Study the X-ray Dust Scattering Halos with Chandra Observations of Cygnus X-3 and Cygnus X-1

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dc.creatorXiang, Jingen
dc.creatorZhang, Shuang Nan
dc.creatorYao, Yangsen
dc.date2004-12-20
dc.date2005-03-16
dc.date.accessioned2026-07-07T02:16:22Z
dc.date.available2026-07-07T02:16:22Z
dc.descriptionWe improve the method proposed by Yao \emph{et al} (2003) to resolve the X-ray dust scattering halos of point sources. Using this method we re-analyze the Cygnus X-1 data observed with {\it Chandra} (ObsID 1511) and derive the halo radial profile in different energy bands and the fractional halo intensity (FHI) as $I(E)=0.402\times E_{\rm keV}^{-2}$. We also apply the method to the Cygnus X-3 data ({\it Chandra} ObsID 425) and derive the halo radial profile from the first order data with the {\it Chandra} ACIS+HETG. It is found that the halo radial profile could be fit by the halo model MRN (Mathis, Rumpl $&$ Nordsieck, 1977) and WD01 (Weingartner $&$ Draine, 2001); the dust clouds should be located at between 1/2 to 1 of the distance to Cygnus X-1 and between 1/6 to 3/4 (from MRN model) or 1/6 to 2/3 (from WD01 model) of the distance to Cygnus X-3, respectively.
dc.description7 pages, 6 figures, accepted for publication in Chinese Journal of Astronomy and astrophysics, 2004 Supplements
dc.identifierhttps://arxiv.org/abs/astro-ph/0412508
dc.identifierhttp://arxiv.org/abs/astro-ph/0412508
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/8765
dc.subjectAstrophysics
dc.titleStudy the X-ray Dust Scattering Halos with Chandra Observations of Cygnus X-3 and Cygnus X-1
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