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

This study presents the first results from the VLA-COSMOS survey, which aims to probe the faint radio population in the COSMOS field. The survey utilizes the VLA radio telescope to study the radio continuum emissions of various components, including thermal dust, synchrotron, and free-free emissions. The survey provides valuable insights into the population mix, source identification, and properties of galaxies in the COSMOS field.

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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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