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OWLS REPORT

OWLS REPORT. DES Cluster Simulations Monday, 11/24/08. Outline. Simulated Cluster Properties 2D ellipticity average plots 1D profiles PSF removal issues Next steps. Cluster Properties. Cluster is taken from R. Wechsler’s catalog, and is similar to A611:

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OWLS REPORT

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  1. OWLS REPORT DES Cluster Simulations Monday, 11/24/08

  2. Outline • Simulated Cluster Properties • 2D ellipticity average plots • 1D profiles • PSF removal issues • Next steps

  3. Cluster Properties • Cluster is taken from R. Wechsler’s catalog, and is similar to A611: • redshift = 0.329814 (z_A611 = 0.288) • M200 = 8.3 x 10^14 M_solar (M_A611 = 9.4 x 10^14 M_solar) • Sigma_v = 1250 km/sec • Bkgd galaxies: from z = 0.4 to 1.4 • Shear applied only for gamma < 0.2 (out past ~400 pixels = 80” = 72 kpc for z=0.3)

  4. Simulation File Attributes Sheared Noisy PSF

  5. DES Focal Plane 31 38 18 24 44 50 • 62 chips arranged as below; cluster is placed at center of chip 28 30 37 55 12 7 17 43 49 23 59 11 29 36 54 62 3 16 22 6 42 48 58 10 2 28 35 53 61 15 21 41 47 5 57 1 9 27 34 52 60 4 14 20 40 46 56 8 51 26 33 39 45 13 19 25 32

  6. Simulation Images (central section of chip 28)Note increase in realism, 3-->7 3 4 5 7 6

  7. Simulation Attributes(Mag vs Fwhm) File 6 File 7 File 3 (See backup slides for mag vs. magerror, And mag vs. nu = S/N plots)

  8. 2D – Ellipticity Plots (sextractor averages by chip; shapelets and imcat agree) 4 5 3 6 7

  9. 2D – Ellipticity Plot: File3_minus_File4 Take file 3 ellipticity minus that of file 4 – removes `residual psf’ (currently being looked into by H.Lin), and again average inside each chip and plot – see clear cluster signal now

  10. One Dimensional Profiles: take annular averages as normal Note: clear E-mode profile from file3 – PSF has been averaged out -- but file4 is consistent with zero, as are both B-modes, which match, indicating they are deriving from the same underlying PSF structure.

  11. One-D Profiles: Files 3-7, E and B modes File 3, E-mode File 5, E-mode Other Files, E and B modes

  12. One-D Profiles: Files 3-7, E modes only File 3, E-mode File 5, E-mode

  13. Redshift dists for File 3 File5 truth-sexcat match

  14. One-D Profiles: Files 3 and File3_minus_File4, E modes only Nearly perfect a/x profile for 3minus4, consistent with File 3 averages for imcat and shapelets B-modes all consistent with zero

  15. Profiles from Truth Table (H.Lin) (z-corrected)

  16. Our Profiles from Truth Table (Chip 28)

  17. PSF: FWHM of 10 stars as a function of y-position (Given PSF compared with averages of stars from first 10 files)

  18. PSF: Ellips of 10 stars as a function of y-position (Given PSF compared with averages of stars from first 10 files)

  19. Next Steps • Get corrected truth tables (or possibly files) for Files 5,6,7 from H.Lin • Understand discrepancy in Given PSF and our computed one. • Do redshift correction on shear • Fit shear • Extract profile fit -> sigmav2 -> M200 • Do PSF deconvolution and compare gamma (imcat) and gksb (shapelets) with sextractor ellipticities • Do: Bootstrap; Mag , FWHM, PSF cut studies as we’ve done on A611 • Go back to A611 and actually finalize M200, R200 values, NFW fit. Also: MS1358, then 2008 clusters

  20. BACKUP SLIDES

  21. Mag vs. Magerr; Files 3 and 6

  22. S/N vs. Mag; Files 3 and 6

  23. Shlets: gksb

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