The COSMOS project: The Ultimate Hubble Cosmic Evolution Survey

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The COSMOS project The Ultimate Hubble Cosmic
Evolution Survey

• Jean-Paul Kneib
• (Laboratoire dAstrophysique de Marseille)
• on behalf of the COSMOS Team 70 scientists
• in America, Europe and Japan

http//cosmos.astro.caltech.edu/
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The distribution of dark matter on large scales
DARK MATTER DENSITY, COLOR-CODED BY DENSITY
AND VELOCITY DISPERSION
Millennium Simulation 1010 particlesComparing
Mock Catalogs to Deep Multi-Wavelength
Observations
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The light distribution of galaxies on large
scales DENSITY OF RED AND BLUE GALAXIES
125 Mpc/h
Millennium Simulation 1010 particlesComparing
Mock Catalogs to Deep Multi-Wavelength
Observations
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Probing the Large Scale Structure at high Redshift

• Redshift slice
• from ? CDM simulation (Fenk et al) show the
  typical Large Scale Structures expected to be
  identified in COSMOS.
• AIM trace galaxy (morphological) evolution
  within the LSS probed by
• Galaxies, X-ray and
• Lensing

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Recap of COSMOS Survey Features

• The Largest Contiguous Area observed with Hubble
  (cycle 12-13)
• Large Area 1.4 x 1.4 deg
• gt Cover largest large scale structures
  (2.1014 Solar Mass)
• gt Rare Objects at high redshift (total of
  2.1016 galaxies)
• High Sensitivity ( I 27 mag, 10?) and High
  Resolution (0.1)
• gt Morphology of L galaxies at z lt 2
• gt Strong and weak lensing (probe of DM)
• Equatorial Field 10h 02
• gt Multi-? observations from all telescopes
• Complementary to other Deep Survey
• (UDF, GOODS, GEMS, CFHTLS,
• VVDS, DEEP, SDSS )

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A massive Observational Endeavor

• Space Observations
• Hubble -- very fine sensitive optical
  images
• XMM -- xray imaging
• Galex -- ultraviolet imaging
• Spitzer -- Mid IR w/ IRAC
• Chandra?
• Ground Based Observations
• Subaru/CFHT -- multiple color imaging
• VeryLargeArray -- radio imaging
• CSO/IRAM -- (sub)mm imaging
• NIR -- NOAO, UH88, UKIRTCFHT
• ESO-VLT Magellan-- spectro. 50,000
  gal.

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HUBBLE Treasury Data PINick Scoville Caltech 590
orbits ACS/F814W (2 sq.deg) NICMOS-3/ F160W (
7 of area) Shown 477 orbits as of mid May 2005
ACS
Native 100k x 100k image Drizzled 165k x 165k
gt 100 Gb image !!!
1.4 degree
NICMOS-3 1.6 ?m -- 24mag 7 of area
ACS I-band
Koekemoer et al
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Weak Lensing in COSMOS

• The PSF pattern is time dependent
• Variation depend on telescope focus
• Model PSF variation to correct image shapes (use
  of TinyTim)
• From image shapes will compute
• Mass maps
• Cosmic shear estimates
• Galaxy-galaxy lensing to measure galaxy halo mass
• Probe mass of groups and clusters
• Relate morphology to DM/LSS distributions

Rhodes et al
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Mass Map on central 1 sq.degree
Cluster at z0.73
Massey et al
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Mass Aperture Statisticson central 1 sq.degree
Theory
E-mode signal
B-mode signal
Massey et al
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First Strong Lensing Systems in COSMOS
Faure et al
We expect 20-50 strong lensing systems, Sample
comparable in size to other strong lensing
surveys!!! Probe mass dsitribution and
Cosmology(?)
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OtherSystems
RE0.7

• RE0.7

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SUPRIME _at_ Subaru PIY. Taniguchi Tohoku
Univ. 1.5x1.5 deg 0.7'' seeing BVgriz
bands MEGACAM _at_ CFHT U band KPNO/CTIO K band
2x106 galaxies
AIM _at_ Subaru 18 medium bands for precise photo-z
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Ground Based Photometric Catalog
Capak et al.

