ACISABS.1.1

The data analysis software listed here has been created and contributed by Chandra observers for use by other observers. These tools have not been developed, tested or supported by the Chandra X-ray Center software team. The software products may not be compatible with CIAO file fields, especially header information. In particular, once you analyse data outside CIAO it may be hard to return that data to CIAO. The CXC is unable to change or fix the software, or to answer questions about it.

For questions or suggestions, contact the author directly at chartas@astro.psu.edu.

Software Name: ACISABS.1.1

Contributor: George Chartas

Date submitted to the Contributed Software site: 7/9/2002

Institution: Penn State University

Software Description: This model by George Chartas and Konstantin Getman at PSU is a first attempt at correcting for the absorption caused by molecular contamination of the ACIS optical blocking filters. The user needs to supply the number of days between Chandra launch and observation. The ACISABS parameters related to the composition of the hydrocarbon and the rate of decay should be frozen and not modified. The present version of ACISABS is to be used for the analysis of bare ACIS I and ACIS S data. The present version of ACISABS requires the standard qe file vN0003 instead of the optional vN0004 file be used in mkarf. Because of the present large uncertainty in the ACIS gain at energies below 350eV we recommend that events in the 0-350eV range be ignored in the spectral analysis until the gain issue is resolved.

Web page on which software and information is available: http://www.astro.psu.edu/users/chartas/xcontdir/xcont.html

Operating system(s) on which the software will run:

• Operating systems that support XSPEC

Language used: xspec model