Discovery of Periodic Dips in the Brightest Hard X-Ray Source of M31 with EXTraS

@article{Marelli2017DiscoveryOP,
  title={Discovery of Periodic Dips in the Brightest Hard X-Ray Source of M31 with EXTraS},
  author={Martino Marelli and Andrea Tiengo and Andrea De Luca and David Salvetti and Luca Saronni and Lara Sidoli and Adamantia Paizis and Ruben Salvaterra and Andrea Belfiore and Gian Luca Israel and Frank Haberl and Daniele D’Agostino},
  journal={The Astrophysical Journal Letters},
  year={2017},
  volume={851}
}
We performed a search for eclipsing and dipping sources in the archive of the EXTraS project—a systematic characterization of the temporal behavior of XMM-Newton point sources. We discovered dips in the X-ray light curve of 3XMM J004232.1+411314, which has been recently associated with the hard X-ray source dominating the emission of M31. A systematic analysis of XMM-Newton observations revealed 13 dips in 40 observations (total exposure time of ∼0.8 Ms). Among them, four observations show two… 
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