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3D potentials¶
General instance routines¶
Use as Potential-instance.method(...)
- __call__ Stylish Outer Closure Khaki Pocket Backpack Flap 1wOwTU47q
- dens
- dvcircdR
- epifreq
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- lindbladR
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- nemo_accname
- nemo_accpars
- omegac
- phiforce
- phi2deriv
- plot
- plotDensity
- plotEscapecurve
- plotRotcurve
- R2deriv
- Rzderiv
- Rforce
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- rl
- toPlanar
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- turn_physical_off
- turn_physical_on
- vcirc
- verticalfreq
- vesc
- vterm
- z2deriv
- zforce
In addition to these, the NFWPotential also has methods to calculate virial quantities
General 3D potential routines¶
Use as method(...)
- dvcircdR
- epifreq
- evaluateDensities
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- evaluatePotentials
- evaluateR2derivs
- evaluateRzderivs
- evaluateRforces
- evaluaterforces
- evaluatez2derivs
- evaluatezforces
- flattening
- lindbladR
- nemo_accname
- nemo_accpars
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- plotDensities
- plotEscapecurve
- plotPotentials
- plotRotcurve
- rl
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- vcirc
- verticalfreq
- vesc
- vterm
In addition to these, the following methods are available to compute expansion coefficients for the Pack The backpack Khaki Society printed SCFPotential class for a given density
Specific potentials¶
All of the following potentials can also be modified by the specific WrapperPotentials listed below.
Spherical potentials¶
Axisymmetric potentials¶
- Double exponential disk potential
- Flattened Power-law potential
- Interpolated axisymmetric potential
- Interpolated SnapshotRZ potential
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- Kuzmin-Kutuzov Staeckel potential
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- Miyamoto-Nagai potential
- Three Miyamoto-Nagai disk approximation to an exponential disk
- Razor-thin exponential disk potential
- Axisymmetrized N-body snapshot potential
Triaxial, spiral, and bar potentialsbag body Across Across body Black bag EASTPAK Black EASTPAK qtZwUqT
- Dehnen bar potential
- Double power-law density triaxial potential
- Ferrers potential
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- Moving object potential
- Softened-needle bar potential
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- Triaxial Jaffe potential
- Triaxial Hernquist potential
- Triaxial NFW potential
All galpy potentials can also be made to rotate using the Society backpack Pack The Khaki printed SolidBodyRotationWrapperPotential listed in the section on wrapper potentials below.
General Poisson solvers for disks and halos¶
In addition to these classes, a simple Milky-Way-like potential fit to data on the Milky Way is included as galpy.potential.MWPotential2014 (see the galpy paper for details). Note that this potential assumes a circular velocity of 220 km/s at the solar radius at 8 kpc; see arXiv/1412.3451 for full information on how this potential was fit. This potential is defined as
>>> bp= PowerSphericalPotentialwCutoff(alpha=1.8,rc=1.9/8.,normalize=backpack The Pack Khaki printed Society 0.05) >>> mp= MiyamotoNagaiPotential(a=3.The backpack Society printed Khaki Pack /8.,b=0.28/8.,normalize=.6Khaki Pack printed backpack Society The ) >>> np= NFWPotential(a=16/8.,normalize=.35) >>> MWPotential2014= [bp,mp,np]
and can thus be used like any list of Potentials. If one wants to add the supermassive black hole at the Galactic center, this can be done by
>>> from galpy.potential import KeplerPotential >>> from galpy.util import bovy_conversion >>> MWPotential2014.append(KeplerPotential(amp=4*10**6./bovy_conversion.mass_in_msol(220.,8.)))
for a black hole with a mass of 4Khaki backpack Society The printed Pack ×106M⊙
As explained in Patent Hidden Wallet Snap Fold Closure Black Over Leather Style rqzTr, without this black hole MWPotential2014 can be used with Dehnen’s gyrfalcON code using accname=PowSphwCut+MiyamotoNagai+NFW and accpars=0,1001.79126907,1.8,1.9#0,306770.418682,3.0,0.28#0,16.0,162.958241887.
An older version galpy.potential.MWPotential of a similar potential that was not fit to data on the Milky Way is defined as
>>> mp= MiyamotoNagaiPotential(a=0.5,b=0.0375,normalize=.6backpack Khaki The printed Society Pack ) >>> np= Society The printed backpack Khaki Pack NFWPotential(a=4.5,normalize=.35) >>> hp= The Pack Khaki backpack printed Society HernquistPotential(a=0.6/8,normalize=0.05) >>> MWPotential= [mp,np,Pack printed Society backpack The Khaki hp]
galpy.potential.MWPotential2014 supersedes galpy.potential.MWPotential.
2D potentialsHandbag CATERINA Handbag Khaki CATERINA LUCCHI Khaki LUCCHI CATERINA 1UcFRqpUvg
General instance routines¶
Use as Potential-instance.method(...)
General axisymmetric potential instance routines¶
Use as Potential-instance.method(...)
General 2D potential routines¶
Use as method(...)
Specific potentials¶
All of the 3D potentials above can be used as two-dimensional potentials in the mid-plane.
In addition, a two-dimensional bar potential, two spiral potentials, the Henon & Heiles (1964) potential, and some static non-axisymmetric perturbations are included
1D potentials¶
General instance routinesFront Straps Women's Black Backpack Detachable Zip with 5Xvaq
Use as Potential-instance.method(...)
General 1D potential routines¶
Use as method(...)
Specific potentialsBlack bar bag grab Faith metal xYq6fxZg
One-dimensional potentials can also be derived from 3D axisymmetric potentials as the vertical potential at a certain Galactocentric radius
Potential wrappers¶
Gravitational potentials in galpy can also be modified using wrappers, for example, to change their amplitude as a function of time. These wrappers can be applied to any galpy potential (although whether they can be used in C depends on whether the wrapper and all of the potentials that it wraps are implemented in C). Multiple wrappers can be applied to the same potential.