Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.276l...9w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 276, Issue 1, pp. L9-L12.
Astronomy and Astrophysics
Astronomy
4
Nuclear Reactions, Nucleosynthesis, Abundances, Supernovae: General, Dust, Extinction, Galaxies: Individual: 4C 41.17, Quasars: Individual: Br 1202-0725, Infrared: Galaxies
Scientific paper
Recent millimetre and submillimetre observations of high-redshift objects have revealed the presence of large amounts of dust within them. If these observations are interpreted on the basis of standard grain models, huge masses of dust may be required, at least for some cosmological models. If the dust exists in the form of slender whiskers of iron, the relevant mass constraints are shown to be significantly relaxed. An iron whisker model is applied to explain the spectra of the distant radio galaxy 4C 41.17, at a redshift of 3.8, and the distant quasar BR 1202-0725, at a redshift of 4.69. In both these instances, spectral agreement is shown to be possible for a whisker model involving iron whiskers with a mean length 5mum emitting at a temperature of 70K. The calculated total mass of iron whiskers that is required depends on the cosmological model, but mass estimates in general do not pose a problem for any of the cases discussed. For a Friedmann cosmology with H_0=85 km s^-1 Mpc^-1 and q_0=0.5, we require of the order of 10^5 M_solar of iron in the emitting region of the galaxies concerned.
Ramadurai S.
Wickramasinghe A. N.
Wickramasinghe Chandra N.
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