DeVaucouleurs2D

class sherpa.astro.models.DeVaucouleurs2D(name='devaucouleurs2d')

Bases: sherpa.models.model.ArithmeticModel

Two-dimensional de Vaucouleurs model.

This is a formulation of the R^(1/4) law introduced by [1]. It is a special case of the Sersic2D model with n=4, as described in [2], [3], and [4].

r0

The core radius.

xpos

The center of the model on the x0 axis.

ypos

The center of the model on the x1 axis.

ellip

The ellipticity of the model.

theta

The angle of the major axis. It is in radians, measured counter-clockwise from the X0 axis (i.e. the line X1=0).

ampl

The amplitude refers to the maximum peak of the model.

See also

Beta2D, HubbleReynolds, Lorentz2D, Sersic2D

Notes

The model used is the same as the Sersic2D model with n=4.

References

[1]	de Vaucouleurs G., 1948, Ann. d’Astroph. 11, 247 http://adsabs.harvard.edu/abs/1948AnAp...11..247D

[2]	http://ned.ipac.caltech.edu/level5/March05/Graham/Graham2.html

[3]	Graham, A. & Driver, S., 2005, PASA, 22, 118 http://adsabs.harvard.edu/abs/2005PASA...22..118G

[4]	Ciotti, L. & Bertin, G., A&A, 1999, 352, 447-451 http://adsabs.harvard.edu/abs/1999A%26A...352..447C

Attributes Summary

thawedparhardmaxes
thawedparhardmins
thawedparmaxes
thawedparmins
thawedpars

Methods Summary

apply(outer, \*otherargs, \*\*otherkwargs)
calc(\*args, \*\*kwargs)
get_center()
guess(dep, \*args, \*\*kwargs)
reset()
set_center(xpos, ypos, \*args, \*\*kwargs)
startup()
teardown()

Attributes Documentation

thawedparhardmaxes

thawedparhardmins

thawedparmaxes

thawedparmins

thawedpars

Methods Documentation

apply(outer, *otherargs, **otherkwargs)

calc(*args, **kwargs)

get_center()

guess(dep, *args, **kwargs)

reset()

set_center(xpos, ypos, *args, **kwargs)

startup()

teardown()