VCG04¶
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class
dust_extinction.parameter_averages.
VCG04
(Rv=3.1, **kwargs)[source]¶ Bases:
dust_extinction.baseclasses.BaseExtRvModel
VCG04 extinction model calculation
Parameters: - Rv: float
R(V) = A(V)/E(B-V) = total-to-selective extinction
Raises: - InputParameterError
Input Rv values outside of defined range
Notes
VCG04 Milky Way R(V) dependent extinction model From Valencic, Clayton, & Gordon (2004, ApJ, 616, 912) Including erratum: 2014, ApJ, 793, 66
This model applies to the UV spectral region all the way to 912 A. This model was not derived for the optical or NIR.
Example showing V04 curves for a range of R(V) values.
import numpy as np import matplotlib.pyplot as plt import astropy.units as u from dust_extinction.parameter_averages import VCG04 fig, ax = plt.subplots() # generate the curves and plot them x = np.arange(3.3,8.0, 0.1)/u.micron Rvs = ['2.0','3.0','4.0','5.0','6.0'] for cur_Rv in Rvs: ext_model = VCG04(Rv=cur_Rv) ax.plot(x,ext_model(x),label='R(V) = ' + str(cur_Rv)) ax.set_xlabel(r'$x$ [$\mu m^{-1}$]') ax.set_ylabel(r'$A(x)/A(V)$') ax.legend(loc='best') plt.show()
(Source code, png, hires.png, pdf)
Attributes Summary
Rv_range
param_names
x_range
Methods Summary
evaluate
(in_x, Rv)VCG04 function Attributes Documentation
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Rv_range
= [2.0, 6.0]¶
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param_names
= ('Rv',)¶
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x_range
= [3.3, 8.0]¶
Methods Documentation
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static
evaluate
(in_x, Rv)[source]¶ VCG04 function
Parameters: - in_x: float
expects either x in units of wavelengths or frequency or assumes wavelengths in wavenumbers [1/micron] internally wavenumbers are used
Returns: - axav: np array (float)
A(x)/A(V) extinction curve [mag]
Raises: - ValueError
Input x values outside of defined range