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Large Scale Structure in 2MRS & 6dF

Dive into the study of galaxy clustering and velocity flows using the 2MRS and 6dF datasets, revealing insights into cosmic web dynamics, halo modeling, and spectral classification. Explore future work and interests in cosmological parameters and more at the University College London workshop.

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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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