COSMOS : Strong Lens Candidate

Transcription

1 COSMOS : Strong Lens Candidate Timo Anguita Astronomisches Rechen-Institut Zentrum für Astronomie der Universität Heidelberg with: C. Faure (EPFL) J.-P. Kneib (LAM) J. Wambsganss (ARI/ZAH) C. Knobel (ETH) A. Koekemoer (STScI)

2 Outline The system Photometry and astrometry Mass modeling Environment Flux ratio anomalies Summary / Future

3 COSMOS Field 1.4 x1.4 EB-V 0.2 mag RA=10h00m Dec=02 12'' Radio to Xray ~70 strong lens candidates (Faure et al. 2008)

4 09 59, 02 06'' h 1.4 x1.4 EB-V 0.2 mag RA=10h00m Dec=02 12'' Radio to Xray m ~70 strong lens candidates (Faure et al. 2008)

5 09 59, 02 06'' h m

6 The System 4 point like images Central elliptical galaxy Faint ring Data COSMOS Subaru and CFHT (2004) ACS F814W (2004) WFPC2 F606W (SL2S 2008) FORS2 MOS (follow-up 2008) zl=0.551 zs=3.14

7 Fitting the System Original De Vaucouleurs profile for the central galaxy 4 point sources Galaxy parameters fixed with ACS data Fitted Residual

8 Fitting the System Original Fitted Residual De Vaucouleurs profile for the central galaxy 4 point sources Galaxy parameters fixed with ACS data Central galaxy Point-like images mf814w=20.31± >m814W>24.5 mf606w=21.72± >m606W>24.5 ER=0.71''

9 Mass modeling Lenstool (Kneib et al. 96, Jullo et al. 07) Singular Isothermal Ellipsoid + shear ( ( 1) Vel disp = km/s Shear strength = Shear direction = Time delay order: C-->A-->B-->D 0.2 days < TD < 7 days Mlens 1.2x1011 M M/L 8.5 M /L (ER=0.71''-->4.5kpc) A 40, 65, C 32, D 15 abs mag~-17.5!!

10 Mass modeling Lenstool (Kneib et al. 96, Jullo et al. 07) Singular Isothermal Ellipsoid + shear ( ( 1) Vel disp = km/s Shear strength = Shear direction = Time delay order: C-->A-->B-->D 0.2 days < TD < 7 days Mlens 1.2x1011 M M/L 8.5 M /L (ER=0.71''-->4.5kpc) A 40, 65, C 32, D 15 abs mag~-17.5!!

11 Environment: Groups zcosmos group catalogue (Knobel et al ApJ accepted) Central positions Virial Mass Virial Radius = =

12 Flux ratios Theoretical and observational flux ratios disagree Different bands at different epochs! Possibilities Dust extinction Static Substructure Intrinsic Variability Microlensing Dynamic

13 Summary / Future Quadruply lensed Low Luminosity AGN Mass independent from environment Weak requirement of external shear no strong L.O.S contribution study stellar / mass distribution Environmental analysis of the full COSMOS lens sample (Faure et al in prep.) Flux anomalies Microlensing--> LLAGN physical structure! Gal. Ext. / Substructure? Further observations will confirm

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15 Mass modeling Lenstool (Kneib et al. 96, Jullo et al. 07) Singular Isothermal Ellipsoid + shear ( ( 1) Vel disp = km/s Shear strength = Shear direction = Time delay order: C-->A-->B-->D 0.2 days < TD < 7 days Mlens 1.2x1011 M M/L 8.5 M /L (ER=0.71''-->4.5kpc) A 40, 65, C 32, D 15 abs mag~-17.5!!

16 Mass modeling Lenstool (Kneib et al. 96, Jullo et al. 07) Singular Isothermal Ellipsoid + shear ( ( 1) Vel disp = km/s Shear strength = Shear direction = Time delay order: C-->A-->B-->D 0.2 days < TD < 7 days Mlens 1.2x1011 M M/L 8.5 M /L (ER=0.71''-->4.5kpc) A 40, 65, C 32, D 15 abs mag~-17.5!!

17 Mass modeling Lenstool (Kneib et al. 96, Jullo et al. 07) Singular Isothermal Ellipsoid + shear ( ( 1) Vel disp = km/s Shear strength = Shear direction = Time delay order: C-->A-->B-->D 0.2 days < TD < 7 days Mlens 1.2x1011 M M/L 8.5 M /L (ER=0.71''-->4.5kpc) A 40, 65, C 32, D 15 abs mag~-17.5!!

18 Mass modeling Lenstool (Kneib et al. 96, Jullo et al. 07) Singular Isothermal Ellipsoid + shear ( ( 1) Vel disp = km/s Shear strength = Shear direction = Time delay order: C-->A-->B-->D 0.2 days < TD < 7 days Mlens 1.2x1011 M M/L 8.5 M /L (ER=0.71''-->4.5kpc) A 40, 65, C 32, D 15 abs mag~-17.5!!

19 Mass modeling Lenstool (Kneib et al. 96, Jullo et al. 07) Singular Isothermal Ellipsoid + shear ( ( 1) Vel disp = km/s Shear strength = Shear direction = Time delay order: C-->A-->B-->D 0.2 days < TD < 7 days Mlens 1.2x1011 M M/L 8.5 M /L (ER=0.71''-->4.5kpc) A 40, 65, C 32, D 15 abs mag~-17.5!!