A research team led by Prof. Wang Junxian and Ph.D. students Kang Jialai from University of Science and Technology of China (USTC) of the Chinese Academy of Science (CAS) has revealed a marvelous, composite eclipsing absorber (see the 3D animated diagram below) responsible for a highly distinct X-ray eclipse event in active galaxy NGC 6814. The paper, titled 'What can be learnt from a highly informative X-ray occultation event in NGC 6814? A marvelous absorber' was published in Monthly Notices of the Royal Astronomical Society on August 23.
. AGN ubiquitously produce strong X-ray emissions, believed to originate in a compact region near the central black hole, the so-called corona.
Such eclipse events are rare and unpredictable, with less than five full eclipse events with clear ingress/egress periods captured so far. Meanwhile, the interpretation of these events is also challenging, because AGN is intrinsically variable and one can hardly distinguish the intrinsic variation from the variation caused by the eclipsing absorption.
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