Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.284..323a&link_type=abstract
Nature, vol. 284, Mar. 27, 1980, p. 323, 324.
Astronomy and Astrophysics
Astronomy
15
Cosmic Dust, Emission Spectra, Infrared Astronomy, Quasars, Astronomical Spectroscopy, Galactic Radiation, Interstellar Matter, Line Spectra, Seyfert Galaxies, Spectral Resolution, Telescopes, Thermal Radiation
Scientific paper
The discovery of the 3.3-micron emission line in the quasar 3C 273 is presented as evidence for the existence of dust grains in the quasar. Spectroscopic observations of 3C 273 were made using an IR photometer-spectrometer attached to a 3.9-m telescope covering the region 3.68-3.96 microns with a spectral resolution of 0.08 microns. An unresolved emission feature is observed at a wavelength corresponding to 3.26 microns at the redshift of 3C 273, within experimental uncertainty. It is suggested that the 3.3 micron feature and the 1-10-micron continuum are due to thermal radiation from dust at temperatures from a few hundred to 1000 K lying at distances from 10 to 100 pc from the central energy source.
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