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Fig. 2


X-ray and optical images of the 44 C-GOALS sample galaxies. X-ray (0.4–7 keV) brightness contours (magenta) are overlaid on the HST-ACS F814W image (grey scale) for each object. The orientation of all images is north up and east to the left. Eleven contour levels are defined in the fixed surface brightness range 4 × 10-5−7 × 10-3 [counts s-1 arcsec-2], which is divided into ten equal logarithmic intervals. For majority of objects, these contour levels were applied. For nine objects (F10173+0828, F17132+5313, F19297–0406, CGCG 448-020, F01364–1042, IRAS 21101+5810, F10565+2448, UGC 9913, and UGC 5101), a further lower interval was added to outline lower surface brightness features. For four bright objects, (UGC 8696, NGC 3690, F05189–2524 and UGC 8058), custom contour levels were made for describing their X-ray morphology – these are listed in Table 4.

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