One millimeter continuum observations of high redshift quasars

Journal Article · Thu Jan 01 04:00:00 EST 1981 · Astrophys. Lett.; (United States)

OSTI ID:5399121

Ennis, D J ^[1]; Soifer, B T ^[2]

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1. Palomar Observatory, Pasadena, CA
2. NASA, Ames Research Center, Space Sciences Div., Moffett Field, CA

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.

• OSTI ID: 5399121
• Journal Information: Astrophys. Lett.; (United States), Journal Name: Astrophys. Lett.; (United States) Vol. 22:1; ISSN ASTLA
• Country of Publication: United States
• Language: English

Related Subjects

640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASTRONOMY
COSMIC DUST
COSMIC RADIO SOURCES
DUSTS
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
ENERGY SPECTRA
FLUX DENSITY
INFRARED RADIATION
LINE WIDTHS
QUASARS
RADIANT FLUX DENSITY
RADIATIONS
RADIOASTRONOMY
RED SHIFT
SPECTRA
TEMPERATURE DISTRIBUTION
ULTRAVIOLET RADIATION