This Legacy journal article was published in Volume 6, August 1995, and has not been
updated since publication. Please use the search facility above to find regularly-updated information about
this topic elsewhere on the HEASARC site.
N. E. White
The high quality CCD spectra obtained by ASCA (see the front cover) have
revealed limitations in the plasma code models, that were not important for
the previous generation of lower resolution X-ray spectrometers. This issue of
Legacy contains two articles on this issue. The first is a report on a plasma
codes workshop that was held at the Napa Valley meeting of the High Energy
Astrophysics Division of the AAS held last November and chaired by Wilt
Sanders. At this workshop the various groups working on plasma codes discussed
with the observers the various problems in modeling the data and a summary is
given here of the issues raised and discussed. A second article by Rolf Mewe,
Jella Kaastra and Duane Liedhal report on the updates to the "meka" code that
takes better account of the finer details of the atomic physics. This revised
code called "mekal" is now available in the latest version of XSPEC v9.0 and
the Utrecht spectral fitting package SPEX (also described here).
All the raw EXOSAT data is now available at the HEASARC, along with the
ESA/ESTEC interactive analysis system. This issue contains two articles that
describe the EXOSAT archive at the HEASARC and how to use it. The first
HEASARC-produced EXOSAT CD-ROM is now available containing all the images from
the mission in FITS and GIF format. This CD along with the latest volume of
ROSAT images were distributed at the past summer and winter AAS meetings. They
can be obtained upon request to the HEASARC. The data restoration effort
continues at a good pace and a progress report is given.
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