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Large Scale Structure in 2MRS & 6dF

Large Scale Structure in 2MRS & 6dF. Ofer Lahav (University College London). 6dF workshop, AAO/Sydney, 26-27 April 2005. LSS in 2MRS. The Local Group Dipole Wiener reconstruction Future work with 2MRS+2MASS+6dF Pirin Erdogdu (Cambridge/Ankara),

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Large Scale Structure in 2MRS & 6dF

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  1. Large Scale Structure in 2MRS & 6dF Ofer Lahav (University College London) 6dF workshop, AAO/Sydney, 26-27 April 2005

  2. LSS in 2MRS • The Local Group Dipole • Wiener reconstruction • Future work with 2MRS+2MASS+6dF Pirin Erdogdu (Cambridge/Ankara), John Huchra (CfA), Ofer Lahav (UCL) & the 2MRS/6dF teams

  3. The Near IR Local Universe

  4. 2MRS + mock ZoA Random ZoA ~25000 galaxies Ks < 11.25 Huchra & 2MRS/6dF teams Interpolated ZoA

  5. 2MRS vs. PSCz radial selection fn

  6. Spectral PCA types in 2MASS 62% E’s in 2MASS 35% E’s in 2dF Madgwick, OL et al.

  7. Dipole – weighting schemes =m0.6/b g / <M/L> L/ (4  r2) L = (7.67+- 1.02) x 108 L_sun h Mpc-3

  8. Number and Flux dipolesin the LG frame • < 0.57 +- 0.07 b2mrs > 0.85 +- 0.15 (for m = 0.30) m < 0.37+- 0.20 15o @ 50 Mpc/h 24o @ 130 Mpc/h Erdogdu et al., In preparation

  9. Out to 200 Mpc/h – CMB frame

  10. Dipole – Wiener reconstruction =0.4 =0.6

  11. 2MRS dipole directions @ 130 Mpc/h

  12. Spherical harmonics

  13. Wiener filtering Redshift distortion Signal/(Signal+Noise) ) Fisher, OL et al (1995)

  14. WF 2MRS @ 2000 km/sec Erdogdu et al.

  15. WF 2MRS @ 4000 km/sec

  16. WF 2MRS @ 6000 km/sec

  17. WF 2MRS @ 10000 km/sec

  18. WF 2MRS velocity fieldCMB frame Erdogdu et al.

  19. WF 2MRS velocity fieldLG frame

  20. The Concordance Model • Bulk flows are expected to have in linear theory: • For m < 1 lower amplitude and larger coherence length than in m=1 universe • Bulk flows are not sensitive to Dark Energy

  21. Photometric redshifts

  22. Photometric redshifts

  23. Photo-z Other work: * HYPERZ: Bolozonella et al., 2000, A&A, 363, 476 * Csabai et al,. 2003, AJ, 125, 580 ANNz: * Firth, Lahav & Somerville, 2003, MNRAS, 339, 1195 * Collister & Lahav, 2004, PASP, 116, 345 http://www.ast.cam.ac.uk/~aac Applications to: SDSS LRGs, Dark Energy Survey, 2MASS, …

  24. Artificial Neural Network Output: redshift Input: magnitudes

  25. SDSS data (ugriz; r < 17.77) ANNz (5:10:10:1) HYPERZ

  26. 2MASS + photo-z z = 0.02 Collister & Lahav, ANNz z=0 cyan z=0.05 yellow z=0.08 red

  27. Future work and interests @ London • Compare predicted 2MRS peculiar velocities with observed 6dF pec vel. • Combine 2MRS with 2MASS photo-z and 6dF • Cosmological parameters • Halo model & biasing • The cosmic web • Galaxy spectral classification Alexandra Abate, Sarah Bridle, Ofer Lahav, Anais Rassat

  28. Clustering of Red vs. Blue 2dF galaxies Madgwick, Hawkins, Lahav & 2dFGRS team, astro-ph/0303668

  29. Great Walls of the Universe

  30. Ratio of bulk flows with massive neutrinos  =0.04 Elgaroy&Lahav, NJP, 2005

  31. Non-linear clustering P(k) = Plin(k) + Phalo(k) An empirical test of the halo model Co-added profile of 2dF groups Truncated NFW fit with C = 2.4 +- 0.3 A. Collister & OL, astro-ph/0412516

  32. Future work and interests @ UCL • Compare predicted 2MRS peculiar velocities with observed 6dF pec vel. • Combine 2MRS with 2MASS photo-z and 6dF • Cosmological parameters • Halo model & biasing • The cosmic web • Galaxy spectral classification Alexandra Abate, Sarah Bridle, Ofer Lahav, Anais Rassat

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