Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprb17058l&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The soft x-ray region of 20 - 50 Å is nearly unknown territory to astrophysicists. This spectral band remains virtually unstudied, even in solar observations, and laboratory measurements are similarly lacking. Spectra obtained from Chandra and XMM-Newton X-Ray Observatories show a wealth of lines in this region, albeit weak in most cases. Most of these lines remain unidentified as observations have now outpaced the available databases. In support of these missions we have undertaken laboratory measurements of astrophysically relevant ions in the extreme ultraviolet and soft x-ray regions using the Livermore electron beam ion trap EBIT-II. We present here results of argon, covering ArIX - ArXVI between 20 - 50 Åand compare our spectra with calculations from the Hebrew University - Lawrence Livermore Atomic Code HULLAC. EBIT-II data agree broadly with HULLAC calculations, with accuracy of ± 0.3 Å for most major lines. Given the density of lines in Chandra and XMM-Newton spectra, this accuracy is often insufficient for line identification in the absence of careful laboratory mesaurements. Work performed under auspices of DOE by UC LLNL and funded by NASA SARA.
Behar Ehud
Beiersdorfer Peter
Chen Haibin
Kahn Steve M.
Lepson J. K.
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