NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-25 T09:07:31 PDT
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For refcode 2002ApJS..141...23E:
Retrieve 331 NED objects in this reference.
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NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2002ApJS..141...23E JHK' Imaging Photometry of Seyfert 1 Active Galactic Nuclei and Quasars. I. Multiaperture Photometry Keigo Enya, Yuzuru Yoshii, Yukiyasu Kobayashi, Takeo Minezaki, Masahiro Suganuma, Hiroyuki Tomita, and Bruce A. Peterson Received 2001 October 28; accepted 2002 February 5 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 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' 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") are more QSO-like than those observed with larger apertures up to 15 pixels (16.1"). 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. Subject headings: galaxies: active - galaxies: photometry - galaxies: Seyfert - infrared: galaxies - quasars: general
Retrieve 331 NED objects in this reference.
Please click here for ADS abstract

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