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(A) The growth rate Ω versus the wavenumber k0 when U and Λ vary at fixed values: α = N0 = 1 and σ = 10−3. Note that the chemotactic flux (proportional to Λ) is destabilizing contrary to the advective one, proportional to U. (B) Selected wavenumber k0 versus the front velocity U for σ = 10−3, N0 = 1 and α is varied from 3 to 0.1. (C): α is fixed to 0.5, N0 varies from 3 to 0.1.
