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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
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
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!!