Extended Data Fig. 3: Upper limits on the quiescent X-ray luminosity as derived by XMM-Newton.
From: Detection of X-ray emission from a bright long-period radio transient
The 3σ X-ray luminosity limits are calculated as a function of photon index (Γ; panel a) and black body temperature (kT; panel b). We assume NH = 1.8 × 1022 cm−2, which is the Galactic column density in the direction of the source, consistent with the X-ray spectral fits during the outburst. The shaded region assumes the error in the distance (\({4.5}_{-0.5}^{+1.2}\) kpc).
