Observing Primeval Galaxies and Dark Matter with LAIRTS
Final rept. 1 Feb 1985-31 Aug 1988
MICHIGAN UNIV ANN ARBOR HARRISON M RANDALL LAB OF PHYSICS
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Observations of the extragalactic background light have been made at three wavelengths using our CCD system with a large angular field of view on the McGraw-Hill 1.3 m telescope. Data has been obtained at high galactic latitudes to reduce complications resulting from foreground stars and galaxies and from infrared cirrus. Exposures from overlapping fields were obtained to check the internal consistency of the data. Also, a grid of scattering profiles was obtained in which a star was imaged at many different positions on an off the CCD to take account of scattering contributions. Because the fields contained so many foreground stars and galaxies, it was necessary to develop an automated technique using a matched filter to pick out these objects and to then subtract them from the data. This has been accomplished for fields consisting of one- quarter of a CCD field. Our data analysis has yielded an amplitude for the power spectrum which is about 2.5 times larger than calculated using a model with no galaxy luminosity evolution. Recently, Tyson has shown some clear evidence for galaxy luminosity evolution which while not quantitative qualitatively explains our data. Other work during this funding period has been on the nature of dark matter, speckle inteferametric resolution of the binary star system Mu Cassioppeiae, and a measurement of the temperature of the cosmic background radiation at 2.64 mm.