Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223..763m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 223, Dec. 15, 1986, p. 763-786.
Astronomy and Astrophysics
Astronomy
23
Cosmology, Dark Matter, Stellar Evolution, Stellar Mass, Stellar Models, Stellar Radiation, Background Radiation, Black Holes (Astronomy), Intergalactic Media, Red Shift
Scientific paper
It has been suggested that the first generation of stars may have been very massive objects which existed for a brief period and left a large fraction of the mass of the Universe in black hole remnants which now provide the dynamical "dark matter". If the radiation from these stars was not thermalized to distort the microwave background, it would be present today as a separate cosmological isotropic background radiation. The author calculates the expected spectrum from such a population of stars under a variety of assumptions about their environment and the intergalactic medium. By comparing the expected background with observed upper limits with such radiation fields, upper limits to the density provided by such stars can be obtained. Using the present observational data, the simplest model indicates that such stars cannot close the Universe if they formed at a redshift of less than 40, and cannot even provide missing mass equal to one-tenth of the critical density if they existed at a redshift of less than 30. In all models, such stars must have formed at redshifts greater than 5 if they form the dark matter in haloes.
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