Supernova Remnant Models

Plot the evolution of radius of the SNR:

"""Plot SNR radius evolution versus time."""
import numpy as np
import matplotlib.pyplot as plt
from astropy.units import Quantity
from gammapy.astro.source import SNR, SNRTrueloveMcKee

snr_models = [SNR, SNRTrueloveMcKee]
densities = Quantity([1, 0.1], 'cm^-3')
linestyles = ['-', '--']
t = Quantity(np.logspace(0, 5, 100), 'yr')

for density in densities:
    for linestyle, snr_model in zip(linestyles, snr_models):
        snr = snr_model(n_ISM=density)
        label = snr.__class__.__name__ + ' (n_ISM = {0})'.format(density.value)
        x = t.value
        y = snr.radius(t).to('pc').value
        plt.plot(x, y, label=label, linestyle=linestyle)

plt.xlabel('time [years]')
plt.ylabel('radius [pc]')
plt.legend(loc=4)
plt.loglog()
plt.show()

(png, hires.png, pdf)

Plot the evolution of the flux of the SNR above 1 TeV and at 1 kpc distance:

"""Plot SNR brightness evolution."""
import numpy as np
import matplotlib.pyplot as plt
from astropy.units import Quantity
from gammapy.astro.source import SNR

densities = Quantity([1, 0.1], 'cm-3')
t = Quantity(np.logspace(0, 5, 100), 'yr')

for density in densities:
    snr = SNR(n_ISM=density)
    F = snr.luminosity_tev(t) / (4 * np.pi * Quantity(1, 'kpc') ** 2)
    plt.plot(t.value, F.to('cm-2 s-1').value, label='n_ISM = {0}'.format(density.value))
    plt.vlines(snr.sedov_taylor_begin.to('yr').value, 1E-13, 1E-10, linestyle='--')
    plt.vlines(snr.sedov_taylor_end.to('yr').value, 1E-13, 1E-10, linestyle='--')

plt.xlim(1E2, 1E5)
plt.ylim(1E-13, 1E-10)
plt.xlabel('time [years]')
plt.ylabel('flux @ 1kpc [s^-1 cm^-2]')
plt.legend(loc=4)
plt.loglog()
plt.show()

(png, hires.png, pdf)