Reference : Zooming into the broad line region of the gravitationally lensed quasar Q2237+0305 = ...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/80900
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
English
Sluse, Dominique mailto [> > > >]
Schmidt, R. [> > > >]
Courbin, F. [> > > >]
Hutsemekers, Damien mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Meylan, G. [> > > >]
Eigenbrod, A. [> > > >]
Anguita, T. [> > > >]
Agol, E. [> > > >]
Wambsganss, J. [> > > >]
1-Apr-2011
Astronomy and Astrophysics
EDP Sciences
528
A100, pp. 1-16
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] Astrophysics - Cosmology and Extragalactic Astrophysics ; gravitational lensing: micro ; quasars: emission lines
[en] Aims: We aim to use microlensing taking place in the lensed quasar Q2237+0305 to study the structure of the broad line region and measure the size of the region emitting the CIV and CIII] lines. Methods: Based on 39 spectrophotometric monitoring data points obtained between Oct. 2004 and Dec. 2007, we derive lightcurves for the CIV and CIII] emission lines. We use three different techniques to analyse the microlensing signal. Different components of the lines (narrow, broad and very broad) are identified and studied. We build a library of simulated microlensing lightcurves which reproduce the signal observed in the continuum and in the lines provided only the source size is changed. A Bayesian analysis scheme is then 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 is found 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 obtained for CIII]. Relative sizes of the V-band continuum and of the carbon line emitting regions are also derived with median values of R(line)/R(cont) in the range [4,29], depending of the FWHM of the line component. 2. The size of the CIV emitting region agrees with the Radius-Luminosity relationship derived from reverberation mapping. Using the virial theorem we derive 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 spatially distinct regions, the most compact one giving rise to the broadest component of the line. The broad and narrow line profiles are slightly different for CIV and CIII]. 4. Our analysis suggests a different structure of the CIV and FeII+III emitting regions, with the latter being produced in the inner part of the BLR or in a less extended emitting region than CIV.
Researchers
http://hdl.handle.net/2268/80900
10.1051/0004-6361/201016110
http://adsabs.harvard.edu/abs/2011A%26A...528A.100S
http://de.arxiv.org/abs/1012.2871

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
1012.2871v1.pdfAuthor preprint1.28 MBView/Open
Restricted access
2011A&A...528A.100S.pdfPublisher postprint1.72 MBRequest copy

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.