Probing the Faint Radio Population First Results from the VLA-COSMOS Survey
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Probing the Faint Radio Population First Results from the VLA-COSMOS
Survey
Eva Schinnerer (MPIA)V. Smolcic, C.L. Carilli, M. Bondi, P. Ciliegi,K. Jahnke, N.Z. Scoville
VLA-COSMOS TeamCOSMOS Collaboration
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Radio continuum - Components
synchrotron
free-free
Thermal dust
M82M82
z=9
z=0
Condon (1992)
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NRAO Very Large ArrayNRAO Very Large Array VLA-COSMOS team: Schinnerer (PI) Smolcic, Carilli, Bondi, Ciliegi, Scoville, Bertoldi, Blain, Impey, Jahnke, Koekemoer, Le Fevre, Urry, Vettolani
COSMOS field @ 1.4 GHz (20cm) continuum (1.5” resolution)
Pilot project (10hr): A array (Schinnerer et al. 2004) ~ 250 sources ~ 1 sqrdeg; rms ~ 30 Jy/beam
Large project (275hr): A+C array (product release: ~ June’06) ~ 3,600 sources ~ 2(1) sqrdeg; mean rms ~ 15(10) Jy/beam; Deep project (60hr): A array (data reduction underway) ~ 1 sqrdeg; expected rms ~ 6.8 Jy/beam (central 30’)
The VLA-COSMOS Survey(s)
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VLA-COSMOS
1.4
deg
ree
1.4
deg
ree
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20cm continuum surveys:
VLA-COSMOS survey: unique phase space X-ray - mm complementary data ~ 80% optical counterparts --> IRAC: 100%(?) spectroscopy (> 250 available; expected: 50%) (zCOSMOS, IMACS/Magellan)
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9
10
11
12
13
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Log
(FI
R L
um
inosi
ty)
ULIRGs
LIRGs
AGN - SF
Sadler et al. (2002), Chapman et al. (2003) Radio Surveys - LimitsRadio Surveys - Limits
Milky Way
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Star Formation
Local example
AGN
10kpc
10kpc
COSMOS examples
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CWAT-01 at z~0.2:Reveals complex galaxy cluster assemblyEvidence for mass build-up (~ 20% Coma cluster)
z ~ 0.2
First Results - Wide Angle Tail Radio Galaxy (Smolcic et al. 2006)
20cm
Xray: rainbowOptical: RGBRadio: red
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Hopkins et al. (2000)
AGN steep
flat
starbursts
spirals
SKA EVLA HDF/COSMOS++ 1st/NVSS Cambridge
Faint Radio Sources - Number Counts
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First Results - (preliminary) Source Counts(Bondi et al., in prep.)
(uncorrected)
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First Results - Optical Counterparts
~ 3600 sources (4.5sigma)(Ciliegi et al., in prep.)
R < 1.5”: 3181 radio – optical associations (87.5 %) for I < 23.5: 1570R < 1.0”: 2886 radio-optical associations (79.1%) for I < 23.5: 1526
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First Results - Population Mix
see Poster by Smolcic
Using Morphology:
ACS point-sources --> AGNAll 20cm radio sources
Using SED type:
EarlyLateStarburstbut be aware of type 1 AGN
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First Results - Identification of (Sub)mm Galaxies(Bertoldi et al. 2006)
20’
23 MAMBO sources (3.5< < 7)
50% radio counterparts > 30 Jy
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First Results - Radio Properties of LAEs(Carilli et al. 2006)
20”58 Ly emitters (z~5.7):(Ajiki et al. 2006)
No radio counterparts < 30 Jy No AGN (FRI ~ M87) no (sub)mm galaxy w/ SFR > 1000 Msun
Stacked limit (2): 4.4 Jy (all LAEs) 5.0 Jy (UV-detected LAEs) mean SFR < 250 Msun
consistent w/ known properties of LAEs
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VLA-COSMOS -
- Status - 3,644 sources (> 4.5) in 2 sqrdeg (rms ~
10 Jy) - central 30’ down to rms ~ 7 Jy
(underway) - ~ 80% optical counterparts (-->
spectroscopy)
- Science - 20cm emission: SF/AGN contribution - single targets: e.g. WAT radio galaxy - identification: (sub)mm sources - stacking analysis: LAE, …
- Products - 1.4 GHz image - source catalog - public release @ IRSA archive: ~ June
‘06
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First Results - (preliminary) Source Counts(Bondi et al., in prep.)
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Star Formation
6 cm
Schinnerer et al.
Local example
COSMOS examples
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VLA-COSMOS
1.4
deg
ree
1.4
deg
ree
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z ~ 1.0z ~ 1.0
VLA-COSMOS vs. HST morphologiesVLA-COSMOS vs. HST morphologies
2”2”
2”2”
2”2”
2”2”
z ~ 0.2z ~ 0.2
z ~ 1.3z ~ 1.3
z ~ 0.2z ~ 0.2
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NRAO Very Large Array VLA Large Project PI: Schinnerer Smolcic, Carilli, Bondi, Ciliegi, Scoville, Bertoldi, Blain, Impey, Jahnke, Koekemoer, Le Fevre, Urry, Vettolani
A+C configuration @ 1.4 GHz (20cm) continuum 270hr: ~ 3,500 sources (catalog underway) ~ 2 sqrdeg; rms ~ 10 microJy/beam; ~ 1.5” resolution (weighting: robust =0) ~ 45 days total
+ 60hr: A array (awarded: spring 2006) central 30’: rms --> 6.8 microJy/beam
The VLA-COSMOS Survey
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VLA-COSMOS - Source Numbers
~ 3500 sources (4.5sigma)~ 80% optical IDs => ~ 2300
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Within 1.5 arcsec we have 3181 (1570 I<23.5) radio – optical associations (87.5 %)
Within 1.0 arcsec we have 2886 (1526 I<23.5) association (79.1 %)
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10kpc10kpc
Local example - Cygnus A
AGN - Radio Galaxies (+ …)
COSMOS examplesCOSMOS examples