Follow-up Chandra observation of 4U 1705-44

Details Follow-up Chandra observation of 4U 1705-44 Follow-up Chandra observation of 4U 1705-44

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1681d&link_type=abstract

Chandra Proposal ID #06400656

Computer Science

Chandra Proposal Id #06400656

Scientific paper

We propose Chandra/HETGS observations of the bright atoll source 4U 1705-44 for 30 ks, to perform a detailed study of the iron K-shell features. A first Chandra observation of this source shows the presence of an iron Kalpha line at 6.6 keV, that is found to be intrinsically broad (FWHM about 1.7 keV) and with a complex profile. Although very interesting, these results need to be confirmed by a follow-up Chandra observation. This is due to the fact that during the first observation the source was very bright; although the pile up in the HEG spectra was still negligible, this unexpectedly resulted in small systematic differences between the +1 and -1 orders spectra. We therefore propose to re-observe this source using instrumental modes more appropriate for such a bright source.

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