tvt: The tensor virial theorem

In oczoske/slacR: R-package to measure v and sigma from VIMOS IFU cubes

Description

These functions provide theoretical values and plots related to the tensor virial theorem. v.sig.2d and v.sig.1d compute <v/sigma> as a function of ellipticity and anisotropy delta as appropriate for two-dimensional and one-dimensional kinematic data, respectively. v.sig.eps.plot creates a plot to which data points can be added.

Usage

v.sig.2d(epsilon, delta = 0, alpha = 0.15)
v.sig.1d(epsilon, delta = 0)
delta.anisotropy(epsilon, V.sigma, alpha = 0.15)
Wxx.Wzz(epsilon)
v.sig.eps.plot(eps.data = NULL, vsig.data = NULL, twoD = TRUE, xlim,
ylim, ...)

Arguments

epsilon	axis ratio, epsilon = b/a
delta	the anisotropy parameter
alpha	parameter required to compute the two-dimensional <v/sigma>; default value is as given by Binney (2005).
V.sigma	<v/sigma>, computed from two-dimensional data
eps.data,vsig.data	vectors containing ellipticities and <v/sigma> values derived from data; these will be added to the plot as points
twoD	logical: Plot <v/sigma> curves for one-dimensional or two-dimensional data?
xlim,ylim	plot limits. If not present, these will take default values or will be derived from the data points.
...	parameters passed to other methods; in particular, these can be used to specify point types for plotting the data points.

Value

All functions return numbers, except v.sig.eps.plot, which returns nothing.

Author(s)

Oliver Czoske

References

Binney, J.: “On the rotation of elliptical galaxies”, MNRAS 183, 501 (1978); Binney, J.: “Rotation and anisotropy of galaxies revisited”, MNRAS 363, 937 (2005)

See Also

binney, lambdaR

Examples

## Not run: v.sig.eps.plot()

oczoske/slacR documentation built on May 20, 2019, 8:23 p.m.