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Change in spin-down rate and detection of emission line in HMXB 4U 2206\(+\)54 with AstroSat observation

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Abstract

This work presents timing and spectral analysis of 4U 2206\(+\)54 using data obtained from LAXPC instrument onboard India’s AstroSat mission. This source was observed with AstroSat in September–October 2016. We report detection of 5648 (4) s pulsations at MJD 57669 in the latter observation of 4U 2206\(+\)54. The pulse profile is sinusoidal and the inherent shape is independent of energy up to 30 keV. The pulse fraction increases with energy from \(\sim \)0.5 to \(\sim \)0.8%. We report an updated spin-down rate of \(2.95 (14) \times 10^{-7}\) s s\(^{-1}\). This is about 0.40 times smaller than the previously reported long term value. The energy spectrum is best modeled with an absorbed power-law with high energy exponential cut-off. We have detected presence of broad emission line in 4U 2206\(+\)54 at an energy of 7 keV with equivalent width of \(\sim \)0.4 keV.

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Notes

  1. https://www.tifr.res.in/~astrosat_laxpc/LaxpcSoft.html.

  2. http://astrosat-ssc.iucaa.in/?q=data_and_analysis.

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Acknowledgements

This work has made use of data from the AstroSat mission of the Indian Space Research Organisation (ISRO), archived at the Indian Space Science Data Centre (ISSDC). We thank the LAXPC Payload Operation Center (POC) and the SXT POC at TIFR, Mumbai, for providing necessary software tools. We have also made use of software provided by the High Energy Astrophysics Science Archive Research Center (HEASARC), which is a service of the Astrophysics Science Division at NASA/GSFC. CJ acknowledges the financial grant received from Research and Development Cell of Hansraj College.

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Authors and Affiliations

  1. Hansraj College, University of Delhi, Delhi, 110007, India

    Chetana Jain & Ajay Yadav

  2. Astronomy & Astrophysics, Raman Research Institute, C. V. Raman Avenue, Bangalore, 560080, India

    Rahul Sharma

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  1. Chetana Jain
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  2. Ajay Yadav
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  3. Rahul Sharma
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Correspondence to Chetana Jain.

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Jain, C., Yadav, A. & Sharma, R. Change in spin-down rate and detection of emission line in HMXB 4U 2206\(+\)54 with AstroSat observation. J Astrophys Astron 43, 101 (2022). https://doi.org/10.1007/s12036-022-09890-z

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