Near-infrared photometry of high redshift quasars

Details Near-infrared photometry of high redshift quasars Near-infrared photometry of high redshift quasars

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...192...13r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 192, no. 1-2, March 1988, p. 13-18.

Astronomy and Astrophysics

Astrophysics

2

Emission Spectra, Infrared Photometry, Quasars, Red Shift, Astronomical Photometry, Line Spectra, Near Infrared Radiation

Scientific paper

NIR (JHK) photometry of six quasars with redshifts ranging from 3 to 3.78 is reported. None of these objects has previously been observed in the IR. Their NIR colors are bluer than those of low-redshift quasars. They do, however, exhibit a considerable scatter, which can be qualitatively explained by line-emission contamination within the IR bandpasses. For a larger sample of quasars with redshifts greater than 2.5, the J-H and H-K color indices show opposite trends in their respective color vs redshift diagrams. These opposite trends, and the fact that the J-K colors exhibit no clear redshift dependence suggest that any trends of the continuum of quasars that might point to some kind of evolutionary effects, if present, are at a level that is completely hidden by contamination of the IR bands by quasar emission lines.

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