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One millimeter continuum observations of high redshift quasars
- Source :
- Astrophysical Letters. 22(1, 19)
- Publication Year :
- 1981
- Publisher :
- United States: NASA Center for Aerospace Information (CASI), 1981.
-
Abstract
- Upper limits to the one-millimeter continuum flux densities of the high redshift quasars B2 1225 + 31, Ton 490, and PHL 957 are presented. The upper limit to the power observed from these quasars at 1 mm is, on the average, one half of the observed power in the continuum at L-alpha. These observations are used to constrain the temperature of a hypothetical dust shell which reddens the quasar line and continuum emission by an extinction optical depth sufficient to account for the anomalously low L-alpha/H-alpha 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.
- Subjects :
- Astrophysics
Subjects
Details
- Language :
- English
- Volume :
- 22
- Issue :
- 1, 19
- Database :
- NASA Technical Reports
- Journal :
- Astrophysical Letters
- Publication Type :
- Report
- Accession number :
- edsnas.19820028354
- Document Type :
- Report