1. Chemical Discriminators of Cold Fronts in Clusters of Galaxies: The Case for A3667 Renato Dupke University of Michigan, Ann Arbor Alex Vikhlinin and Maxim Markevitch CfA

2. P = n kT = cont

3. External Mechanisms (Markevitch et al. 2000)

4. Abell 496 is a cD cluster at z=0.033, has a cold core. The image below shows the main cold front towards the North and other sharp edges (weaker cold fronts) towards SE and SW, indicated by the green arrows below. “Classic” Cold Fronts Abell 3667 & A2142 at z~0.06, have indications of an on- going merger.

6. Induced Internal Mechanisms (Tittley et al. 2005) From LCDM w/ cooling 30:1 mass ratio 200kpc boxsize 50Mpc time step

7. Ascasibar & Markevitch 2006 – DM blob passage – M DM2 /M DM1 =5, b=500kpc, panel size 1 Mpc, Temp scale shown, arrows show gas velocity wrt DM center parallel PM tree+SPH code GADGET2

8. 500 km/s

9. Si/S agrees w/ other ratios Dupke et al. 2007

10. Flint Blob, 2006

11. Heinz et al. 2003

12. Temperature - keV O/Fe A 3667

13. A 3667 ~ 350 ksec

14. A 3667 Temperature keV

15. A 3667 Temperature 7k - keV

16. A 3667

17. A 3667 Fe

18. A 3667 O/Fe

19. A 3667

20. A 3667 – Si/Fe 7k

22. O/Fe Si/Fe

23. What Does Cosmology Predict? Pawl, Evrard & Dupke 2005 Dashed  Max ΔV, Dot  All pointing pairs recovered from the perfect spectra after passing through Suzaku responses. f(>ΔV) α ΔV -4 vce.physics.lsa.umich.edu VCE is a prototype theoretical counterpart to the HEASARC archive for X-ray emitting clusters. 68 preheated simulated clusters. With 14 outputs per run, this creates a set of 1000 instances of clusters covering 0<z<2

24. Analysis of the distribution of SN Type enrichment can be used as an additional tool to corroborate the presence of and discriminate between different types of cold fronts in clusters. For A496 the combination of temperature distribution and numerical simulations suggests that the cold fronts are formed by sloshing due to the off-center passage of a massive dark clump 0.5 Gy ago. The analysis of SN type enrichment is also consistent with that scenario. Abundance ratio distribution across the cold front from a deep observation of A3667 are consistent with the standard model for cold front formation, i.e., remnant cores of subsonic or transonic mergers. Summary