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Host VS. Subhalo profile—Galaxy-galaxy lensing

W.T.Luo (SHAO) X.H.Yang(SHAO), H.J.Mo(UMASS),F. van den Bosch(Yale), L.P.Fu(INFA), C.G.Shu(SHNU), M. Rodvich(INFA). Host VS. Subhalo profile—Galaxy-galaxy lensing. OUTLINE. What are we going to do? What has been done? What are we doing? Summary. What are we going to do?.

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Host VS. Subhalo profile—Galaxy-galaxy lensing

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  1. W.T.Luo (SHAO) X.H.Yang(SHAO), H.J.Mo(UMASS),F. van den Bosch(Yale), L.P.Fu(INFA), C.G.Shu(SHNU), M. Rodvich(INFA) Host VS. Subhalo profile—Galaxy-galaxy lensing

  2. OUTLINE • What are we going to do? • What has been done? • What are we doing? • Summary

  3. What are we going to do? • Group catalogue from SDSS DR4 (Yang et al 2005a; Yang et al 2007 )

  4. Galaxy-Galaxy Lensing

  5. What are We Going to Do ? • Central and satellite galaxies as lenses (Yang et al 2003a; Yang et al 2006;Yang et al 2007)

  6. What has been done? • SDSS data (York et al 2000; Gunn et al 1998; Gunn et al 2003)

  7. e1_psf=0.11 0.01

  8. What are we doing now? • STEP2 simulated data • Recent results

  9. Shear TEsting Program ﹜→ Shear sky PSF → star images

  10. Shear TEsting Program 2 • 6 PSFs A~F • 64 different shear from 0.00~0.06 • Shapelets ( Massey et al 2004a ) • SUBARU r band (~26.0) (Miyazaki et al 2002b) • More demanding than STEP1 Complex morphologies Galaxy size Galaxy magnitude PSF size and ellipticity

  11. Shear TEsting Program 2

  12. PSFs ______________________________________________________________________________________________________________________ ___________________________________________________________

  13. Recent Results M=-0.037 C=0.0006 PSF F

  14. Recent Results M=-0.026 C=-0.0012 PSF C

  15. Recent Results M=-0.13 C=0.0003 PSF D

  16. Summary • Part I 1,SDSS ellipticity parameters are not accurate for G-G lensing 2,Testing our pipeline using STEP2 • Part II 1,Central & satellite galaxy—halo profile 2,Improve our pipeline 3,PHOTO VS. SEXTRACTOR 4,Jun Zhang 2010

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