mwa gleam insights to extragalactic radio sources @ low ... · mwa science (since mid 2013) 1...
TRANSCRIPT
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CaroleJacksonICRAR-CurtinUniversity20October2015
MWAGLEAMInsightstoextragalacticradiosources@lowfrequencies
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MasterTitle2
Theextragalacticsky;defined>1GHz
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MasterTitle3
1nJy at1.4GHz?
Theextragalacticsky;defined>1GHz
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MasterTitle4
1nJy at1.4GHz?
Theextragalacticsky;defined>1GHz
CompilationbyWall,1994
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Theextragalacticlowfrequencysky
CurrentworkinvolvessignificantextrapolationfromhigherνSamplesatlowfrequencies aretiny
&arehighlydegenerate tomodelfits.
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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.
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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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Perth
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MRO:Australia’sSKAsite
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gazettedtowns:0
population:“upto120”
MurchisonRadioObservatoryMRO:Australia’sSKAsite
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MurchisonWidefield Array(MWA)
• World’sfirstoperationalSKAprecursor(August2013)• Managed&operatedbyCurtinUniversity• 128tiles(collectingarea~2750m2 at150MHz)– eachof16dipoles• Frequencyrange72MHz- 300MHz(30MHzBW)• Maximumbaseline3km• MWASystemdescription
Tingay etal.PASA,2013
MasterTitle11
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MWA– MurchisonWidefield Array
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MWAInternationalCollaboration-2015Aus,NZ,India,USA
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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
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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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Footertext- slideshowtitle
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
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Footertext- slideshowtitle
GLEAMzoomedsnapshot(2min)
Fullobservation~35degx (150MHz)Beamsize2.46x2.24arcmin
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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)
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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
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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).
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~3CRtypesources(N=272/2143)
FainterRGs,lowerPower&/orhigherz
GLEAMbrightsourcesample
4Jy
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GLEAMbrightsourcesample
GLEAM
3CR
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GLEAMbrightsourcesample
GLEAM&3CR
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FRI FRII
V/Vmax (3CQs:Longair &Scheuer,1970)
RGPopulationevolution 3CRsample
?
Isthisreal,orbiasedbythesmallluminosity range
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~3CRtypesources(N=272/2143)
FainterRGs,lowerPower&/orhigherz
GLEAMbrightsourcesample
~40%ofallGLEAMsourcesaremultiples inNVSS/SUMSS (TomFranzen)
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Footertext- slideshowtitle
3CRinference&sourcecountmis-fits
Blue:3CRR– definessmallpartofRLFacrosslarge(P,z)range
GLEAM4Jy – muchwider(P,z)‘fit’canbeconstrainedbydeepcountsbutliabletomassiveextrapolation…!
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CaroleJacksonCarole.Jackson@curtin.edu.auICRAR-CurtinUniversity1TurnerAvenueBentley,WA6102Australia