Abstract Details

Name: Jayashree Roy
Affiliation: IUCAA
Conference ID: ASI2021_213
Title : Study of recent outburst in the Be/X-ray binary RX J0209.6−7427 with AstroSat: a new ULX pulsar in the Magellanic Bridge?
Authors and Co-Authors : Amar Deo Chandra(1), Jayashree Roy(2), P. C. Agrawal(3), Manojendu Choudhury(2): (1)Center of Excellence in Space Sciences India, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, West Bengal, India (2)Inter-University Center for Astronomy and Astrophysics, Post Bag 4, Pune, Maharashtra 411007, India (3)UM-DAE Centre for Excellence in Basic Sciences, University of Mumbai, Vidyanagari Campus, Kalina, Santacruz (East), Mumbai, Maharashtra 400098, India
Abstract Type : Oral
Abstract Category : Stars, ISM and Galaxy
Abstract : We present the timing and spectral studies of RX J0209.6–7427 during its rare 2019 outburst using observations with the Soft X-ray Telescope (SXT) and Large Area X-ray Proportional Counter (LAXPC) instruments on the AstroSat satellite. Pulsations having a periodicity of 9.29 s were detected for the first time by the NICER mission in the 0.2–10 keV energy band and, as reported here, by AstroSat over a broad energy band covering 0.3–80 keV. The pulsar exhibits a rapid spin-up during the outburst. Energy resolved folded pulse profiles are generated in several energy bands in 3–80 keV. To the best of our knowledge, this is the first report of the timing and spectral characteristics of this Be binary pulsar in hard X-rays. There is suggestion of evolution of the pulse profile with energy. The energy spectrum of the pulsar is determined and from the best-fitting spectral values, the X-ray luminosity of RX J0209.6−7427 is inferred to be 1.6 × 10^39 erg/s. Our timing and spectral studies suggest that this source has features of an ultraluminous X-ray pulsar in the Magellanic Bridge. Details of the results are presented and discussed in terms of the current ideas.