Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199..943h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 199, June 1982, p. 943-952.
Astronomy and Astrophysics
Astronomy
106
Astronomical Spectroscopy, Infrared Astronomy, Quasars, Red Shift, Astronomical Catalogs, Colorimetry, Cosmic Dust, Emission Spectra, Thermal Emission
Scientific paper
New infrared data from a significant number of quasars with redshifts out to 3.12 are presented. The J-H and H-K colors are highly redshift dependent, becoming larger at smaller redshifts. When the effects of emission lines in the bandpasses have been taken into account, these colors demand the presence of excess continuum emission in the 1-3 micron region, over and above the continuum components present at shorter and longer wavelengths. This excess is interpreted in terms of thermal emission from hot dust, which is shown to exist predominantly in regions where the broad emission lines are formed. The colors of a mean zero-redshift quasar have been determined to be 0.95 for J-H and 1.15 for H-K. These can be combined with various percentages of typical galaxy colors to form a locus which is populated by Seyfert galaxies.
Allen David A.
Hyland A. R.
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