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Deep NuSTAR observation of X-ray pulsar A 0535+262, performed at a very lowluminosity of $\sim7\times10^{34}$ erg s$^{-1}$, revealed the presence of twospectral components. We argue that the high-energy component is associated withcyclotron emission from recombination of electrons collisionally excited to theupper Landau levels. The cyclotron line energy of $E_{\rm cyc}=47.7\pm0.8$ keVwas measured at the luminosity of almost an order of magnitude lower than whatwas achieved before. The data firmly exclude a positive correlation of thecyclotron energy with the mass accretion rate in this source.

Cyclotron emission, absorption, and the two faces of X-ray pulsar A 0535+262