laboratoire d’astrophysique ecole polytechnique fédérale de lausanne switzerland the energy...
DESCRIPTION
Motivation Use chromatic microlensing to constraint the energy profile Use chromatic microlensing to constraint the energy profile of quasar accretions disks of quasar accretions disks Requires: Requires: clear microlensing events clear microlensing events remove the time delay effect remove the time delay effect good sampling over several years good sampling over several years broad wavelength coverage broad wavelength coverage deblend the quasar images and the lensing galaxy deblend the quasar images and the lensing galaxy accurate flux calibration over the whole monitoring accurate flux calibration over the whole monitoringTRANSCRIPT
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Laboratoire d’Astrophysique Laboratoire d’Astrophysique Ecole Polytechnique Fédérale de Ecole Polytechnique Fédérale de
LausanneLausanneSwitzerlandSwitzerland
The energy profile of the accretion disk in Q2237+030 from 3.0 years of VLT spectro-
photometric monitoringFrédéric CourbinFrédéric Courbin
withwith
A. Eigenbrod, G. Meylan, D. Sluse (EPFL)A. Eigenbrod, G. Meylan, D. Sluse (EPFL)E. Agol (University of Washington)E. Agol (University of Washington)
T. Anguita, R. Schmidt, J. Wambsganss (ARI, T. Anguita, R. Schmidt, J. Wambsganss (ARI, Heidelberg)Heidelberg)
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Q2237+080 is ideal for microlensing studies
VLT/FORS1 « snapshot » of the Einstein Cross in the R-band
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(Wozniak et al. 2000, Uldalski et al. 2008 + recent update)
OGLE V-band light curves from 1998 to 2008
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(Wozniak et al. 2000, Uldalski et al. 2008 + recent update)
OGLE V-band light curves from 1998 to 2008
2005
our VLT spectroscopy
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Spatial direction
Spectral direction
Multiple slits
Gravitational lens
L
Courbin et al. 2000, ApJ 1136, 529Courbin et al. 2000, ApJ 1136, 529
slit 1
slit 2
Two masks per epochTwo masks per epoch
15 days between 2 epochs15 days between 2 epochs
4000-8000 Å4000-8000 Å
0.7” slit0.7” slit
RR~400 (2.7 ~400 (2.7 Å per pixelÅ per pixel))
Seeing < 0.8 arcsecSeeing < 0.8 arcsec
Exp. Time: 1620 sExp. Time: 1620 s
42 epochs in total42 epochs in total
Extracting the quasar spectra Extracting the quasar spectra
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Example of a spectrum taken in mask1 (comps. A+D)
Seeing ~ 0.8”
FWHM ~ 0.2”
Components A+D alone
Lensing galaxy alone
Spatial deconvolution
+
Extracting the quasar spectra Extracting the quasar spectra
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Extracting the quasar spectra Extracting the quasar spectra
data lens
A+D deconvolved
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Flux cross-calibration between epochs
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Flux cross-calibration between epochs
In addition FORS1 on the VLT has an atmospheric refraction corrector
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Sanity check using the OGLE photometry
+ the spectrum of the lens galaxy in the two masks are identical
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Last step: decomposition of the 1D spectra
Sum of Gaussian emission lines + power law continuum+ template for the iron optical emission (from Vestergaard 2001)
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Image AEinstein Cross:
time
Flux
2005 2006 2007
A
Chromatic variations in the continuum
VLT FORS1 R-band
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Image AEinstein Cross:
time
Flux
2005 2006 2007
A
Intensity and profile variations of the BELs
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Microlensing simulations
• Convergence and shear from Kochanek (2004)Convergence and shear from Kochanek (2004)
• <M> = 0.1 M<M> = 0.1 M (results not sensitive to the mass (results not sensitive to the mass function)function)
• Microlensing patterns with 10000 x 10000 pixels: 100 Microlensing patterns with 10000 x 10000 pixels: 100 RREE
• 101011 11 ray shootings ray shootings
• We fit We fit difference light curvesdifference light curves in six bands (continuum in six bands (continuum only)only)
1- remove the intrinsic variations1- remove the intrinsic variations
2- not sensitive to differential extinction2- not sensitive to differential extinction
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Microlensing simulations
Multiband (200Å) light Multiband (200Å) light curves for the continuum curves for the continuum (A-B)(A-B)
Fit to the V-band OGLE Fit to the V-band OGLE difference light curve (A-difference light curve (A-B)B)
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Microlensing simulations
• Source shape is Gaussian (but unimportant)Source shape is Gaussian (but unimportant)
• Choose 45 different source sizes:Choose 45 different source sizes:
0.01 R0.01 RE E < R < R < 4 R< 4 REE
• For the 45 sizes, sample the source plane with 10000 For the 45 sizes, sample the source plane with 10000 light light curves that fit well the OGLE datacurves that fit well the OGLE data
• Library of 45000 “good” trajectories to carry out Library of 45000 “good” trajectories to carry out BayesianBayesian analysis similar to Kochanek (2004) and Anguita et al. analysis similar to Kochanek (2004) and Anguita et al. (2008)(2008)
• Find the best source size for each wavelength, i.e., Find the best source size for each wavelength, i.e., peak of peak of the probability distribution in radiithe probability distribution in radii
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Microlensing simulations
Linear regression to the data gives Linear regression to the data gives =1.2±0.3=1.2±0.3
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Main results
• 42-epochs VLT spectra of the 4 individual quasar images42-epochs VLT spectra of the 4 individual quasar images
• Observations from Oct. 2004 to Dec. 2007Observations from Oct. 2004 to Dec. 2007
• S/NS/N~100 over 4000-8000 Å~100 over 4000-8000 Å
• Energy profile is proportional to Energy profile is proportional to 1.2±0.31.2±0.3
• Energy profile without velocity prior Energy profile without velocity prior 1.1±0.31.1±0.3
• Best compatible with prediction from Shakura-Sunyaev Best compatible with prediction from Shakura-Sunyaev (1.3)(1.3) and Agol and Krolik (2000)and Agol and Krolik (2000)
• The Broad Emission Line also vary, both in intensity and The Broad Emission Line also vary, both in intensity and profileprofile
• High ionisation lines vary more than low ionisation lines, High ionisation lines vary more than low ionisation lines, in in agreement with reverberation mapping studies agreement with reverberation mapping studies
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Main results
Observational details in Paper I: Observational details in Paper I:
Eigenbrod, Courbin, Sluse, Meylan, Agol, 2008, A&A 480, Eigenbrod, Courbin, Sluse, Meylan, Agol, 2008, A&A 480, 647647
Microlensing simulations in Paper II:Microlensing simulations in Paper II:
Eigenbrod, Courbin, Meylan, Agol, Anguita, Schmidt, Eigenbrod, Courbin, Meylan, Agol, Anguita, Schmidt, WambsganssWambsganss(accepted in A&A, (accepted in A&A, arXiv:0810.0011, today))
VLT monitoring of RXJ1131-123 has startedVLT monitoring of RXJ1131-123 has started
PI: SlusePI: Sluse
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Questions
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Questions
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Questions
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Questions