JHK ′ Imaging Photometry of Seyfert 1 Active Galactic Nuclei and Quasars. I. Multiaperture Photometry

Open Access
Publisher Website
Google Scholar
Abstract
Near-infrared JHK' imaging photometry was obtained of 331 AGNs consisting mainly of Seyfert 1 active galactic nuclei (AGNs) and quasars (QSOs). This sample was selected to cover a range of radio emission strength, redshift from z = 0 to 1, and absolute B magnitude from MB = -29 mag to -18 mag. Among low-z AGNs with z < 0.3, Seyfert 1-1.5 AGNs are distributed over a region from a location typical of galaxies to a location typical of QSOs in the two-color J-H to H-K' diagram, but Seyfert 1.8-2 AGNs are distributed around the location of galaxies. Moreover, bright AGNs with respect to absolute B magnitude are distributed near the location of QSOs, while faint AGNs are near the location of galaxies. The distribution of such low-z AGNs in this diagram was found to have little dependence on their 6 cm radio flux. The near-infrared colors of the AGNs observed with an aperture of 7 pixels (749) are more QSO-like than those observed with larger apertures up to 15 pixels (161). This aperture effect may be explained by contamination from the light of host galaxies within larger apertures. This effect is more prominent for less luminous AGNs.
All Related Versions

This publication has 14 references indexed in Scilit: