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COSMOS 5921+0638: 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)

COSMOS 5921+0638: Strong Lens Candidatewucknitz/jenam2009/files/anguita.pdf · COSMOS 5921+0638: Strong Lens Candidate Timo Anguita Astronomisches Rechen-Institut Zentrum für Astronomie

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COSMOS 5921+0638: Strong Lens Candidate

Timo AnguitaAstronomisches 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)

Three decades of lensing--JENAM09

Outline

The system

Photometry and astrometry

Mass modeling

Environment

Flux ratio anomalies

Summary / Future

Three decades of lensing--JENAM09

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)

Three decades of lensing--JENAM09

09h59m, 02°06''

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)

Three decades of lensing--JENAM09

09h59m, 02°06''

Three decades of lensing--JENAM09

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

Three decades of lensing--JENAM09

Fitting the System

De Vaucouleurs profile for the central galaxy

4 point sources

Galaxy parameters fixed with ACS data

Original Fitted Residual

Three decades of lensing--JENAM09

Fitting the System

De Vaucouleurs profile for the central galaxy

4 point sources

Galaxy parameters fixed with ACS data

Point-like images

26.2>m814W>24.5

26.5>m606W>24.5

ER=0.71''

Central galaxy

mF814W=20.31±0.01

mF606W=21.72±0.02

Original Fitted Residual

Three decades of lensing--JENAM09

Mass modeling Lenstool (Kneib et al. 96, Jullo et al. 07)

Singular Isothermal Ellipsoid + shear ((≈1)

Vel disp=189.3 0.2 km/s

Shear strength=0.056 0.003

Shear direction=106.91° 1.52°

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!!

Three decades of lensing--JENAM09

Mass modeling Lenstool (Kneib et al. 96, Jullo et al. 07)

Singular Isothermal Ellipsoid + shear ((≈1)

Vel disp=189.3 0.2 km/s

Shear strength=0.056 0.003

Shear direction=106.91° 1.52°

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!!

Three decades of lensing--JENAM09

Environment: Groups zCOSMOS group

catalogue (Knobel et al. 2009 ApJ accepted)

Central positions

Virial Mass

Virial Radius

=0.056 0.003=106.91° 1.52°

Three decades of lensing--JENAM09

Flux ratios

Theoretical and observational flux ratios disagree

Different bands at different epochs!

Possibilities

Dust extinction

Substructure

Intrinsic Variability

Microlensing

Static

Dynamic

Three decades of lensing--JENAM09

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. 2009 in prep.)

Flux anomalies

Microlensing--> LLAGN physical structure!

Gal. Ext. / Substructure?

Further observations will confirm

Three decades of lensing--JENAM09

Three decades of lensing--JENAM09

Mass modeling Lenstool (Kneib et al. 96, Jullo et al. 07)

Singular Isothermal Ellipsoid + shear ((≈1)

Vel disp=189.3 0.2 km/s

Shear strength=0.056 0.003

Shear direction=106.91° 1.52°

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!!

Three decades of lensing--JENAM09

Mass modeling Lenstool (Kneib et al. 96, Jullo et al. 07)

Singular Isothermal Ellipsoid + shear ((≈1)

Vel disp=189.3 0.2 km/s

Shear strength=0.056 0.003

Shear direction=106.91° 1.52°

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!!

Three decades of lensing--JENAM09

Mass modeling Lenstool (Kneib et al. 96, Jullo et al. 07)

Singular Isothermal Ellipsoid + shear ((≈1)

Vel disp=189.3 0.2 km/s

Shear strength=0.056 0.003

Shear direction=106.91° 1.52°

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!!

Three decades of lensing--JENAM09

Mass modeling Lenstool (Kneib et al. 96, Jullo et al. 07)

Singular Isothermal Ellipsoid + shear ((≈1)

Vel disp=189.3 0.2 km/s

Shear strength=0.056 0.003

Shear direction=106.91° 1.52°

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!!

Three decades of lensing--JENAM09

Mass modeling Lenstool (Kneib et al. 96, Jullo et al. 07)

Singular Isothermal Ellipsoid + shear ((≈1)

Vel disp=189.3 0.2 km/s

Shear strength=0.056 0.003

Shear direction=106.91° 1.52°

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!!