Near-infrared variable AGNs derived by cross-identification
We developed a cross-identification system which largely shortens the processing time. The system can lightly perform even cross-identification between catalogues including a large number of sources. We examined near-infrared variability of Active Galactic Nuclei (AGNs) using this cross-identification system. We first cross-identified Two Micron All Sky Survey (2MASS) catalogue with two AGN catalogues (namely, Quasars and Active Galactic Nuclei (12th Ed.) and SDSS-DR5 quasar catalog), and extracted a 2MASS counterpart for a source in the AGN catalogues. Each AGN with a 2MASS counterpart was further cross-identified with DENIS and UKIDSS catalogues. On the basis of standard deviations for magnitude difference between 2MASS/DENIS or 2MASS/UKIDSS, we extracted the sources with magnitude difference over 3σ as near-infrared variable AGNs. We discuss correlations between near-infrared variability and physical parameters (i.e., redshift, luminosity, and a near-infrared color).
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