Chandra observation of the most interesting cluster in the Universe

Details Chandra observation of the most interesting cluster in the Universe Chandra observation of the most interesting cluster in the Universe

2005-11-11

arxiv.org/abs/astro-ph/0511345v1

Astronomy and Astrophysics

Astrophysics

5 pages, to appear in Proc. "The X-ray Universe 2005", San Lorenzo de El Escorial, Spain, September 2005

Scientific paper

Chandra has recently observed 1E0657-56, a hot merging system at z=0.3 (the ``bullet'' cluster), for 500 ks. I present some of the findings from this dataset. The cluster exhibits a prominent bow shock with M=3.0+-0.4 (one of only two known M>>1 shock fronts), which we use for a first test of the electron-ion equilibrium in an intergalactic plasma. The temperatures across the shock are consistent with instant shock-heating of the electrons; at 95% confidence, the equilibration timescale is much shorter than the collisional Spitzer value. Global properties of 1E0657-56 are also remarkable. Despite being extremely unrelaxed, the cluster fits well on the Lx-T relation, yet its total mass estimated from the M-T relation is more than twice the value measured from lensing. This is consistent with simulations predicting that in the middle of a merger, global temperature and X-ray luminosity may be temporarily boosted by a large factor.

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