Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...18110404m&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #104.04; Bulletin of the American Astronomical Society, Vol. 24, p.1289
Astronomy and Astrophysics
Astrophysics
Scientific paper
Several current cosmic microwave background radiation (CMBR) experiments, probing angular scales from arcminutes to 180(deg) are detecting structures in the sky at levels of 2 to 20 parts per million. The question of whether this structure stems from primordial, extragalactic, or local sources, or is a result of instrumental effects has important consequences for the interpretation of the measurements. The Differential Microwave Radiometer (DMR) experiment on the Cosmic Background Explorer Satellite (COBE\ () ) has detected structure at angles larger than 7(deg) \ with high statistical significance in all-sky maps at three frequencies. A strong case can be made against galactic or instrumental sources for the structure. Comparing the COBE result with other experiments with differing angular resolution and frequency coverage will confirm the detection and verify the the cosmic origin of the structure. The goal of the CMBR anisotropy measurements has come into sharper focus as a result of the COBE measurements. The search for any structure will become a program to measure the fluctuation power spectrum over a large range of scales from the largest, where the evolution can be expected to be linear, to smaller scales, where non-linear galaxy and cluster evolution began. The measurement of the wavelength dependence of anisotropy is an excellent method for further CMBR study. Not only is this the key tool for discriminating between CMBR fluctuations and foregrounds such as the Galaxy, it can put limits on post-recombination events which may have modified the primordial spatial and wavelength fluctuation spectrum. () COBE is supported by NASA's Astrophysics Division. Goddard Space Flight Center (GSFC), under the scientific guidance of the COBE Science Working Group, is responsible for the development and operation of COBE.
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