README.rst

XARS X-ray Monte-carlo simulator

XARS simulates X-rays passing through matter in user-defined geometries.

Photo-electric absorption, compton scattering and fluorescent line processes are modelled.

Usage

see Code Documentation

How to cite XARS correctly

Please reference Buchner et al (2019), A&A, 629, A16, 14pp.

Models

In Buchner+19 we irradiated the following geometries, and you can download xspec table models here for them. See the paper for description of the parameters and model assumptions.

Each of these models also has a infrared model associated with it.

UXCLUMPY

The Unified X-ray Clumpy model (UXCLUMPY) features:

• Unification: Can produce unobscured, obscured and Compton-thick AGN in the right proportions.
• Eclipse events: The frequency and sizes of eclipses are reproduced by clumps on Keplerian orbits.
• X-ray spectra can fit observations well
• Compatible with CLUMPY infrared models

Here you can access:

• Geometry movies: https://vimeo.com/218031864 and 360 VR https://vimeo.com/253036759
• X-ray table model available at: UXCLUMPY page
• Infrared model available at: https://clumpy.org
• More information: Buchner et al. 2019 (or send me an email)

Warped disk

A simple warped disk geometry

• Geometry images: Warped Disk page
• X-ray table model available at: Warped Disk page
• Infrared model: see Jud et al (2017)
• More information: Buchner et al. (2021)

Radiative fountain (Wada 2012)

• Geometry images: Radiative fountain page
• X-ray table model available at: Radiative fountain page
• Infrared model: Radiative fountain page
• More information: Buchner et al. (2021)

CAT3D-WIND

• Infrared model: https://www.sungrazer.org/cat3d.html
• X-ray model: CAT3D+WIND page

Response of a single spherical blob

Reflection from a single sphere with

• Isotropic density
• Exponential density profile
• Gaussian density profile

Spectrum gives

• Angle-averaged reflection off a blob with uniform, gaussian or exponentialdensity profile.
• Parameters: Photon index, Energy cut-off, NH across the blob.
• Files: blob_uniform.fits, blob_gaussian.fits, blob_exponential.fits

Download:

• X-ray table model: https://doi.org/10.5281/zenodo.2235456
• Infrared model: https://en.wikipedia.org/wiki/Planck%27s_law

More information in the appendix of Buchner et al. 2019.

Wedge model

Download from: https://doi.org/10.5281/zenodo.2224650

• Single wedge
  • Sphere with bi-conical cut-out (see also BORUS02; Buchner et al., submitted)
  • Parameters: Photon index, Energy cut-off, Torus Opening angle, Viewing angle.
• Gradient wedge model
  • Sphere with bi-conical cut-out, but gradually increasing density (see Buchner et al., submitted)
  • Parameters: Photon index, Energy cut-off, Torus Opening angle, Viewing angle.
  • Files: gradientwedge.fits gradientwedge-reflect.fits gradientwedge-reflect.fits

Disk

• Infinitely thick disk (similar to pexrav or pexmon, put self-consistently computed with XARS)
• Parameters: Photon index, Energy cut-off, viewing angle.
• Download link: https://doi.org/10.5281/zenodo.2224471
• Files: disk.fits diskreflect.fits disktransmit.fits

Presented in Buchner et al. 2019.

Clumpybox3

• crate of spheres, just touching each other
• With many free parameters; useful for exploring clumpy geometries
• Geometry parameters:
  • NH through the spheres (mean and variance across the spheres),
  • filling: 1 if spheres are just touching (like in the illustration), otherwise radii are smaller by that factor.
• Parameters: Photon index, Energy cut-off, LOS NH, Inclination angle
• Download link: https://doi.org/10.5281/zenodo.2245188
• clumpy/clumpybox3.fits

Other torus models

• a constant-density donut-shaped geometry, 60° opening angle: MYTORUS and also RXTorus.
• Another cone-cutout geometry e-torus (logNH=22-25 range only)
• Clumps in a donut outline Ctorus (logNH=22-25, E=1-450keV only)