• I-band selected photometric catalog containing
  800,000 galaxies (I (AB) lt 26 mag) in 8 bands
  (UBVgRizK)
• Star-Galaxy separation using magnitude-surface
  brightness diagram/Stellarity parameter
• Astrometry accurate to lt 0.05 arcsec
• Photometry accurate to 0.04 mag

AB (5 sigma) U 27.5, B 27.8, V 26.9
R 26.8, I 26.5, Z 25.5, Ks 22.5
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Current Photometric Redshift
Mobasher et al

• Photometric redshift using 8 different bands,
• Tuned with the current 1000 spectroscopic
  redshift
• already known in the COSMOS field (2dF, SDSS,
  VIMOS)
• About 200000 objects with good photo-z

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Comparison of photoZ catalog with Semi-Analytic
model predictions (Millenium)
M. Kitzbichler et al

• Photo-z with Rlt25

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Evolution of R-I color distribution with redshift
M. Kitzbichler et al
Millennium
COSMOS

• Overall trend from k-corrections comes out
  correct less scatter (sharper) maybe fewer
  extremely red objects (however diluted, would
  have to quantify more systematically)

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XMMPI G. HasingerMPE
red -- 0.5-2 keV
green -- 2-4.5 keV
blue -- 4.5-10keV

• 50 ks/pointing
• 1000 sources
• Detected
• A. Finogenov

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Photo-zLight Maps
Coded by luminosityMost luminous in red

• A. Finogenov

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X-ray diffuse sources vs. Light map

• Total 130
• Groups 76
• AGN 29
• No ID 22
• Low-z gal. 2
• Stars 3

• Blue Low-z
• Red High-z
• A. Finogenov

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COSMOS environment ltgt evolution
Scoville et al
luminous early-type gt dense core of LSS
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Z 0.73 cluster DM lensing X-ray
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Z 0.73 cluster X-ray ACS
39 LSS w/I COSMOS, up to 1014 Msun
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Measure two-point correlation function as a
function of photo-z
Guzzo et al
COSMOS (photo-z,filled)

• Redshift-space correlations simply destroyed by
  photo-z errors
• Solution treat redshift errors as (very large)
  redshift-space distortions and use projected
  function in z slices

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GALEXCOSMOSPI David SchiminovishColumbia
Green Contours GALEX NUV on COSMOS ACS

• 5 resolution,
• 1500-2300 A bands,
• 50 to 200ks exposure
• 100,000 galaxies detected down to NUV25.5
• Excellent tracer of SFR in the range 0ltzlt1
• Morphology of UV sources as a function of UV
  luminosity

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VLACOSMOSPIEva Schinnerer, MPIA

• 1.4 GHz
• 256h A-array
• 24h C-array
• 16000x16000 pixels
• 0.34/pixel
• rms 10mJy/beam
• 3000 sources, 60 with optical ID
• Absolute Astrometry
• of COSMOS
• AGN science

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zCOSMOS VIMOS Redshift survey
PI Simon Lilly, ETH

• Faint Sample (270 hours)
• Ground based Color selected to probe
• high redshift (1.5ltzlt2.5 tail)
• Blue Low Res grism UBVR
• BzK selection
• 13000 redshifts central area

• Bright Sample (270 hours)
• ACS selected IABlt22.5
• Red Medium Res grism -gt velocity
• 27000 redshifts full area

Faint colour-selected catalogue
bright catalogue
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Conclusion and Prospects

• Cosmos is the ultimate Hubble galaxy evolution
  survey
• Data taking is not yet finished
• Imaging 50 in place
• Spectroscopy just starting VIMOS/VLT
  IMACS/Magellan
• First analysis coming out special ApJ issue to
  be published early 2006 together with images and
  catalogues
• But still a lot of work for proper results

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First view on COSMOS but more to come
Roberto Abraham Masaru Ajiki Justin Alpert Herve
Aussel Josh Barnes Andrew Blain Daniela
Calzetti Peter Capak John Carlstrom Chris
Carilli Andrea Cimatti Andrea Comastri Marcella
Corollo Emannuel Daddi Richard Ellis Martin
Elvis Amr El Zant Shawn Ewald Mike Fall Alexis
Finoguenov Alberto Franceschini
Mauro Giavalisco Richard Griffiths Gigi
Guzzo Gunther Hasinger Chris Impey Jean-Paul
Kneib Karel Nel Jin Koda Anton Koekemoer Alexie
Leauthaud Olivier LeFevre Ingo Lehmann Simon
Lilly Thorsten Lisker Charles Liu Richard
Massey Henry McCracken Yannick Mellier Satoshi
Miyazaki Bahram Mobasher Alexandre Refregier
Alvio Renzini Jason Rhodes Mike Rich Dave
Sanders Shunji Sasaki Dave Schminovich Eva
Schinnerer Nick Scoville Marco Scodeggio Kartik
Sheth Patrick Shopbell James Taylor Dave
Thompson Neil Tyson Meg Urry Yoshi
Taniguchi Lidia Tasca Ludovic Van Waerbeke Paolo
Vettolani Simon White Lin Yan ..