7-5:

xassist website
http://xassist.pha.jhu.edu/

http://xassist.pha.jhu.edu/pipeline4/chandra/3305/acisf03305/report/fullrun_ccd1_acisf03305_pi14-548_pass1_cl_src1.html
http://xassist.pha.jhu.edu/pipeline4/chandra/3305/acisf03305/report/index.html


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I am trying to get a better grasp of what the different models actually are modeling.

http://heasarc.nasa.gov/xanadu/xspec/manual/Models.html


-Apec model
An emission spectrum, from collisionally-ionized, reduced gas.
For motivation, see:

http://atomdb.org/

-Bremms
A thermal bremstrahlung spectrum

http://adsabs.harvard.edu/abs/1975ApJ...199..299K
http://adsabs.harvard.edu/cgi-bin/bib_query?1961ApJS....6..167K

-Diskline model
a line emission from a relativistic accretion disk see the paper below for motivation.



http://adsabs.harvard.edu/abs/1989MNRAS.238..729F