pushing into the whim
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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PUSHING into the WHIM
Lawrence Rudnick, Univ. Minnesota, EVLA Wkshp 2008With contributions from Shea Brown & Damon Farnsworth, UMN
and R. F. Cardoso, U WI
Work supported by NSF grant AST 0607674 at UMN
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Local pressure radio surface brightness
Mass distribution of shock heated gas (z=0) Kang, Ryu, Cen, Song 2005 ApJ 620, 21
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LSS Shocks Synchrotron
Chris Pfrommer, variousConference proceedings
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2 Mpc
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Finding diffuse - confusion
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Finding diffuse - filtering
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Finding diffuse - subtraction
Abell 1367Abell 1367
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~ EVLA D configconvolved to 8’ (2 Mpc)
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Diffuse POLARIZATIONas WHIM probe
RICH X-ray cluster
POOR, non-X-ray cluster
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Finding diffuse polarization – undersampled reconstruction
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Missing large scale
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Polarized emission
Large AND small scale
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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
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EVLA & Polarization
EVLA
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Depolarization
• Intrinsic disorder (no dependence)– within beam (plane of sky)– along line of sight
• Faraday rotation ( dependence)– Within beam– Along line of sight in source– Across bandwidth
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Faraday rotation within beam
www.ras.ucalgary.ca/SKA/science/node11.html
CG
PS
5” 1.5”Laing et al. 2008
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Internal (line of sight) depolarization
6cm 21cm
Anderson, Keohane, Rudnick 1995
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Rotation across band
λ1 λ2λ0
λ1 λ2λ0
P = Q + iU
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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
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RM movie of 3C33/Abell 150 fieldavailable at http://www.astro.umn.edu/~larry/RESEARCH/a150rm.mpg
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1000
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The EVLA niche – mixed thermal/relativistic
EVLA
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PUSHING into the WHIM
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