HEAD 2003 Meeting
Session 22. Missions, Instruments and Data Analysis
Poster, Sunday-Wednesday, March 23, 2003, Duration of Meeting

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[22.11] Line Spread Function of CHANDRA HETG: application

K. Ishibashi (MIT/CSR)

Instrumental spectral line profile of CHANDRA HETG instrument is known to be skewed. Hence a simple Gaussian function as a fitting kernel is not an appropriate action for line profile analysis. In the worst case, it may mislead observers to think that observed spectral lines are naturally skewed. In order to minimize such blunders, CHANDRA HETG users are recommended to make their own response matrix functions (RMFs) based on a set of parameterized line spread functions (LSFPARMS) provided with CHANDRA CALDB (version 2.17 or higher), and then to use their RMFs to define a line fitting kernel in their favorite fitting tools.

This presentation will provide descriptions on the current state of calibration for LSFPARMS of CHANDRA HETG instrument. And this work will also illustrate the use of the LSFPARMS (or RMF) products by analyzing real spectral lines of stellar X-ray sources.

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Bulletin of the American Astronomical Society, 35#2
© 2003. The American Astronomical Soceity.