1. Diffuse radio polarization, shocks, and large scale structure
Lawrence Rudnick, University of Minnesota
with Shea Brown,
Jeff Lemmerman, Jenny Imholte, Joseph Barthel, Chris Benson
E July, 0955h, 515B

2. Shocks, WHIM and large scale structure The observational challenge Developing probes of diffuse emission filtering subtraction polarization (and tantalizing pictures)

3. LSS = Shocks = Synchrotron

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

6. Finding diffuse - filtering

11. Finding diffuse - subtraction

13. Abell 1367

15. Missing large scale

17. Polarized emission
Large AND small scale

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

20. Dead radio galaxy?
~ 500 kpc

21. Abell 119

22. Diffuse polarization – confirm and separate

23. Abell 907 + A 901, 902 supercluster ROSAT NVSS P 9’ resolution
Stokes “U slices with GBT

24. Abell 576
DA240
“U”
“Q”

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