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We aim to use microlensing taking place in the lensed quasar Q2237+0305 tostudy the structure of the broad line region and measure the size of the regionemitting the CIV and CIII] lines.  Methods: Based on 39 spectrophotometric monitoring data points obtainedbetween Oct. 2004 and Dec. 2007, we derived lightcurves for the CIV and CIII]emission lines. We used three different techniques to analyse the microlensingsignal. Different components of the lines (narrow, broad and very broad) areidentified and studied. We built a library of simulated microlensinglightcurves that reproduce the signal observed in the continuum and in thelines provided only the source size is changed. A Bayesian analysis scheme isthen developed to derive the size of the various components of the BLR.  Results: 1. The half-light radius of the region emitting the CIV line isfound to be R_CIV ~ 66^{+110}_{-46} lt-days = 0.06$^{+0.09}_{-0.04}$ pc =1.7$^{+2.8}_{-1.1}$\,10$^{17}$ cm (at 68.3% CI). Similar values are obtainedfor CIII]. Relative sizes of the carbon-line and V-band continuumemitting-regions are also derived with median values of R(line)/R(cont) in therange 4 to 29, depending of the FWHM of the line component.  2. The size of the CIV emitting region agrees with the Radius-Luminosityrelationship derived from reverberation mapping. Using the virial theorem wederive the mass of the black hole in Q2237+0305 to be M_BH ~ 10^{8.3+/-0.3}M_sun.  3. We find that the CIV and CIII] lines are produced in at least 2 spatiallydistinct regions, the most compact one giving rise to the broadest component ofthe line. The broad and narrow line profiles are slightly different for CIV andCIII].  4. Our analysis suggests a different structure for the CIV and FeII+IIIemitting regions, with the latter produced in the inner part of the BLR or in aless extended emitting region than CIV.

astronomy and astrophysics

Zooming into the broad line region of the gravitationally lensed quasar  Q2237+0305 = the Einstein Cross: III. Determination of the size and structure  of the CIV and CIII] emitting regions using microlensing