Computer Science
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hrxs.confe..26n&link_type=abstract
High Resolution X-ray Spectroscopy with XMM-Newton and Chandra, Proceedings of the international workshop held at the Mullard Sp
Computer Science
Scientific paper
The grating instruments on board Chandra and XMM-Newton cover a variety of chances and limitations. While the LETGS offers the largest wavelength range with high sensitivity the MEG and the HEG have a much higher spectral resolution. A very popular method to analyze the grating spectra is the He-like triplets because they are density sensitive and a large temperature range is covered with different ions ranging from C V (~1 MK) up to Si XIII (~15 MK). However, only the LETGS wavelength range covers all these triplets simultaneously, while with the MEG the C V and the N VI triplets are not measurable and the HEG can only measure Si XIII, Mg XI, and Ne IX. The Ne IX triplet can be measured with all instrument, but with different success. The triplet line are in principle resolved by all grating, but severe blending with Fe XIX line can hamper the analysis in the hotter plasmas, e.g., active stars or flares. In those cases highest spectral resolution is highly desirable, and the LETGS is not sufficient to resolve all blending lines. The most popular X-ray calibration target is Capella and it has been observed with all gratings with significant exposure times. We gathered together all available data of the HEG and MEG (155 ksec), the LETGS (219 ksec) for comparative analysis of the Ne IX triplet. 18 emission lines can be identified in the region around 13.5 A with the HEG. Good agreement of these lines with predictions from a theoretical model constructed from the APEC line database using an emission measure distribution derived from Fe IX to Fe XXIV lines can be seen. These 18 emission lines cannot be identified in the LETGS spectrum, but we show that these spectra are consistent with the wavelengths and fluxes measured with the HEG.
Brickhouse Nancy S.
Drake Jeremy J.
Huenemoerder David P.
Ness Jan-Use
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