wallaby survey - lister staveley-smith...wallaby swg3 pre-processing workshop – swinburne march...
TRANSCRIPT
Lister Staveley-Smith
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Australian SKA Pathfinder (ASKAP)
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• Radio interferometer – 36 ×12-m dishes
• CSIRO Phased Array Feed (PAF) technology: 36 beams
• Frequency range 700 to 1800 MHz
• Instantaneous bandwidth 300 MHz
• Maximum baseline 6 km
• SKA precursor on a radio-quiet site
• Wallaby (HI) and EMU (continuum) are the two key survey science projects
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4
MurchisonShire
Netherlands
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Boolardy Station
Population density (people/km2)
GAMA 2017, ICRAR
0.0001
0.0100
1.0000
100.0000
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Wallaby goals
GAMA 2017, ICRAR
• Local Group/Volume
• Understanding Galaxies
• Cosmology
• Legacy
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Environmental suppression
GAMA 2017, ICRAR
Notransition(gas-bearing)galaxieswithin300kpcofMilkyWay:
• strippingorionization?
(Westmeieretal.2015;Spekkensetal.2014)
gas-richgaspoor
DISTANCEFROMMILKYWAY
GASRICH
NESS
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ASKAP Wallaby
GAMA 2017, ICRAR
• Local Group/Volume
• Understanding Galaxies
• Cosmology
• Legacy
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Gas accretion onto galaxies
GAMA 2017, ICRAR
NGC891:Oosterloo,Fraternali&Sancisi(2007)
EBHIS:Kerpetal.(2016)
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ASKAP Wallaby
GAMA 2017, ICRAR
• Local Group/Volume
• Understanding Galaxies
• Cosmology
• Legacy
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Redshift-space distortions
GAMA 2017, ICRAR
HI optical
Beutler
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ASKAP Wallaby
GAMA 2017, ICRAR
• Local Group/Volume
• Understanding Galaxies
• Cosmology
• Legacy
Comparison with other HI surveys
Area 3π 2.8π 0.7πRedshift 0- 0.26 0- 0.04 0- 0.06rms20km/s 0.7mJy/beam 13mJy/beam 1.5mJy/beamRes 30arcsec,4km/s 15arcmin,18km/s 3.5arcmin,5km/sNdet 500,000 5,000 30,000
GAMA 2017, ICRAR
Wallaby=WidefieldASKAPL-bandLegacyAll-skyBlindsurveYPIs:B.S.Koribalski&LStaveley-Smith
Den
sity
of S
pect
ra (N
/deg
2 )
Area (deg2)
2 Orders of Magnitude Improvement
Existing SurveyLimit
Meyer
SKA pathfinder HI surveys:
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Synergies
GAMA 2017, ICRAR
DINGO
WALLABY
Duffy,Gerstmann
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Spherical cap tiling (Robotham)
2016 PHISCC Cape Town 17
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Sensitivity images (Robotham)
2016 PHISCC Cape Town 18
Rawtilepattern– max/min=2.3 4-ptdither– max/min=1.2
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Wallaby timeline
GAMA 2017, ICRAR
• Sept 2014: commissioning science with BETA (6 antennas)
• Oct 2016: early science commenced with 12 antennas, 48 MHz
• Dec 2016: bandwidth increased to 192 MHz
• Sept 2017: bandwidth increased to 240 MHz
• Oct 2016: 16 antennas
• Apr 2018: 36 ASKAP antennas expected
• Dec 2018: full survey begins
GAMA 2017, ICRAR
FirstASKAPBETA+Wallabysciencepaper(Serraetal.2015)
IC1459group
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Wallaby timeline
GAMA 2017, ICRAR
• Sept 2014: commissioning science with BETA (6 antennas)
• Oct 2016: early science commenced with 12 antennas, 48 MHz
• Dec 2016: bandwidth increased to 192 MHz
• Sept 2017: bandwidth increased to 240 MHz
• Oct 2016: 16 antennas
• Apr 2018: 36 ASKAP antennas expected
• Dec 2018: full survey begins
Early Science (ES) focus: environment
GAMA 2017, ICRAR
Preprocessinginandoutsidegroups
WallabySWG3pre-processingworkshop –SwinburneMarch8-10(KilbornandWong)
19groups
Kilborn+09
Whendidgalaxieslosetheirgas?
Early Science progress
GAMA 2017, ICRAR
ESdataisvirtuallyidenticaltotheWallabymainsurveydatainresolutionandsensitivity
WALLABY ES fields
GAMA 2017, ICRAR
Westmeier
WALLABY/DINGO workflow
GAMA 2017, ICRAR
ES1 coverage
GAMA 2017, ICRAR
ES1NGC7232fieldandbeampatternoncolouredDSS
IC5201
IC 5201 in the NGC 7232 group
NGC7232group
GAMA 2017, ICRAR
credit:Whiting,Lee-Waddell,Madrid
NGC 7162/A in the NGC 7232 group
GAMA 2017, ICRARCredit:TristanReynolds
ES3 coverage
GAMA 2017, ICRAR
ES3Doradofieldandbeampatternoncoloured DSS
6deg
Dorado group
GAMA 2017, ICRAR
NGC1566
NGC1596
NGC1602
10% depth images from Dorado
GAMA 2017, ICRAR
NGC1596NGC1602
NGC1566
Credit:Egali,Kleiner,Rhee1night 1-3nights
NGC 1566: Slicer
GAMA 2017, ICRAR
Jonghwan Rhee
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Summary
GAMA 2017, ICRAR
• Wallaby science has started (4+2 ES fields - same area, resolution and sensitivity as ASKAP-36)
• Initial science focus: pre-processing in group environment
• Wallaby is zero-redshift, all-sky ‘anchor’ for high-z studies – most O/IR synergy with TAIPAN, SkyMapper, VISTA, VST, LSST
• Expected completion 2020/21
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Parameterizing ΛCDM + testing GR
GAMA 2017, ICRAR
2MTFvelocitypowerspectrum(2062galaxieswithTFdistances)+Planck:Howlett etal.(2017)