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Variability selected low luminosity active galactic nuclei in the 4 Ms chandra deep field south

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Figure 1. Fraction of variable AGNs (red circles) and galaxies (black squares) vs. net counts, where the background-subtracted (net) counts are measured in the 0.5–8.0 keV band over 4 Ms
Figure 2. The 0.5–8 keV luminosity vs. redshift distribution for CDF-S galaxies meeting the quality criteria of Section 3 (open circles)
Figure 3. Light curves for six representative CDF-S sources classified as galaxies that exhibit significant variability
Figure 5. Fraction of variable AGNs (red circles) and galaxies (black squares) vs. X-ray luminosity
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