Bounds from cosmology and astrophysics on the axion mass. The constraint from HMF in the local group with the halos of nearby dwarf irregulars (dIrrs) from the LTs catalog is displayed with dark turquoise bars. On the dIrrs bar, we also show the optimal mass eV (uncertainties at 2σ CL). Our constraints are compared to other cosmological and astrophysical limits (see main text for details).