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Suzaku observation of Be / X-ray binary pulsar EXO 2030+375

Sachindra Naik  Gaurava K.Jaisawal  
【摘要】:We study the timing and spectral properties of Be/X-ray binary pulsar EXO 2030+375 using a Suzaku observation taken on 2012 May 23,during a less intense Type I outburst.Pulsations were clearly detected in the X-ray light curves at a barycentric period of 41.2852 s,which suggest that the pulsar is spinning-up.The pulse profiles were found to be peculiar,e.g.unlike those obtained from the earlier Suzaku observation acquired on 2007 May 14.A single-peaked narrow profile at soft X-rays(0.5–10 ke V range)changed to a double-peaked broad profile in the 12–55 ke V energy range and again reverted back to a smooth single-peaked profile at hard X-rays(55–70 ke V range).The 1.0–100.0 ke V broadband spectrum of the pulsar was found to be well described by three continuum models described as(i)a partial covering high energy cut-off power-law model,(ii)a partially absorbed power-law with highenergy exponential rolloff and(iii)a partial covering Negative and Positive power law with EXponential(NPEX)continuum model.Unlike the earlier Suzaku observation during which several low energy emission lines were detected,a weak and narrow Iron Kαemission line at 6.4 ke V was only present in the pulsar spectrum during the2012 May outburst.Non-detection of any absorption like feature in the 1–100 ke V energy range supports the claim of the absence of the cyclotron resonance scattering feature in EXO 2030+375 from the earlier Suzaku observation.Pulse-phase resolved spectroscopy revealed the presence of additional dense matter causing the absence of a second peak from the soft X-ray pulse profiles.The details of the results are described in the paper.

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