Fig. 1.
(a) Difference image between 2003 and 2015 in the 4–6 keV band. The green box corresponds to the region shown in panels (b), (c), and (d). (b) Zoom-in view of the yellow box in panel (a). (c) Same as panel (b) but with guides for identification of notable features overlaid. (d) Exposure-corrected Chandra ACIS images of Tycho’s SNR in 2003, 2007, 2009, and 2015. The energy band is 4–6 keV. The regions S1–S9 and R1–R5 are those for the spectral analysis. The Ref region is used for estimating the parameters for the thermal component of the emissions of the stripes. In all the panels, the unit for the color scale is 10−8 ph s−1 cm−2. (Color online)
