MICE Galaxy Catalogue J. Carretero F. Castander M. Crocce P. - - PowerPoint PPT Presentation

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MICE Galaxy Catalogue J. Carretero F. Castander M. Crocce P. - - PowerPoint PPT Presentation

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MICE Galaxy Catalogue J. Carretero F. Castander M. Crocce P. Fosalba E. Gaztaaga www.ice.cat/mice domingo 8 de julio de 2012 1 MOCK GALAXY CATALOGUE Generating mock galaxy catalogues from N-body haloes using HOD prescription + all

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SLIDE 1

MICE Galaxy Catalogue

  • J. Carretero
  • F. Castander
  • M. Crocce
  • P. Fosalba
  • E. Gaztañaga

www.ice.cat/mice

1 domingo 8 de julio de 2012

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SLIDE 2
  • Generating mock galaxy catalogues from N-body

haloes using HOD prescription + all sky lensing maps

  • Constraints:
  • Luminosity function
  • Colour-magnitude diagram
  • Clustering as a function of colour and luminosity

MOCK GALAXY CATALOGUE

2 domingo 8 de julio de 2012

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SLIDE 3
  • MICE Grand Challenge simulation

70 billions particles, 3 Gpc/h box, mp=3×1010 M

  • Lightcone without repetition up to z ~ 1.4
  • FoF haloes with b=0.2 (150 millions, npart ≥ 10)
  • 1 octant (5000 sq.deg.)
  • 117M galaxies
  • Contents:
  • Positions (RA, DEC, z)
  • Magnitudes
  • SEDs
  • Lensing (convergence & shear)

MOCK GALAXY CATALOGUE

3 domingo 8 de julio de 2012

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SLIDE 4

z = 0 z = 1.4

HALO CATALOGUE

4 domingo 8 de julio de 2012

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SLIDE 5

“ The onion universe: all sky light-cone simulations in spherical shells ” Fosalba et al, MNRAS, 391, 435 (2008)

  • Split the data into thin shells.
  • Interpolate into (Healpix) pixels
  • Combine to produce convergence maps
  • From this, it is possible to obtain other lensing observables, e.g. shear,

magnification, flexion, etc in the Born approximation

LENSING IN MICE SIMS

5 domingo 8 de julio de 2012

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SLIDE 6
  • Shear power

spectrum for sources at z=1 (sub arc-min resolution)

LENSING IN MICE SIMS

6 domingo 8 de julio de 2012

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SLIDE 7
  • Large N-body MICE simulation provides haloes
  • Each halo contains one central galaxy and maybe

some satellite galaxies

  • Compute how many satellite galaxies populate each

halo (HOD) <Nsat> = (M/M1)α

  • Assign luminosities to central and satellite galaxies

conserving the luminosity function

HALO OCCUPATION DISTRIBUTION

7 domingo 8 de julio de 2012

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SLIDE 8

LUMINOSITY FUNCTION

8 domingo 8 de julio de 2012

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SLIDE 9
  • Large N-body MICE simulation provides haloes
  • Each halo contains one central galaxy and maybe

some satellite galaxies

  • Compute how many satellite galaxies populate each

halo (HOD) <Nsat> = (M/M1)α

  • Assign luminosities to central and satellite galaxies

conserving the luminosity function

  • Assign colours to central and satellite galaxies

reproducing the colour-magnitude diagram

HALO OCCUPATION DISTRIBUTION

9 domingo 8 de julio de 2012

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SLIDE 10

COLOUR-MAGNITUDE DIAGRAM

10 domingo 8 de julio de 2012

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SLIDE 11
  • Compute positions and velocities for centrals and

satellites within the halo. NFW and Virial Theorem

  • Compute the projected correlation function as a

function of colour and magnitude and compare with

  • bservations
  • Tune HOD parameters and the assignment of

luminosities and colours to fit the correlation function

HALO OCCUPATION DISTRIBUTION

11 domingo 8 de julio de 2012

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SLIDE 12

RED BLUE

GALAXY CLUSTERING

12 domingo 8 de julio de 2012

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SLIDE 13

GALAXY CLUSTERING

13 domingo 8 de julio de 2012

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SLIDE 14

GALAXY CLUSTERING

14 domingo 8 de julio de 2012

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SLIDE 15
  • All-sky convergence maps computed in 3D in the LC
  • Compute shear in this 3D grid
  • Assign convergence and shear to galaxies

LENSING APPLIED TO GALAXIES

15 domingo 8 de julio de 2012

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SLIDE 16
  • Compute positions and velocities for centrals and

satellites within the halo. NFW and Virial Theorem

  • Compute the projected correlation function as a

function of colour and magnitude and compare with

  • bservations
  • Tune HOD parameters and the assignment of

luminosities and colours to fit the correlation function

  • Assign full SEDs
  • Tune model parameters at higher redshift
  • Assing sizes and ellipticities

METHOD HALO OCCUPATION DISTRIBUTION

16 domingo 8 de julio de 2012

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SLIDE 17
  • Incomplete at low luminosity at low redshift (z<0.8)

because of the mass resolution Mhalo > 2.9×1011 M

  • Local luminosity & colour recipes + lightcone yields

wrong magnitudes at high redshift

  • Triaxial NFW (clusters?)
  • No shear errors

CURRENT CATALOGUE’s CAVEATS

17 domingo 8 de julio de 2012

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SLIDE 18

3072 Mpc/h / z ~1.4 DM particles mp~ 3 e10 Msun/h N=40963 Lightcone

( n

  • r

e p l i c a t i

  • n

)

Thanks for your attention!

18 domingo 8 de julio de 2012