomy missions. For example, with SIRTF we would be able to survey large areas of sky to a given signal to noise at 60 microns roughly 10,000 times faster than ISO could. This performance level will enable new fields of investigation, such as deep far infrared maps to measure directly the cosmological evolution of luminous IR galaxies, or large scale mapping of the disks of nearby galaxies to locate low luminosity regions of star formation.
Rieke George H.
Young Eric T.
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