double trouble: askap early science using radio galaxies
Post on 23-Feb-2016
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Double Trouble: ASKAP Early Science using Radio Galaxies
Lawrence Rudnick, University of Minnesota
Deep+wideband+polarization~30mJy,800sq deg 700-1800
More science using subsamples
This is single project from large surveyFeasible with JVLA only: NVSS
level investment
102.X – 3 hrNo
Use of all bands
HOT! HOTOutcomes: low risk
1. CR origins in radio galaxies: in the AGN? or in situ ? (a vs. z)
2. RG environments + small scale Galactic structure
1. Cosmic Ray origins
Why a vs. z* ? Intrinsic (AGN) vs. Environment
BUT, environments messy, so look at a1 vs. a2
*Not
a K
-cor
recti
on (K
amer
++)
Ly a
DeBrueck + 2000
RG local Intervening Galactic
2. RG environments (Faraday) + Galactic small scale structure
L. Rudnick, Shea Brown, Caitlin Johnson (still! In prep)Using NVSS, Taylor, Stil, Sundstrom
Defining a sample of double radio galaxies (DRGs)
and Random Pairs(RPs)
RPDRG
Two lobes do “know” about each other (somewhat)
ROTATION MEASUREFRACTIONAL POLARIZATION
RM1
RM2 ± 100 rad/m2
± 10
0 ra
d/m
2
Foreground st
retching
Some numbers … (tentative!!)• To determine a (< ± 0.1), need ~ 1.2 mJy• ~ 140/sq. deg (< 1’-0.5’ pairs, ~ 7-14 / sq. deg) 7-14,000 sources in 1000 sq. deg survey
• For RM, need ~0.3 mJy (P) 3.5 mJy I (@8.4%)
• ~ 30/sq deg. (< 1’-0.5’ pairs, ~ 1.5-3 / sq. deg) 1500-3000 sources in 1000 sq. deg survey
Deep+wideband+polarization~30mJy,800sq deg 700-1800
More science using subsamples
This is single project from large surveyFeasible with JVLA only: NVSS
level investment
102.X – 3 hrNo
Use of all bands
Outcomes: low risk
HOT! HOT! HOT!
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