JHK' Imaging Photometry of Seyfert 1 AGNs and Quasars I: Multi-Aperture Photometry

Abstract

Near-infrared $JH{K}^{\prime }$ imaging photometry was obtained of 331 AGNs consisting mainly of Seyfert 1 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 $M_B=-29$ 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 $H-K^{\prime }$ 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 ($7.49^{\prime \prime }$) are more QSO-like than those observed with larger apertures up to 15 pixels ($16.1^{\prime \prime }$). 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.

References in corpus (2)

• $JH{K}^{\prime }$ Imaging Photometry of Seyfert 1 AGNs and Quasars III: Variability of Radio Quiet and Radio Loud AGNs
• $JH{K}^{\prime }$ Imaging Photometry of Seyfert 1 AGNs and Quasars II: Observation of Long-Term Variability

Cited by in corpus (7)

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• Near Infrared Variability of obscured and unobscured X-ray selected AGN in the COSMOS field
• Planck-scale constraints on anisotropic Lorentz and CPT invariance violations from optical polarization measurements
• Search for anisotropic Lorentz invariance violation with γ-rays
• The Combined NVSS-FIRST Galaxies (CoNFIG) Sample - I. Sample Definition, Classification and Evolution
• $JH{K}^{\prime }$ Imaging Photometry of Seyfert 1 AGNs and Quasars III: Variability of Radio Quiet and Radio Loud AGNs
• $JH{K}^{\prime }$ Imaging Photometry of Seyfert 1 AGNs and Quasars II: Observation of Long-Term Variability