HETG Software
Overview The main HETG-related software are briefly described below; these are related through the common data products of FITS event files (either from a real observation or from a MARX simulation) and PHA, ARF, and RMF files:
Observation --> FITS events --> CIAO --> PHA,ARF,RMF --> ISIS <-- models or: MARX w/marx2fits
CIAO, Chandra Interactive Analysis of Observations, is the comprehensive software provided by the CXC for user data processing and analysis, including HETG observations. See, for example, the Analysis Guide for Chandra High Resolution Spectroscopy and the Data Preparation (for ACIS) and Grating Spectroscopy Threads.
ISIS, is an interactive application, by virtue of the S-Lang interpreter, that supports the display, measurement, and identification of features in high-resolution spectra. ISIS can load HETG PHA spectra (and corresponding ARFs and RMFs) and interfaces with ATOMDB, a database of atomic structure and plasma emission models. ISIS can also import the XSPEC library of X-ray source models. ISIS lovers are using ISIS for a wide range of analyses.
| ISIS allows the user to add (with a little programming effort) their own custom models; see the simple isis-3D example. |  |
MARX, is a ray-trace simulator for Chandra including the HETG. MARX is useful for HETG simulations especially for extended sources and those with spatial-spectral complexity. The source modeling capabilities of MARX are extended with the MARX-S-Lang-User model which can make use of the simple V3D volumetric modeling primatives.
