A candidate proton cyclotron resonant scattering feature at 1.89 keV is detected in NGC 4861 X-2, implying B ~ (3-4) x 10^14 G.
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A candidate cyclotron line at 1.89 keV in the ultraluminous X-ray source NGC 4861 X-2
A candidate proton cyclotron resonant scattering feature at 1.89 keV is detected in NGC 4861 X-2, implying B ~ (3-4) x 10^14 G.