def add_snr_parameters(table):
"""Add SNR parameters to the table.
TODO: document
"""
# Read relevant columns
age = table["age"].quantity
n_ISM = table["n_ISM"].quantity
# Compute properties
snr = SNR(n_ISM=n_ISM)
E_SN = snr.e_sn * np.ones(len(table))
r_out = snr.radius(age)
r_in = snr.radius_inner(age)
L_SNR = snr.luminosity_tev(age)
# Add columns to table
table["E_SN"] = Column(E_SN, description="SNR kinetic energy")
table["r_out"] = Column(r_out.to("pc"), description="SNR outer radius")
table["r_in"] = Column(r_in.to("pc"), description="SNR inner radius")
table["L_SNR"] = Column(L_SNR, description="SNR photon rate above 1 TeV")
return table
# Licensed under a 3-clause BSD style license - see LICENSE.rst
import numpy as np
from numpy.testing import assert_allclose
from astropy.units import Quantity
from gammapy.astro.source import SNR, SNRTrueloveMcKee
t = Quantity([0, 1, 10, 100, 1000, 10000], "yr")
snr = SNR()
snr_mckee = SNRTrueloveMcKee()
def test_SNR_luminosity_tev():
"""Test SNR luminosity"""
reference = [0, 0, 0, 0, 1.076e33, 1.076e33]
assert_allclose(snr.luminosity_tev(t).value, reference, rtol=1e-3)
def test_SNR_radius():
"""Test SNR radius"""
reference = [0, 3.085e16, 3.085e17, 3.085e18, 1.174e19, 2.950e19]
assert_allclose(snr.radius(t).value, reference, rtol=1e-3)
def test_SNR_radius_inner():
"""Test SNR radius"""
reference = (1 - 0.0914) * np.array(
[0, 3.085e16, 3.085e17, 3.085e18, 1.174e19, 2.950e19])
assert_allclose(snr.radius_inner(t).value, reference, rtol=1e-3)
def test_SNRTrueloveMcKee_luminosity_tev():
"""Plot SNR brightness evolution."""
import numpy as np
from astropy.units import Quantity
import matplotlib.pyplot as plt
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 = {}".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()
"""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')
colors = ['b', 'g']
t = Quantity(np.logspace(0, 5, 100), 'yr')
for color, density in zip(colors, densities):
snr = SNR(n_ISM=density)
F = snr.luminosity_tev(t) / (4 * np.pi * Quantity(1, 'kpc') ** 2)
plt.plot(t.value, F.to('ph s^-1 cm^-2').value, color=color, label='n_ISM = {0}'.format(density.value))
plt.vlines(snr.sedov_taylor_begin.to('yr').value, 1E-13, 1E-10, linestyle='--', color=color)
plt.vlines(snr.sedov_taylor_end.to('yr').value, 1E-13, 1E-10, linestyle='--', color=color)
plt.xlim(1E2, 1E5)
plt.ylim(1E-13, 1E-10)
plt.xlabel('time [years]')
plt.ylabel('flux @ 1kpc [ph s^-1 cm ^-2]')
plt.legend(loc=4)
plt.loglog()
plt.show()
"""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 = {}".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()