Flux-duration distribution of the X-ray flares from Sgr A*. Top left panel: the observed flare flux–duration distribution observed with XMM-Newton and Chandra from 1999 to 2015 (black dots) using a false positive rate for the flare detection of 0.1%. The blue lines are the corresponding Delaunay triangles. The red lines define the convex hull. Top right panel: the observed flare density distribution is shown. The filled contours are indicated in logarithmic scale and the corresponding color bar is represented in the right-hand side of the figure in unit of 1010 s-1 erg-1 s cm2. Bottom left panel: the merged detection efficiency with a false positive rate for the flare detection of 0.1% for XMM-Newton and Chandra from 1999 to 2015 in percent. The dots represent the simulation grid. Bottom right panel: the intrinsic flare density distribution corrected from the observing bias is shown. The filled contours use the same logarithmic scale as in the top right panel.
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