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Chromaticity Study in Q2237+0305

Chromaticity Study in Q2237+0305. Ana M. Mosquera with José A. Muñoz & Evencio Mediavilla. Searching for Strong Lenses Workshop, Fermilab, June 15th 2007. I-band image. Observations and analysis.

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Chromaticity Study in Q2237+0305

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  1. Chromaticity Study in Q2237+0305 Ana M. Mosquera with José A. Muñoz & Evencio Mediavilla Searching for Strong Lenses Workshop, Fermilab, June 15th 2007

  2. I-band image Observations and analysis • Object of study: quadruple quasar Q2237+0305 (Huchra et al. 1985) • zL= 0.039, zS= 1.695 • Observations: NOT (2.56 m) • Wavelength interval: 3510-8130 Å • Performed PSF photometry fitting • Derived the difference in magnitude between the four images • Studied chromaticity in the QSO

  3. Strömgren-y (l = 5470Å) Strömgren-b (l = 4670Å) Strömgren-u (l = 3510Å) Iac#29( l = 7015Å) Iac#28 (l = 6062Å) Strömgren-v (l = 4110Å) Ha (l = 6567Å) I-band (l = 8130Å) Q2237 + 0305 images

  4. I-band (l = 8130Å) Iac#29 (l = 7015Å) Ha (l = 6567Å) Iac#28 (l = 6062Å) Strömgren-y (l = 5470Å) Strömgren-b (l = 4670Å) Strömgren-v (l = 4110Å) Strömgren-u (l = 3510Å) Q2237+0305 images in the 8 different filters

  5. Q2237+0305 Modelled image Residuals Strömgren-u (= 3510Å)

  6. Quasar spectrumMicroamplification

  7. Data analysis (Mosquera et al. 2007, ApJ Letters to be submitted)

  8. OGLE´s light curve(http://www.astrouw.edu.pl/~ogle/ogle3/huchra.html)

  9. OGLE´s light curve(http://www.astrouw.edu.pl/~ogle/ogle3/huchra.html)

  10. Lightcurve Fitting

  11. Lightcurve Fitting (rs, b1, b2, t1, t2, A2, M )

  12. Q2237+0305(component A) =0.36 =0.40 ru=0.016 rE ry=0.033 rE

  13. Probability distributions Disk profile Gaussian profile

  14. Monitoring the system Aug. 2006

  15. Monitoring the system Sept. 2006

  16. Monitoring the system Nov. 2006

  17. Conclusions • Determined the existence of microlensing in the continuum and not in the emission lines for two images of the quasar . • Component A shows strong flux variation with wavelength which provides strong evidence of chromatic microlensing (two events). • Preliminary results on the lightcurve and chromaticity fittings which motivate us to explore other possibilities in order to constrain physical properties of the quasar accretion disk

  18. Current and Future work • Study the probability of chromatic microlensing (not only in this system). • Obtain a good temporal sampling for the chromatic microlensing in Q 2237+0305 . • Study the constraints imposed in the physical properties of the quasar accretion disk.

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