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Published 1981 | Published
Journal Article Open

One Millimeter Continuum Observations of High Redshift Quasars


Upper limits to the one-millimeter continuum flux densities of the high redshift quasars 82 1225 + 31, Ton 490, and PHL 957 are presented. The upper limit to the power observed from these quasars at I mm is, on average, ½ the observed power in the continuum at Lɑ. These observations are used to constrain the temperature of a hypothètical dust shell which reddens the quasar line and continuum emission by an extinction optical depth sufficient to account for the anomalously low Lɑ/Hɑ emission line ratio observed in each of these quasars. For the quasars studied, dust shell temperatures between 25 K and 50 to 95 K are prohibited by the present data. A dust shell at a temperature within this span reradiating all the power absorbed from the quasar ultraviolet continuum would produce a one-millimeter flux density greater than the measured upper limit. The average radius of the model dust shell cannot be between 70 kpc and 1 Mpc.

Additional Information

© 1981 Gordon and Breach. Received May 8, 1981. We are grateful to T. Roellig and J. Houck for assistance with the observations and to K. Sellgren for helpful discussions. This work was supported by NASA research grants.

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Published - 1981ApL____22___13E.pdf


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August 19, 2023
March 5, 2024