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29 March 2024
 
  » arxiv » astro-ph/0409626

 Article overview


A puzzling event during the X-ray emission of the binary system GX 1+4
Nanda Rea ; Luigi Stella ; Gian Luca Israel ; Giorgio Matt ; Silvia Zane ; Alberto Segreto ; Tim Oosterbroek ;
Date 27 Sep 2004
Subject astro-ph
AffiliationINAF-OAR; SRON), Luigi Stella (INAF-OAR), Gian Luca Israel (INAF-OAR), Giorgio Matt (Univ. Rome3), Silvia Zane (MSSL), Alberto Segreto (CNR, PA) and Tim Oosterbroek (ESTEC
AbstractWe report on a long X-ray observation of the slow-rotating binary pulsar GX 1+4. BeppoSAX observed, in the 0.1-200 keV energy range, an event in which the source flux dropped for almost a day, and then recovered. During this event only the high-energy emission was found to be pulsed and the pulsations were shifted in phase of ~0.2 . The spectrum during the event was well fitted by a Compton-reflection model. A broad iron line at ~6.55 keV was present outside of the event, where instead two narrow emission lines at ~6.47 keV and ~7.05 keV were detected. The pulse profile was highly variable as a function of both energy and time. We interpret this low-flux event as an occultation of the direct X-ray emission, due to the increase of a torus-like accretion disk; we then discuss similarities between this source and the recently discovered highly absorbed INTEGRAL sources.
Source arXiv, astro-ph/0409626
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