DeVaucouleurs2D¶
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class
sherpa.astro.models.
DeVaucouleurs2D
(name='devaucouleurs2d')[source]¶ 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 withn=4
, as described in [2], [3], and [4].-
r0
¶ The core radius.
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xpos
¶ The center of the model on the x0 axis.
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ypos
¶ The center of the model on the x1 axis.
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ellip
¶ The ellipticity of the model.
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theta
¶ The angle of the major axis. It is in radians, measured counter-clockwise from the X0 axis (i.e. the line X1=0).
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ampl
¶ The amplitude refers to the maximum peak of the model.
See also
Notes
The model used is the same as the
Sersic2D
model withn=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
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thawedparhardmaxes
¶
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thawedparhardmins
¶
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thawedparmaxes
¶
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thawedparmins
¶
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thawedpars
¶
Methods Documentation
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apply
(outer, *otherargs, **otherkwargs)¶
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reset
()¶
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startup
()¶
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teardown
()¶
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