Galaxies Evolution and Environment: The Promises of Cosmos Hervé Aussel


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Galaxies Evolution and Environment: The Promises of Cosmos

  • Hervé Aussel

  • AIM, Saclay


The Cosmos Collaboration



COSMOS Goals

  • Study the assembly of visible and dark matter up to scales of 1014h-1 M as a function of redshift.

  • Study the evolution of galaxies and AGNs as a function of the environment and redshift.



COSMOS requirements

  • Environement:

  • Galaxies and AGNs

    • Depth
    • Image Quality
    • Multi Wavelength


Area

  • As large as possible !

    • Need to have a variety of environment at all redshift.
  • Wide area is time consuming

  • 2 square degrees

    • 50 Mpc at z = 0.5
    • 88 Mpc at z = 1
    • 137 Mpc at z = 2
    • 170 Mpc at z = 3


COSMOS Area



Depth

  • At z =2 , IAB = 26 correspond to L*



Image Quality

  • Morphology

  • Mass Maps using weak lensing



COSMOS

  • Area + Depth + Image Quality :

  • ACS Treasury Program

    • 590 HST orbits in cycles 12 and 13
    • 2 square degree
    • IAB = 27 (10 )
  • Proposal for cycle 14-15 for the g band

    • 590 orbits
    • g = 27,5 (10 )


Field Location

  • Equatorial Field

    • VLT
    • Subaru
    • VLA
    • ALMA
    • TMT
  • Low Background:

    • X-ray survey
    • IR survey
  • Low extinction

    • GALEX
  • VVDS spectroscopy



VVDS 10h field



VVDS 10h field



VVDS 10h field



COSMOS Field

  • Low Extinction

  • Low Background

    • IRAS 100 m:
      • COSMOS: 0.9 MJy/sr
      • Lockman: 0,5 MJy/sr
      • XMM-LSS: 1.3 Mjy/sr:
  • No bright radio/X-ray source

  • 10:00:28.6+02:12:21



COSMOS Field

  • Low Extinction

  • Low Background

    • IRAC 8 m:
      • COSMOS: 6.9 MJy/sr
      • Lockman: 5.0 MJy/sr
      • XMM-LSS: 7.1 Mjy/sr:
  • No bright radio/X-ray source

  • 10:00:28.6+02:12:21



COSMOS Field

  • Low Extinction

  • Low Background

    • MIPS 24 m:
      • COSMOS: 32.3 MJy/sr
      • Lockman: 18.4 MJy/sr
      • XMM-LSS: 31.1 MJy/sr
    • At most a loss of 20% in sensitivity w/r to non equatorial fields
  • No bright radio/X-ray source

  • 10:00:28.6+02:12:21



zCOSMOS

  • Large Program with VIMOS on VLT

  • 25000 redshifts with 0.3 < z < 1.0

    • selected at I < 22.5
    • at least 50% sampling
  • 12500 redshifts with 1.4 < z < 2.5

    • BZK & BM/BX selections
  • 1000 redshifts of X-ray, radio and GALEX sources



COSMOS Observations

  • ACS I band

  • zCOMOS

  • Megacam (5 nights), Subaru (25 nights)

    • u*,B,g,V,r, i, z, NB814 to AB 27
  • VLA 1.4 GHz

    • 8 Jy (1 )
  • XMM

    • 10-15 cgs
  • GALEX

    • FUV = 26.1, NUV 25.8 (100 orbits)


COSMOS proposals

  • ACS g band

  • Spitzer IRAC

    • Stellar Mass
  • MIPS imaging

    • SFR
      • UV
      • Radio
    • CIBR


ACS Observations Progress



Subaru Deep Imaging



ACS Strong Lensing



XMM COSMOS



Morphology-Density Relation

  • Capak et al.

  • Sample selection



Morphology-Density Relation

  • Elliptical fraction as a function of the environment and redshift.



Morphology-Density Relation



Morphology-Density Relation



Conclusion

  • COSMOS is a Treasury program

    • All data will be public
      • ACS
      • Spectra
      • XMM
      • Radio
      • etc...
    • IRSA is the data repository
    • www.astro.caltech.edu/~cosmos



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