1.25-mm continuum observations of very high-redshift QSOs: Is there dust at Z = 4.69?

Details 1.25-mm continuum observations of very high-redshift QSOs: Is there dust at Z = 4.69? 1.25-mm continuum observations of very high-redshift QSOs: Is there dust at Z = 4.69?

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.267l...9m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 267, no. 2, p. L9-L12

Astronomy and Astrophysics

Astronomy

96

Cosmic Dust, Emission Spectra, Infrared Spectra, Quasars, Red Shift, Starburst Galaxies, Thermal Emission, Continuums, Cosmology, Radio Astronomy, Stellar Luminosity

Scientific paper

We report the results of 1.25-mm observations with the IRAM 30-m telescope of five optically selected Quasi-Stellar Objects (QSOs), and five radio-selected QSOs with high redshifts. Five of the QSOs have redshifts greater than 4. We discuss the detectability of thermal dust-like spectra and show that, for a dust spectrum with Td = 80 K, the detectability for constant mass increases almost linearly with redshift between redshifts of 1 and 10. For the radio-loud QSOs the 1.25-mm observations indicate a steepening of the radio continuum, from a median spectral index of + 0.3 between 20 and 6 cm to approximately -0.7 over the range 6 cm to 1.25 mm.

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