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

Radio continuum - Components

synchrotron

free-free

Thermal dust

M82M82

z=9

z=0

Condon (1992)

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)

VLA-COSMOS

1.4

deg

ree

1.4

deg

ree

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)

9

10

11

12

13

14

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

Star Formation

Local example

AGN

10kpc

10kpc

COSMOS examples

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

Hopkins et al. (2000)

AGN steep

flat

starbursts

spirals

SKA EVLA HDF/COSMOS++ 1st/NVSS Cambridge

Faint Radio Sources - Number Counts

First Results - (preliminary) Source Counts(Bondi et al., in prep.)

(uncorrected)

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

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

First Results - Identification of (Sub)mm Galaxies(Bertoldi et al. 2006)

20’

23 MAMBO sources (3.5< < 7)

50% radio counterparts > 30 Jy

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

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

First Results - (preliminary) Source Counts(Bondi et al., in prep.)

Star Formation

6 cm

Schinnerer et al.

Local example

COSMOS examples

VLA-COSMOS

1.4

deg

ree

1.4

deg

ree

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

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

VLA-COSMOS - Source Numbers

~ 3500 sources (4.5sigma)~ 80% optical IDs => ~ 2300

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 %)

10kpc10kpc

Local example - Cygnus A

AGN - Radio Galaxies (+ …)

COSMOS examplesCOSMOS examples