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Probing the Faint Radio Population First Results from the VLA-COSMOS Survey

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 Team COSMOS Collaboration. M82. Thermal dust. z=0. z=9. synchrotron. free-free.

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Probing the Faint Radio Population First Results from the VLA-COSMOS Survey

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  1. 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 Team COSMOS Collaboration

  2. M82 Thermal dust z=0 z=9 synchrotron free-free Radio continuum - Components Condon (1992)

  3. The VLA-COSMOS Survey(s) NRAO 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’)

  4. VLA-COSMOS 1.4 degree

  5. 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)

  6. Sadler et al. (2002), Chapman et al. (2003) Radio Surveys - Limits 14 AGN - SF 13 12 ULIRGs Log (FIR Luminosity) 11 LIRGs 10 9 Milky Way

  7. Star Formation AGN 10kpc Local example 10kpc COSMOS examples

  8. First Results - Wide Angle Tail Radio Galaxy z ~ 0.2 (Smolcic et al. 2006) 20cm Xray: rainbow Optical: RGB Radio: red CWAT-01 at z~0.2: Reveals complex galaxy cluster assembly Evidence for mass build-up (~ 20% Coma cluster)

  9. Faint Radio Sources - Number Counts AGN steep flat starbursts spirals SKAEVLAHDF/COSMOS++1st/NVSS Cambridge Hopkins et al. (2000)

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

  11. First Results - Optical Counterparts (Ciliegi et al., in prep.) ~ 3600 sources (4.5sigma) R < 1.5”: 3181 radio – optical associations (87.5 %) for I < 23.5: 1570 R < 1.0”: 2886 radio-optical associations (79.1%) for I < 23.5: 1526

  12. First Results - Population Mix Using SED type: Early Late Starburst but be aware of type 1 AGN Using Morphology: ACS point-sources --> AGN All 20cm radio sources see Poster by Smolcic

  13. First Results - Identification of (Sub)mm Galaxies (Bertoldi et al. 2006) 23 MAMBO sources (3.5<  < 7) 50% radio counterparts > 30 Jy 20’

  14. First Results - Radio Properties of LAEs (Carilli et al. 2006) • 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 20”

  15. 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

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

  17. COSMOS examples Star Formation Local example 6 cm Schinnerer et al.

  18. VLA-COSMOS 1.4 degree

  19. VLA-COSMOS vs. HST morphologies 2” 2” 2” 2” z ~ 0.2 z ~ 0.2 z ~ 1.0 z ~ 1.3

  20. The VLA-COSMOS Survey 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

  21. VLA-COSMOS - Source Numbers ~ 3500 sources (4.5sigma) ~ 80% optical IDs => ~ 2300

  22. 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 %)

  23. Localexample - Cygnus A 10kpc 10kpc COSMOS examples COSMOS examples AGN - Radio Galaxies (+ …)

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