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Fig. 2

image

Spatial and colour distribution associated with the kinematic substructure identified in the phase space of the M 87 halo PNs. Left panel: V-band image of a 1.6×1.6 deg2 centred on M 87 from Mihos et al. (in prep.). Full circles, and diamonds indicate the spatial position of the M 87 halo PNs in the chevron substructure. Magenta and green colours indicate PN LOSVs above and below VLOS = 1254 km s-1, the LOSV at the end of the chevron. Central panel: unsharp masked image of M 87 median binned to enhance faint structures. The crown-shaped substructure is visible at distance of 800′′1200′′(~60−90 kpc) along the major axis, NW of M 87. Details are given in Sect. 3. The blue line measures 90 kpc. Right panel: (BV) colour image of M 87 from Mihos et al. (in prep.) with chevron PNs overplotted (white dots). The dashed ellipse indicates the isophote at a major axis distance of 1200′′. The crown is found in a region where the (BV) colour is on average 0.8, bluer than on the minor axis.

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