Figure 5
![Left-hand panel: Hα image of the innermost 2 × 2 arcmin2 region of M87, divided by the best-fitting De Vaucouleurs profile, obtained by HST. Right-hand panel: Chandra pressure map [in units of , see Paper I for details on producing the pressure map] of the same inner 2 × 2 arcmin2 region overplotted with the 6 cm radio emission contours from Hines et al. (1989). The pressure map clearly shows a discontinuity, a likely shock front, at a radius of 0.6 arcmin. The Hα image shows that all the bright Hα filaments appear in the downstream region of the shock. The arrows identify the bright Hα features furthest from the centre, at the edges of apparently underpressured X-ray cavities, and a bright Hα‘knee’ on the southeast.](https://oup.silverchair-cdn.com/oup/backfile/Content_public/Journal/mnras/407/4/10.1111/j.1365-2966.2010.16755.x/2/mnras0407-2063-f5.jpeg?Expires=1750505063&Signature=l3xYOTXTkXpz5tF7lEV2krgRNM7auuUqNJluZcyZESqcmdPl3IUTkhtG9bxPLdwJ0SrsxE-gcR1NexvG5EhkLHqRzIzwBXVSAeQWbHcXftSjOSE2oqeMavkGZOCkTKtH5l2eMg1gBW57n2oaqwJV9luTKRaXcr56VMbjF9oQP5y3KhMrKaf39P147Ja5HgUAlHzbjr5Z9vchDEBMVqrGEVIQxmJQf8rLGJRRFGaoxmVhX5puSRBuYicx9PwIkFX3pRQIDRpTGc8DEHgEYbXvmf5MAmjAubi2cK8Kq2LbSBC6G00PNlu2jeUo5SOMi1VAaVZ~PJhjyy1vQweATiBRQg__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
Left-hand panel: Hα image of the innermost 2 × 2 arcmin2 region of M87, divided by the best-fitting De Vaucouleurs profile, obtained by HST. Right-hand panel: Chandra pressure map [in units of 
, see Paper I for details on producing the pressure map] of the same inner 2 × 2 arcmin2 region overplotted with the 6 cm radio emission contours from Hines et al. (1989). The pressure map clearly shows a discontinuity, a likely shock front, at a radius of 0.6 arcmin. The Hα image shows that all the bright Hα filaments appear in the downstream region of the shock. The arrows identify the bright Hα features furthest from the centre, at the edges of apparently underpressured X-ray cavities, and a bright Hα‘knee’ on the southeast.
