SNRTrueloveMcKee¶
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class
gammapy.astro.source.
SNRTrueloveMcKee
(*args, **kwargs)[source]¶ Bases:
gammapy.astro.source.SNR
SNR model according to Truelove & McKee (1999).
Reference: https://ui.adsabs.harvard.edu/abs/1999ApJS..120..299T
Attributes Summary
Characteristic time scale when the Sedov-Taylor phase starts.
Characteristic time scale when the Sedov-Taylor phase of the SNR’s evolution ends.
Methods Summary
luminosity_tev
(t[, energy_min])Gamma-ray luminosity above
energy_min
at aget
.radius
(t)Outer shell radius at age t.
radius_inner
(t[, fraction])Inner radius at age t of the SNR shell.
Reverse shock radius at age t.
Attributes Documentation
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sedov_taylor_begin
¶ Characteristic time scale when the Sedov-Taylor phase starts.
Given by tST≈0.52tch.
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sedov_taylor_end
¶ Characteristic time scale when the Sedov-Taylor phase of the SNR’s evolution ends.
The end of the Sedov-Taylor phase of the SNR is defined by the condition, that the temperature at the shock drops below T = 10^6 K.
The time scale is given by:
tend≈43000(m1.66⋅10−24g)5/6(ESN1051erg)1/3(ρISM1.66⋅10−24g/cm3)−1/3yr
Methods Documentation
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luminosity_tev
(t, energy_min='1 TeV')¶ Gamma-ray luminosity above
energy_min
at aget
.The luminosity is assumed constant in a given age interval and zero before and after. The assumed spectral index is 2.1.
The gamma-ray luminosity above 1 TeV is given by:
Lγ(≥1TeV)≈1034θ(ESN1051erg)(ρISM1.66⋅10−24g/cm3) s−1Reference: https://ui.adsabs.harvard.edu/abs/1994A%26A…287..959D (Formula (7)).
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radius
(t)[source]¶ Outer shell radius at age t.
The radius during the free expansion phase is given by:
RSNR(t)=1.12Rch(ttch)2/3The radius during the Sedov-Taylor phase evolves like:
RSNR(t)=[R5/2SNR,ST+(2.026ESNρISM)1/2(t−tST)]2/5Using the characteristic dimensions:
Rch=M1/3ejρ−1/3ISM and tch=E−1/2SNM5/6ejρ−1/3ISM- Parameters
- t
Quantity
Time after birth of the SNR
- t
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radius_inner
(t, fraction=0.0914)¶ Inner radius at age t of the SNR shell.
- Parameters
- t
Quantity
Time after birth of the SNR
- t
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radius_reverse_shock
(t)[source]¶ Reverse shock radius at age t.
Initially the reverse shock co-evolves with the radius of the SNR:
RRS(t)=11.19rSNR(t)After a time tcore≃0.25tch the reverse shock reaches the core and then propagates as:
RRS(t)=[1.49−0.16t−tcoretch−0.46ln(ttcore)]Rchtcht- Parameters
- t
Quantity
Time after birth of the SNR
- t
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