Submillimeter spectrophotometry for measuring the peculiar radial velocities of galaxy clusters

Details Submillimeter spectrophotometry for measuring the peculiar radial velocities of galaxy clusters Submillimeter spectrophotometry for measuring the peculiar radial velocities of galaxy clusters

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pazh...10..260s&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 10, Apr. 1984, p. 260-268) Soviet Astronomy Letters (ISSN 0360-0327), vol. 10, Mar.-Apr

Astronomy and Astrophysics

Astronomy

Astronomical Photometry, Galactic Clusters, Radial Velocity, Spaceborne Astronomy, Submillimeter Waves, Background Radiation, Black Body Radiation, Cosmic Gases, Cosmic Rays, Electron Energy, Spectrophotometry, Wave Scattering, X Ray Spectra

Scientific paper

The possibility of determining the peculiar velocities of clusters of galaxies using sub-mm data is examined. Measurement of the velocities is attractive because then it may be theoretically possible to resolve conflicts between the large primordial density fluctuations needed for galaxies and clusters to form and the observed small fluctuations in the 3 K background. The cluster velocity dispersion would need to be limited and sensitive to the mean density of the clusters. It is shown that data on the electron temperature of the intergalactic gas within the cluster are sufficient for determining the peculiar radial velocity of the gas as a whole. A cryogenically-cooled bolometer with 10 to the -15th W/sq rt of the frequency could provide the velocity estimates with an accuracy close to 300 km/sec if mounted on a spacecraft.

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