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Small-scale and Large-scale Clustering of LRGs: BAO and ISW Results Summary

Explore SDSS, 2SLAQ, and AAOmega survey results on gravitational lensing using w(θ) for LRGs with color-cuts. Analyze BAO peaks and ISW effects in large and small-scale LRG clustering data. Investigate potential SZ detections at z~0.7. Preliminary findings suggest possible ISW signals at z~0.35 and z~0.55.

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Small-scale and Large-scale Clustering of LRGs: BAO and ISW Results Summary

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  1. BAO,ISW+SZ from AA+SDSS Utane Sawangwit, Tom Shanks, Durham University + 2SLAQ + AAOmega teams

  2. Summary • SDSS, 2SLAQ + AAOmega LRG z surveys • AAOmega photo-z LRG small scale clustering results • AAOmega photo-z LRG BAO results • AAOmega photo-z LRG ISW results • AAOmega photo-z LRG + ACO SZ results • All results preliminary!!!!

  3. 2SLAQ LRG Wedge Plot

  4. AAOmega • AAOmega is the new spectrograph for AAT 2dF • 392 fibres • Blue and Red Arm • AAOmega pilot in March 2006 to survey riz selected LRGs to z~0.9

  5. 1.5 million SDSS LRGs • SDSS, 2SLAQ LRGs use gri colour-cuts • AAOmega LRGs use riz colour-cuts • Simply use w(θ) on colour-cut LRGs rather than photo-z • w(θ) for three z bins: • 100000 z~0.35 LRGs • 600000 z~0.55 LRGs • 800000 z~0.7 LRGs

  6. Small-scale LRG clustering SDSS 2SLAQ AA

  7. Large-scale LRG clustering Are these BAO peaks or just some systematics?

  8. This is the scale where we expect to see BAO peak

  9. linear no wiggle linear no wiggle SDSS (s) fit SDSS (s) fit Combined w() results 3-D SDSS correlation function, (s) from 45000 LRGs (Eisenstein et al 2005) 2-D correlation function from 1.5 million DR5 LRGs (this work)

  10. Linear theory SDSS (s) fit “Filtered” w() - final result? • But constant offset at large scales • Systematics? • Subtract 0.0015 from w() to “filter” • Now agrees with linear theory • But poorer agreement with SDSS (s) of Eisenstein et al

  11. 2dFGRS BAO? • So photo-z route to BAO is hard… • But so is spectro-z route!

  12. linear no wiggle linear no wiggle SDSS (s) fit SDSS (s) fit LRG-WMAP ISW

  13. linear no wiggle linear no wiggle SDSS (s) fit SDSS (s) fit LRG-WMAP ISW

  14. LRG-WMAP Ka-band ISW?

  15. LRG-WMAP K-band ISW?

  16. LRG-WMAP Q-band ISW?

  17. LRG-WMAP V-band ISW?

  18. LRG-WMAP W-band ISW?

  19. LRG-WMAP ILC ISW? ILC 2SLAQ AA SDSS

  20. AA LRG clusters +WMAP WSZ? • 10x the negative amplitude seen in ISW-LRG plot • Possible SZ detection at z~0.7?

  21. Z~0.1 Z=0.02 Coma cluster 172 Abell Clusters (arcmin) Z~0.2 Z~0.4 235 Abell Clusters 38 OVRO/BIMA Clusters Abell cluster + WMAP  SZ T WMAP SZ at 94GHz SZ effect decreases with z? Bielby + Shanks 2007 astro-ph/ 0703407

  22. Conclusions • SDSS colour cut LRGs at z~0.35 (SDSS), z~0.55 (2SLAQ) and z~0.7 (AAOmega) • Small-scale (~1Mpc) feature confirmed in w() - important for HOD models and LRG evolution • w() of 1.5x106 SDSS LRGs close to detecting BAO - more LRGs to come from VST ATLAS • Possible ISW detections at z~0.35 and z~0.55 but only anti-correlation detected at z~0.7 • Possible SZ detection at small-scales at z~0.7 • All results preliminary!!!

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