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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
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
Local pressure radio surface brightness

Mass distribution of shock heated gas (z=0)

Kang, Ryu, Cen, Song 2005 ApJ 620, 21

lss shocks synchrotron
LSS Shocks Synchrotron

Chris Pfrommer, various

Conference proceedings

slide8

~ EVLA D config

convolved to 8’ (2 Mpc)

diffuse polarization as whim probe
Diffuse POLARIZATIONas WHIM probe

RICH X-ray cluster

POOR, non-X-ray cluster

polarized emission
Polarized emission

Large AND small scale

slide14

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

depolarization
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
faraday rotation within beam
Faraday rotation within beam

CGPS

www.ras.ucalgary.ca/SKA/science/node11.html

5” 1.5”

Laing et al. 2008

internal line of sight depolarization
Internal (line of sight) depolarization

6cm 21cm

Anderson, Keohane, Rudnick 1995

rotation across band

λ1

λ1

λ0

λ0

λ2

λ2

Rotation across band

P = Q + iU

rm synthesis
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

slide21

RM movie of 3C33/Abell 150 field

available at http://www.astro.umn.edu/~larry/RESEARCH/a150rm.mpg