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most citedBlack holes, gravitational waves and fundamental physics: a roadmap

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astro-ph.HE2017★ 51 cited

A Possible ~20 yr Periodicity in Long-term Optical Photometric and Spectral Variations of the Nearby Radio-Quiet Active Galactic Nucleus Ark 120

Yan-Rong Li, Jian-Min Wang, Zhi-Xiang Zhang +15

We study the long-term variability in the optical monitoring database of Ark~120, a nearby radio-quiet active galactic nucleus (AGN) at a distance of 143 Mpc (z=0.03271). We compil…