CHANG-ES - XIV. Cosmic-ray propagation and magnetic field strengths in the radio halo of NGC 4631

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Volume 632 (December 2019)

A&A, 632 (2019) A10

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Table 8.

Cooling timescales for CREs due to synchrotron (τ_syn), inverse-Compton (τ_IC), ionization (τ_ion) and bremsstrahlung (τ_brem) losses in different regions within NGC 4631 at ν = 5.99 GHz.

Region	Central region	Disk ^(a)	Halo
B_eq, ⊥ [μG]	9.4	6.4	5.5
E [GeV]	6.3	7.6	8.2
⟨n⟩ [cm⁻³]	1.5	0.8	0.02
τ_syn [yr]	1.5 × 10⁷	2.7 × 10⁷	3.3 × 10⁷
τ_IC [yr]	2.7 × 10⁷	1.4 × 10⁸	1.2 × 10⁸
τ_ion [yr]	3.6 × 10⁸	7.9 × 10⁸	3.2 × 10¹⁰
τ_brem [yr]	2.6 × 10⁷	4.9 × 10⁷	2.0 × 10⁹

Notes. The strength of the total magnetic field perpendicular to the LOS (B_eq, ⊥), the energy (E) of the CREs, and the average number density of neutral gas (⟨n⟩) are also included. The shortest timescales, indicating the dominant loss process, are marked in bold.

^(a)

Excluding the central region.

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