HEASoft and XSPEC are now available as conda packages. See details ....
nsmaxg: Neutron Star with a Magnetic Atmosphere
The nsmaxg model interpolates from a grid of neutron star (NS)
atmosphere spectra to produce a final spectrum that depends on the
parameters listed below. Atmosphere spectra are obtained using the
latest equation of state and opacity results for a partially ionized,
strongly magnetized hydrogen or mid-Z element plasma. Models are
constructed by solving the coupled radiative transfer equations for
the two photon polarization modes in a magnetized medium, and the
atmosphere is in radiative and hydrostatic equilibrium. Atmosphere
models mainly depend on the surface effective temperature and
magnetic field strength
and inclination
; there is also a
dependence on the surface gravity
, where
is the gravitational redshift and
and
are the
NS mass and radius, respectively.
Two sets of models are available: one set with a single surface and
[some models allow for varying
, in the range
(cm/s
) =
13.6–15.4] and a set which is constructed with
and
varying
across the surface according to the magnetic dipole model (
is the
angle between the direction to the observer and the magnetic
axis). Effective temperatures span the range
=
5.5–6.8. Models with single (
,
) cover the energy range 0.05–10
keV, while models with (
,
)-distributions cover the range 0.09–5
keV.
par1 | |
par2 | |
par3 | |
par4 | |
par5 | switch indicating model to use |
norm | 1, normalization (though not strictly correct, can be varied to
change the size of the emission region, ( |
The models available by setting par5 are:
Switch | Element | ||||||
1000 | H | 0.01 | 0 | N/A | 2.4 | 5.5 – 6.7 | 0.05 – 10 |
1060 | H | 0.04 | 0 | N/A | 0.4 – 2.5 | 5.5 – 6.7 | 0.05 – 10 |
1085 | H | 0.07 | 0 | N/A | 0.4 – 2.5 | 5.5 – 6.7 | 0.05 – 10 |
1100 | H | 0.1 | 0 | N/A | 0.4 – 2.5 | 5.5 – 6.7 | 0.05 – 10 |
1170 | H | 0.5 | 0 | N/A | 0.4 – 2.5 | 5.5 – 6.8 | 0.05 – 10 |
1185 | H | 0.71 | 0 | N/A | 2.4 | 5.5 – 6.8 | 0.05 – 10 |
1195 | H | 0.89 | 0 | N/A | 2.4 | 5.5 – 6.8 | 0.05 – 10 |
1200 | H | 1.0 | 0 | N/A | 0.4 – 2.5 | 5.5 – 6.8 | 0.05 – 10 |
1230 | H | 2.0 | 0 | N/A | 2.4 | 5.5 – 6.8 | 0.05 – 10 |
1260 | H | 4.0 | 0 | N/A | 2.4 | 5.5 – 6.8 | 0.05 – 10 |
1280 | H | 7.0 | 0 | N/A | 2.4 | 5.5 – 6.8 | 0.05 – 10 |
1300 | H | 10.0 | 0 | N/A | 0.4 – 2.5 | 5.5 – 6.8 | 0.05 – 10 |
1330 | H | 20.0 | 0 | N/A | 2.4 | 5.6 – 6.8 | 0.05 – 10 |
1350 | H | 30.0 | 0 | N/A | 2.4 | 5.7 – 6.8 | 0.05 – 10 |
1211 | H | 1.26 | 0 | N/A | 1.6 | 5.5 – 6.8 | 0.05 – 10 |
1281 | H | 7.0 | 0 | N/A | 1.6 | 5.5 – 6.8 | 0.05 – 10 |
12006 | C | 1.0 | 0 | N/A | 2.4 | 5.8 – 6.9 | 0.05 – 10 |
13006 | C | 10.0 | 0 | N/A | 2.4 | 5.8 – 6.9 | 0.05 – 10 |
12008 | O | 1.0 | 0 | N/A | 2.4 | 5.8 – 6.9 | 0.05 – 10 |
13008 | O | 10.0 | 0 | N/A | 2.4 | 5.8 – 6.9 | 0.05 – 10 |
12010 | Ne | 1.0 | 0 | N/A | 2.4 | 5.8 – 6.9 | 0.05 – 10 |
13010 | Ne | 10.0 | 0 | N/A | 2.4 | 5.8 – 6.9 | 0.05 – 10 |
123100 | H | 1.0 – 1.82 | 0-90 | 0 | 1.6 | 5.5 – 6.8 | 0.09 – 5 |
123190 | H | 1.0 – 1.82 | 0-90 | 90 | 1.6 | 5.5 – 6.8 | 0.09 – 5 |
130100 | H | 5.5 – 10.0 | 0-90 | 0 | 1.6 | 5.5 – 6.8 | 0.09 – 5 |
130190 | H | 5.5 – 10.0 | 0-90 | 90 | 1.6 | 5.5 – 6.8 | 0.09 – 5 |
If you publish results obtained using nsmaxg, please reference Ho (2014).