Searching for redshifted 2.2 MeV neutron-capture lines from accreting neutron stars: Theoretical X-ray luminosity requirements and INTEGRAL/SPI observations

Open Access

Fig. 4.

3σ upper limits of the γ-ray flux in the 2.2 MeV line (assuming FWHM = 10 keV) from the targets considered here, as a function of their X-ray luminosity. The solid and dashed lines show the line intensities expected from Eqs. (4) and (5).

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