Last modified: December 2018

URL: http://cxc.harvard.edu/sherpa/ahelp/xsnsatmos.html
AHELP for CIAO 4.11 Sherpa v1

xsnsatmos

Context: models

Synopsis

The XSPEC nsatmos model: NS Hydrogen Atmosphere model with electron conduction and self-irradiation.

Syntax

xsnsatmos

The xsnsatmos model is an additive model component.

Description

The model is described at [1] .


Example

>>> create_model_component("xsnsatmos", "mdl")
>>> print(mdl)

Create a component of the xsnsatmos model and display its default parameters. The output is:

mdl
   Param        Type          Value          Min          Max      Units
   -----        ----          -----          ---          ---      -----
   mdl.LogT_eff thawed            6            5          6.5          K
   mdl.M_ns     thawed          1.4          0.5            3       Msun
   mdl.R_ns     thawed           10            5           30         km
   mdl.dist     thawed           10          0.1          100        kpc
   mdl.norm     thawed            1            0        1e+24           

ATTRIBUTES

The attributes for this object are:

LogT_eff

The log of Teff, the unredshifted effective temperature.

M_ns

The neutron star gravitational mass, in units of the solar mass.

R_ns

The "true" neutron star radius, in km.

dist

The distance to the neutron star, in kpc.

norm

The fraction of the neutron star surface emitting.

References

XSPEC version

CIAO 4.11 comes with support for version 12.10.0e of the XSPEC models. This can be checked with the following:

% python -c 'from sherpa.astro import xspec;
print(xspec.get_xsversion())'
12.10.0e

Bugs

See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.