Mathematics – Logic
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...215...11k&link_type=abstract
Astrophysical Journal, Part 1, vol. 215, July 1, 1977, p. 11-19.
Mathematics
Logic
7
Astronomical Models, Astronomical Spectroscopy, Galactic Structure, Red Shift, Spectral Energy Distribution, Astronomical Photometry, Cosmology, Halos, Interstellar Magnetic Fields, Near Infrared Radiation, Quasars, Radiant Flux Density
Scientific paper
The paper considers whether the young massive-halo models of Ostriker and Thuan (1973) could be detected as extended objects at large redshifts (i.e., primeval galaxies). The far-UV spectral energy distribution emitted by a young halo and redshifted to the present epoch is computed for different slopes of the initial mass function in the framework of a standard Friedmann cosmology with zero cosmological constant, and its temporal evolution is followed. The results show that if the present deceleration parameter (q) is as large as 0.5, then young massive halos would be accessible to spectrophotometry and should have been detected in different surveys. For q of 0.05, it is found that a young massive halo would appear an order of magnitude fainter and would not have been detected in the surveys. Meier's (1976) suggestion that some primeval galaxies may have already been discovered as quasars is discussed critically.
Kaufman Maike
Thuan Trinh Xuan
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