Bow Shock, Electron-Ion Equilibrium, Breakup of Cool Core, and Dark Subcluster in Abell 520

Details Bow Shock, Electron-Ion Equilibrium, Breakup of Cool Core, and Dark Subcluster in Abell 520 Bow Shock, Electron-Ion Equilibrium, Breakup of Cool Core, and Dark Subcluster in Abell 520

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cxo..prop.2455m&link_type=abstract

Chandra Proposal ID #09800847

Astronomy and Astrophysics

Astrophysics

Chandra Proposal Id #09800847

Scientific paper

Shock fronts provide a unique tool to study the cluster plasma. Only two have been found, those in 1E0657 and A520. Using a long observation of 1E0657, we have determined, for the first time in any astrophysical plasma, that electron-proton equilibration time is shorter than Coulomb - a tantalizing result but based on one object. A520 gives the only chance to confirm it. Its shock also coincides with an edge of the radio halo, enabling tests of the origin of the intracluster relativistic electrons. A520 also exhibits a remnant of a cool core broken up by merger-induced instabilities, providing data on plasma viscosity. Finally, weak lensing map of A520 reveals an intriguing dark subcluster almost devoid of galaxies. We propose a long observation of this exceptionally interesting cluster.

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