CaroleJacksonICRAR-CurtinUniversity20October2015

MWAGLEAMInsightstoextragalacticradiosources@lowfrequencies

MasterTitle2

Theextragalacticsky;defined>1GHz

MasterTitle3

1nJy at1.4GHz?

Theextragalacticsky;defined>1GHz

MasterTitle4

1nJy at1.4GHz?

Theextragalacticsky;defined>1GHz

CompilationbyWall,1994

5

Theextragalacticlowfrequencysky

CurrentworkinvolvessignificantextrapolationfromhigherνSamplesatlowfrequencies aretiny

&arehighlydegenerate tomodelfits.

6

Theextragalacticlowfrequencysky

CurrentworkinvolvessignificantextrapolationfromhigherνSamplesatlowfrequencies aretiny

&arehighlydegenerate tomodelfits.

Use(new)low-frequencysamples(<fewhundredMHz)LOFAR(10-250MHz)andMWAGLEAM(72– 231MHz)

Definepopulations,characteristicsetc usingWISE,SDSS,VLA,AT20G,GAMA,SKAprecursorsetc.

->precisionskymodelsforSKA-eraofbillion-galaxysurveys,Foregroundextraction(EOR),AGNlifetime(fueling,feedback)etc.

MWAGLEAMsurvey

MWA– observeallsouthernsky<+30deg dec;72-231MHz

MWACSsurvey(Hurley-Walkeretal)PASA2014GLEAMsurveypaper(Wayth etal)PASA2015

1st yearGLEAMextragal catalogue:release early2016~300,000sourcesto~8mJy rms5x30MHzbands‘wide’20x8MHzbands‘narrow’

(Hurley-Walkeretal,inprep)+2ndyearobservationscomplete:reachingconfusionlimit~100MHz

Falsecolour imageMWAGleam:Hurley-Walkeretal

Perth

MRO:Australia’sSKAsite

gazettedtowns:0

population:“upto120”

MurchisonRadioObservatoryMRO:Australia’sSKAsite

MurchisonWidefield Array(MWA)

• World’sfirstoperationalSKAprecursor(August2013)• Managed&operatedbyCurtinUniversity• 128tiles(collectingarea~2750m2 at150MHz)– eachof16dipoles• Frequencyrange72MHz- 300MHz(30MHzBW)• Maximumbaseline3km• MWASystemdescription

Tingay etal.PASA,2013

MasterTitle11

MWA– MurchisonWidefield Array

MWAInternationalCollaboration-2015Aus,NZ,India,USA

13

MWAScience(sincemid2013)

1 StatisticaldetectionofEORglobalsignature(~120– 180MHz)

2 Galactic&ExtragalacticSurveyscience72– 231MHzall-skysurvey(continuousfrequencycoverage)TalkbyTomFranzen

3 Timedomainastronomy:Transients,FRBs,Pulsars,ESPs&moreTalkbyJ-PMacquart

4 Solarscience&spaceweather(includingionosphere)PosterbyJohnMorgan

39refereedjournalpapers(publishedoraccepted)MWAdatareleased:mwatelescope.org/astronomers/public-data-release

MWAGLEAMsurvey

MWA– observeallsouthernsky<+30deg dec;72-231MHz

MWACSsurvey(Hurley-Walkeretal)PASA2014GLEAMsurveypaper(Wayth etal)PASA2015

1st yearGLEAMextragal catalogue:release early2016,~300,000sourcesto~8mJy rms5x30MHzbands‘wide’20x8MHzbands‘narrow’

(Hurley-Walkeretal,inprep)+2ndyearobservationscomplete:reachingconfusionlimit~100MHz

Falsecolour imageMWAGleam:Hurley-Walkeretal

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TheTEAM

MartinBell(CSIRO)JoeCallingham (USyd)KSDwarakanath (RRI)Bi-QingFor(ICRAR-UWA)TomFranzen (ICRAR-Curtin)BryanGaensler (USyd/Toronto)PaulHancock(ICRAR-Curtin)LukeHindson (VUW/)NatashaHurley-Walker(ICRAR-Curtin)MelanieJohnston-Hollitt (VUW)AnnaKapinska (ICRAR-UWA)

