# hyperion.dust.HenyeyGreensteinDust¶

class `hyperion.dust.``HenyeyGreensteinDust`(nu, albedo, chi, g, p_lin_max)

This class should be used for dust properties that include scattering parameterized by the Henyey-Greenstein, 1941 function. The dust properties should be instatiated as:

```d = HenyeyGreensteinDust(nu, albedo, chi, g, p_lin_max)
```

where `nu`, `albedo`, and `chi` are 1-D Numpy arrays containing the frequencies, albedo, and opacity to extinction respectively, and `g` and `p_lin_max` are also 1-D Numpy arrays containing the asymmetry parameter and the maximum linear polarization.

Method

 `set_sublimation_temperature`(mode[, temperature]) Set the dust sublimation mode and temperature. `set_sublimation_specific_energy`(mode[, …]) Set the dust sublimation mode and specific energy. `set_lte_emissivities`([n_temp, temp_min, …]) Calculate the emissivities assuming LTE `plot`(filename) `read`(filename) Read in from a standard dust file `write`(filename[, compression]) Write out to a standard dust file, including calculations of the mean opacities and optionally thermal emissivities. `temperature2specific_energy`(temperature) Convert a temperature to its corresponding specific energy value. `specific_energy2temperature`(specific_energy) Convert a specific energy value to its corresponding temperature. `chi_nu_temperature`(temperature) Compute the mean opacity to extinction for a blackbody at a given temperature. `kappa_nu_temperature`(temperature) Compute the mean opacity to absorption for a blackbody at a given temperature. `chi_nu_spectrum`(nu, fnu) Compute the mean opacity to extinction for a given spectrum. `kappa_nu_spectrum`(nu, fnu) Compute the mean opacity to absorption for a given spectrum.

Methods (detail)

`set_sublimation_temperature`(mode, temperature=0.0)

Set the dust sublimation mode and temperature.

Parameters: mode : str The dust sublimation mode, which can be: ‘no’ - no sublimation ‘fast’ - remove all dust in cells exceeding the sublimation temperature ‘slow’ - reduce the dust in cells exceeding the sublimation temperature ‘cap’ - any temperature exceeding the sublimation temperature is reset to the sublimation temperature. temperature : float, optional The dust sublimation temperature, in K
`set_sublimation_specific_energy`(mode, specific_energy=0.0)

Set the dust sublimation mode and specific energy.

Parameters: mode : str The dust sublimation mode, which can be: ‘no’ - no sublimation ‘fast’ - remove all dust in cells exceeding the sublimation specific energy ‘slow’ - reduce the dust in cells exceeding the sublimation specific energy ‘cap’ - any specific energy exceeding the sublimation specific energy is reset to the sublimation specific energy. specific_energy : float, optional The dust sublimation specific energy, in cgs
`set_lte_emissivities`(n_temp=1200, temp_min=0.1, temp_max=100000.0)

Calculate the emissivities assuming LTE

Parameters: n_temp : int, optional The number of temperatures to calculate the emissivities for temp_min : float, optional The minimum temperature to calculate the emissivities for temp_max : float, optional The maximum temperature to calculate the emissivities for
`plot`(filename)
`read`(filename)

Read in from a standard dust file

`write`(filename, compression=True)

Write out to a standard dust file, including calculations of the mean opacities and optionally thermal emissivities.

`temperature2specific_energy`(temperature)

Convert a temperature to its corresponding specific energy value.

Parameters: temperature : float or array_like The temperature to convert specific_energy : float or array_like The specific energy corresponding to the input temperature
`specific_energy2temperature`(specific_energy)

Convert a specific energy value to its corresponding temperature.

Parameters: specific_energy : float or array_like The specific energy to convert temperature : float or array_like The temperature corresponding to the input specific energy
`chi_nu_temperature`(temperature)

Compute the mean opacity to extinction for a blackbody at a given temperature.

Parameters: temperature : float The temperature of the blackbody to use chi_nu_mean : float The mean opacity to extinction
`kappa_nu_temperature`(temperature)

Compute the mean opacity to absorption for a blackbody at a given temperature.

Parameters: temperature : float The temperature of the blackbody to use kappa_nu_mean : float The mean opacity to absorption
`chi_nu_spectrum`(nu, fnu)

Compute the mean opacity to extinction for a given spectrum.

Parameters: nu : array_like The frequencies, in Hz fnu : array_like The monochromatic fluxes per unit frequency. Units are unimportant since proportionality constants are cancelled out in the computation. chi_nu_mean : float The mean opacity to extinction
`kappa_nu_spectrum`(nu, fnu)

Compute the mean opacity to absorption for a given spectrum.

Parameters: nu : array_like The frequencies, in Hz fnu : array_like The monochromatic fluxes per unit frequency. Units are unimportant since proportionality constants are cancelled out in the computation. kappa_nu_mean : float The mean opacity to absorption