SRG/ART-XC discovery of SRGA J204318.2+443815: towards the complete population of faint X-ray pulsars

  title={SRG/ART-XC discovery of SRGA J204318.2+443815: towards the complete population of faint X-ray pulsars},
  author={Alexander A. Lutovinov and Sergey S. Tsygankov and Ilya A Mereminskiy and Sergey V. Molkov and Andrei N. Semena and Vadim A. Arefiev and Ilfan F. Bikmaev and A. A. Djupvik and Marat Gilfanov and Dmitri I. Karasev and Igor Y. Lapshov and Pavel Medvedev and A Shtykovsky and Rashid A. Sunyaev and Andrew Tkachenko and Shreya Anand and Michael C. B. Ashley and K. De and Mansi M. Kasliwal and Shrinivas R. Kulkarni and J. van Roestel and Yuhan Yao},
  journal={Astronomy \& Astrophysics},
We report the discovery of the new long-period X-ray pulsar SRGAJ204318.2+443815/SRGeJ204319.0+443820 in a Be binary system. The source was found in the second all-sky survey by the Mikhail Pavlinsky ART-XC telescope on board the SRG mission. The follow-up observations with XMM-Newton , NICER, and NuSTAR allowed us to discover a strong coherent signal in the source light curve with a period of ∼ 742s. The pulsed fraction was found to depend on an increase in energy from ∼ 20% in soft X-rays to… 
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