Accurate Determination of the Dust-Scattering Halo Around Cyg X-2

Details Accurate Determination of the Dust-Scattering Halo Around Cyg X-2 Accurate Determination of the Dust-Scattering Halo Around Cyg X-2

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006cxo..prop.2270s&link_type=abstract

Chandra Proposal ID #08910231

Physics

Chandra Proposal Id #08910231

Scientific paper

In a short time, one million events can be collected from the bright dust-scattered halo around CYG X-2. The ACIS observation is the first serious attempt to observe azimuthal structure in a dust-scattering halo. If structure due to nonuniformity of the gas and dust permits, we will measure the quadrupole moment of the halo which might indicate scattering from partially-aligned non-spherical grains in the path to the source. Systematic instrument effects will be identified by observing at different roll angles. We will also extract the radial dependence of surface brightness from 5" to 15' in several energy bands and use these data to investigate the applicability of several dust models. Model parameters will be derived concerning size and spatial distribution of dust particles.

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