EmilLenc (USyd)BenMcKinley (UMelbourne)JohnMorgan (ICRAR-Curtin)AndreOffringa (ANU/ASTRON)Pietro Procopio (UMelbourne)RandallWayth (ICRAR-Curtin)ChenWu(ICRAR-UWA)CathieZheng (VUW)

+largenumber ofMWAcollaborationmembersusingGLEAMforgalactic&Extragalacticresearch

Footertext- slideshowtitle

GLEAMzoomedsnapshot(2min)

Fullobservation~35degx (150MHz)Beamsize2.46x2.24arcmin

18

Theextragalacticlowfrequencysky

CurrentworkinvolvessignificantextrapolationfromhigherνSamplesatlowfrequencies aretiny

&arehighlydegenerate tomodelfits.

*Small*isthewordatlowfrequency– smallarea&/orsmall#s….3CRR– 173sources,S_178 MHz>10.9Jy – 100%complete7CI– 37sources,S_151 MHz>0.51Jy – 90%complete7CII– 54sources,S_151 MHz>0.48Jy – 90%complete7CIII- 37sources,S_151 MHz>0.5Jy – 95%completeTOOTS-00– 47sources,S_178 MHz>0.1Jy – ~80%complete

3CRR– Laing,Riley&Longair,MRAS,19837C&TOOTScompilationscollated&updatedbyLMKer

(PhDthesis;Edinburgh2013)

Low-resolutionextragalacticscience

MWA(GLEAM)scienceWorkshop(Oct2014)WorkingwithMWAresolution

- Crosswavebandid’s(radio,optical…)Resolution(blendingofsources;complexsources)

- Multitudeofradio&otherdata:sourcedensity~8sourcespersq deg at200MHz(S>80mJy)

- Reliabilityandconfidencelimits- Noise:sidelobes,confusion

MWAJ0709-3603S=7.64Jy (150MHz)

Hostgalaxy?

50 100 150

50

100

150

(pixels)

(pixels)MRC_0707-359A.fits.gz_0

7h09m20s7h09m30s7h09m40s7h09m50s

-36:06

-36:04

-36:02

-36:00

RA

DECskyview.tmp_1433893450_0

GLEAMBrightSourcesample

“GLEAM4Jy sample”- A fundamentalsouthernskysampleofbright radio

sourcesakinto3CR- About10*larger:2143sourcesvs 173in3CR- Directinsighttosourcepopulations&theirevolution

(spacedensity)+GLEAMSEDs72-231MHz

Sourcescatalogued@151MHz(147-155MHznarrowbandimage)RA0- 24hr,Dec+20,-72deg;|b|>10deg (4.9sr)

=>remove(afew)galacticsourcecontaminants;=>excludesafewclassAsourcesexcisedinGLEAMimaging;=>checkforanydiffuseextragalacticsources(later).

~3CRtypesources(N=272/2143)

FainterRGs,lowerPower&/orhigherz

GLEAMbrightsourcesample

4Jy

GLEAMbrightsourcesample

GLEAM

3CR

GLEAMbrightsourcesample

GLEAM&3CR

FRI FRII

V/Vmax (3CQs:Longair &Scheuer,1970)

RGPopulationevolution 3CRsample

?

Isthisreal,orbiasedbythesmallluminosity range

~3CRtypesources(N=272/2143)

FainterRGs,lowerPower&/orhigherz

GLEAMbrightsourcesample

~40%ofallGLEAMsourcesaremultiples inNVSS/SUMSS (TomFranzen)

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3CRinference&sourcecountmis-fits

Blue:3CRR– definessmallpartofRLFacrosslarge(P,z)range

GLEAM4Jy – muchwider(P,z)‘fit’canbeconstrainedbydeepcountsbutliabletomassiveextrapolation…!

CaroleJacksonCarole.Jackson@curtin.edu.auICRAR-CurtinUniversity1TurnerAvenueBentley,WA6102Australia