Filling in the X-ray Halo around GX13+1

Details Filling in the X-ray Halo around GX13+1 Filling in the X-ray Halo around GX13+1

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1841s&link_type=abstract

Chandra Proposal ID #06910296

Mathematics

Chandra Proposal Id #06910296

Scientific paper

GX13+1 is a bright, highly-absorbed LMXB with a strong X-ray halo. Prior Chandra data showed the dust towards GX13+1 is neither huge nor ``fluffy,'' as had been suggested, but pileup in the ACIS CCDs means that Chandra's full angular resolution could not be used. We propose a short HRC-I observation to fill in the inner 50'', which in combination with earlier observations will determine if the data agree with modern dust models such as the Weingartner & Draine (2001) model or prefer the 1977 Mathis, Rumpl & Nordsieck model. This observation will also be sensitive to clouds near the source which might explain the apparent discrepancy between the low column densities measured towards GX13+1 from the X-ray halo and the higher results found from the X-ray spectrum.

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