fiesta.properties

This module contains functions for calculating physical properties such as number density, sound speed, Jeans mass, Mach number, and more.

Functions

calc_chem_density(chem, ndens[, unit])	Calculates chemical densities \(n_\mathrm{HI}\), \(n_\mathrm{H^+}\), \(n_\mathrm{H_2}\), \(n_\mathrm{CO}\), \(n_\mathrm{tot}\).
calc_free_fall_time(ndens[, unit])	Calculates free-fall time using \(t_\mathrm{ff} = 2 \times 10^6 \big(\frac{n}{1000~\mathrm{cm}^{-3}}\big)^{-0.5} ~\mathrm{yrs}\).
calc_jeans_length(cs, ndens[, unit])	Calculates Jeans length using \(\lambda_\mathrm{J} = 0.4 \big(\frac{c_s}{2~\mathrm{km/s}}\big) \big(\frac{n}{1000~\mathrm{cm}^{-3}}\big)^{-0.5} ~\mathrm{pc}\).
calc_jeans_mass(cs, ndens[, unit])	Calculates Jeans mass using \(M_\mathrm{J} = 2 \big(\frac{c_s}{2~\mathrm{km/s}}\big)^3 \big(\frac{n}{1000~\mathrm{cm}^{-3}}\big)^{-0.5} ~\mathrm{M}_\odot\).
calc_mach_numbers(vel, cs)	Calculates Mach numbers using \(\mathcal{M} = \frac{\sigma_v}{c_\mathrm{s}}\).
calc_molecular_weight(chem)	Calculates molecular weight using \(\mathrm{molw} = \frac{1 - 4 x_\mathrm{He}}{1+x_\mathrm{He}-x_\mathrm{H_2}+x_\mathrm{H^+}}\).
calc_number_density(rho[, unit])	Calculates number density using \(n = \frac{\rho}{(1+4x_\mathrm{He})m_\mathrm{p}}\).
calc_sound_speed(temp, molw[, unit])	Calculates sound speed using \(c_\mathrm{s} = 10^{-5} \sqrt{\frac{k_\mathrm{b}T}{\mathrm{molw}\times m_\mathrm{p}}} ~\mathrm{km/s}\).
calc_temperature(rho, utherm, nTOT[, unit])	Calculates temperature using \(T = \frac{2}{3}\frac{u_\mathrm{therm} m_\mathrm{avg} m_\mathrm{p}}{k_\mathrm{b}}\).
calc_total_gravitational_potential_energy(...)	Calculates gravitational potential energy using \(E_\mathrm{grav} = \frac{3}{5}\frac{GM^2}{R}\).
calc_total_kinetic_energy(mass, vel[, unit])	Calculates kinetic energy using \(E_\mathrm{kin} = \sum_{i} \frac{1}{2}m_i v_i^2\).
calc_total_thermal_energy(utherm, mass[, unit])	Calculates thermal energy using \(E_\mathrm{therm} = \sum_{i} u_\mathrm{i,therm} m_i\).