Spinning Dust Emission from Wobbling Grains: Important Physical Effects and Implications

Figure 2

Normalized power spectrum of a torque-free rotating irregular grain with 𝐼₁∶𝐼₂∶𝐼₃=1∶0.6∶0.5 for the different values of 𝑞=1.05,1.60 (i.e., 𝑞<𝑞_sp≡𝐼₁/𝐼₂) and 𝑞=1.81>𝑞_sp. The components of |FT(𝜇̈_𝑥)|²/max(|FT(𝜇̈_𝑥)|²) (or |FT(𝜇̈_𝑦)|²/max(|FT(𝜇̈_𝑥)|²) are indicated by circles, while the components of |FT(𝜇̈_𝑧)|²/max(|FT(𝜇̈_𝑥)|²) are indicated by triangles. Orders of in-plane modes 𝑚 and out-of-plane modes 𝑛 are indicated, and case 1 (𝜇₁=𝜇/√3) of 𝝁 orientation is assumed. The figure is reproduced from Hoang et al. [15].

(a)

(b)