XSPEC is the most widely used spectral analysis software in the X-ray astrophysics field.
It provides an easy-to-implement way by which end users can fit observed data using their
original spectral models. Sometimes young students can be addicted to chi-square minimization
XSPEC is the most widely used spectral analysis software in the X-ray astrophysics field.
It provides an easy-to-implement way by which end users can fit observed data using their
original spectral models. Sometimes young students can be addicted to chi-square minimization
using phenomenological models such as a power-law model. It is
The talk concentrates on practical aspects of spectral analysis using an original spectral model.
Mass accreting white dwarf stars with strong magnetic field (so-called magnetic cataclysmic
variables) are introduced as an example target of model construction. By applying a constructed
original model, some physical parameters, such as the white dwarf mass and Fe abundance,
are extracted from wide-band spectra observed with the Suzaku satellite. Some physical aspects
related to accreting white dwarf stars, the mass-radius relation, the Chandrasekhar mass limit,
and the Rankine-Hugoniot shock relation, are also mentioned for introductory purposes.
In the talk, the following items are covered:
- numerical calculation of X-ray spectra from a hot plasma in a magnetic cataclysmic variables
- the standard FITS format for the XSPEC Table model, and how to convert the calculated spectra
into a FITS file
- the standard function format for the XSPEC Function model, and how to compile a function into
an XSPEC-loadable shared library
- how to use the constructed model in XSPEC (Table and Function)
- fit observed spectra with the constructed model
- demonstrations!
Reference:
Yuasa et al., 2010, A&A, 520, A25
http://ads.nao.ac.jp/abs/2010A%26A...520A..25Y