superkerr

The superkerr XSPEC model: for continuum fitting in the general Kerr metric.

More detailed README

See the pdf file README_superkerr for more detailed instructions.

Paper

This repository contains the XSPEC model that was developed in Mummery, Balbus and Ingram 2023.

Please cite this paper if you use this model.

Code

• The main program is a fortran90 file superkerr.f90
• Raytracing modules are included in the fortran90 file amodules.f90, and associated X.mod files.
• Files to load this into XSPEC load.xcm and lmodel.dat is also included.

Full model input parameter description

All of the model parameters are listed below, along with their units and limits of validity.

Parameter	Units	range
$M $	Solar masses	$0 < M $
$a_\star $	Dimensionless	$-\infty < a_\star < \infty$
$i $	Degrees	$0 < i < 90$
$\dot M$	$L_{\rm edd}/c^2 $	$0 < \dot M$
$\delta_{\cal J}$	Dimensionless	$0 < \delta_{\cal J} < 1$
${\tt norm}$	1/kpc$^2$	$0 < {\tt norm}$

Loading into XSPEC

• For use in the XSPEC software (https://heasarc.gsfc.nasa.gov/xanadu/xspec/)
• XSPEC requires the files: lmodel.dat, load.xcm, superkerr.f90, amodules.f90 and all .mod files
• superkerr.f90 contains the actual fortran implementation of the model
• See https://heasarc.gsfc.nasa.gov/xanadu/xspec/manual/XSappendixLocal.html for more information on how to load the model into XSPEC
• For any questions about the model, please email andrew.mummery@physics.ox.ac.uk