Lawrence Rudnick University of Minnesota Deepwidebandpolarization 30 m Jy800sq deg 7001800 More science using subsamples This is single project from large survey Feasible with JVLA only NVSS level investment ID: 378918
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Slide1
Double Trouble: ASKAP Early Science using Radio Galaxies
Lawrence Rudnick, University of MinnesotaSlide2
Deep+wideband+polarization
~30
m
Jy,800sq
deg
700-1800
More science using subsamples
This is single project from large survey
Feasible with JVLA only: NVSS level investment
10
2.X – 3
hr
No
Use of all bands
HOT! HOT
Outcomes: low risk
CR origins in radio galaxies: in the AGN? or in situ ? (
a
vs. z)
RG environments + small scale Galactic structureSlide3
1. Cosmic Ray origins
Why
a vs. z* ?
Intrinsic
(AGN)
vs.
Environment
BUT, environments messy, so look at
a1
vs. a2
*Not a K-correction (Kamer ++)
Ly
a
DeBrueck
+ 2000Slide4
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
,
SundstromSlide5
Defining a sample of
double radio galaxies (DRGs)
and Random Pairs(RPs)
RP
DRGSlide6
Two lobes do “know” about each other (somewhat)
ROTATION MEASURE
FRACTIONAL POLARIZATION
RM1
RM2
± 100 rad/m2
± 100 rad/m2
Foreground stretching Slide7
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 surveySlide8
Deep+wideband+polarization
~30
m
Jy,800sq
deg
700-1800
More science using subsamples
This is single project from large survey
Feasible with JVLA only: NVSS level investment
10
2.X – 3
hr
No
Use of all bands
Outcomes: low risk
HOT! HOT! HOT!Slide9