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PUSHING into the WHIM

PUSHING into the WHIM. Lawrence Rudnick, Univ. Minnesota, EVLA Wkshp 2008 With contributions from Shea Brown & Damon Farnsworth, UMN and R. F. Cardoso, U WI. Work supported by NSF grant AST 0607674 at UMN. Local pressure radio surface brightness.

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PUSHING into the WHIM

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  1. PUSHING into the WHIM Lawrence Rudnick, Univ. Minnesota, EVLA Wkshp 2008 With contributions from Shea Brown & Damon Farnsworth, UMN and R. F. Cardoso, U WI Work supported by NSF grant AST 0607674 at UMN

  2. Local pressure radio surface brightness Mass distribution of shock heated gas (z=0) Kang, Ryu, Cen, Song 2005 ApJ 620, 21

  3. LSS Shocks Synchrotron Chris Pfrommer, various Conference proceedings

  4. 2 Mpc

  5. Finding diffuse - confusion

  6. Finding diffuse - filtering

  7. Finding diffuse - subtraction Abell 1367

  8. ~ EVLA D config convolved to 8’ (2 Mpc)

  9. Diffuse POLARIZATIONas WHIM probe RICH X-ray cluster POOR, non-X-ray cluster

  10. Finding diffuse polarization – undersampled reconstruction

  11. Missing large scale

  12. Polarized emission Large AND small scale

  13. Faraday clouds at high latitude? ►(<P>800) new diffuse source candidate. Symbols: clusters of galaxies Gal et al. 2003 (AJ 125, 1064). ► Stokes Q image WSRT @ 350 MHz (see text to right), with (<P>800) contours overlayed. Green: ~0 rad/m2 Yellow:~13 rad/ m2

  14. EVLA & Polarization EVLA

  15. Depolarization • Intrinsic disorder (no l dependence) • within beam (plane of sky) • along line of sight • Faraday rotation ( l2 dependence) • Within beam • Along line of sight in source • Across bandwidth

  16. Faraday rotation within beam CGPS www.ras.ucalgary.ca/SKA/science/node11.html 5” 1.5” Laing et al. 2008

  17. Internal (line of sight) depolarization 6cm 21cm Anderson, Keohane, Rudnick 1995

  18. λ1 λ1 λ0 λ0 λ2 λ2 Rotation across band P = Q + iU

  19. RM synthesis A&A 441, 1217-1228 (2005) DOI: 10.1051/0004-6361:20052990 Faraday rotation measure synthesis M. A. Brentjens - A. G. de Bruyn

  20. RM movie of 3C33/Abell 150 field available at http://www.astro.umn.edu/~larry/RESEARCH/a150rm.mpg

  21. 1000

  22. EVLA The EVLA niche – mixed thermal/relativistic

  23. PUSHING into the WHIM

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