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Fig. 5.


Flux-duration distribution of the X-ray flares from Sgr A* in a log-log diagram. Top left panel: flare flux-duration distribution observed with XMM-Newton and Chandra from 1999 to 2015 (black dots) and from 2016 to 2018 (orange dots). The flares beginning before or ending after the GTIs are not represented. The blue lines are the corresponding Delaunay triangles. The red lines define the convex hull. Top right panel: observed flare density distribution. The color bar of the filled contours is represented in the right-hand side of the figure in units of 1010 s−1 erg−1 s cm2. Bottom left panel: merged detection efficiency for XMM-Newton and Chandra from 1999 to 2018 in percent. The dots show the simulation grid. Bottom right panel: intrinsic flare density distribution corrected for the observing bias computed on the same grid as in the bottom left panel. The filled contours use the same scale as in the top right panel.

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