Reference : Multi-wavelength study of the gravitational lens system RXS J1131-1231 - III. Long sl...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/25398
Multi-wavelength study of the gravitational lens system RXS J1131-1231 - III. Long slit spectroscopy: micro-lensing probes the QSO structure
English
Sluse, Dominique [Laboratoire d'Astrophysique, École Polytechnique Fédérale de Lausanne (EPFL) Observatoire, 1290 Sauverny, Switzerland ; Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, B5C, 4000 Sart Tilman, Belgium]
Claeskens, Jean-François [Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, B5C, 4000 Sart Tilman, Belgium]
Hutsemekers, Damien mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Surdej, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Jun-2007
Astronomy and Astrophysics
EDP Sciences
468
3
885-901
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] gravitational lensing ; galaxies : Seyfert
[en] Aims. We discuss and characterize micro-lensing among the 3 brightest lensed images (A-B-C) of the gravitational lens system RXS J1131-1231 (a quadruply imaged AGN) by means of long slit optical and NIR spectroscopy. Qualitative constraints on the size of different emission regions are derived. We also perform a spectroscopic study of two field galaxies located within 1.6 arcmin radius from the lens. Methods. We decompose the spectra into their individual emission components using a multi-component fitting approach. A complementary decomposition of the spectra enables us to isolate the macro-lensed fraction of the spectra independently of any spectral modelling. Results. 1. The data support micro-lensing de-amplification of images A and C. Not only is the continuum emission microlensed in those images but also a fraction of the Broad Line emitting Region (BLR). 2. Micro-lensing of a very broad component of Mg II emission line suggests that the corresponding emission occurs in a region more compact than the other components of the emission line. 3. We find evidence that a large fraction of the Fe II emission arises in the outer parts of the BLR. We also find a very compact emitting region in the ranges 3080-3540 angstrom and 4630-4800 angstrom that is likely associated with Fe II. 4. The [O III] narrow emission line regions are partly spatially resolved. This enables us to put a lower limit of similar to 110h(-1) pc on their intrinsic size. 5. Analysis of Mg II absorption found in the spectra indicates that the absorbing medium is intrinsic to the quasar, has a covering factor of 20%, and is constituted of small clouds homogeneously distributed in front of the continuum and BLRs. 6. Two neighbour galaxies are detected at redshifts z = 0.10 and z = 0.289. These galaxies are possible members of galaxy groups reported at those redshifts.
Researchers ; Professionals
http://hdl.handle.net/2268/25398
10.1051/0004-6361:20066821
http://adsabs.harvard.edu/abs/2007A%26A...468..885S
http://de.arxiv.org/abs/astro-ph/0703030
The authors thank SAO/NASA ADS Astronomy Abstract Service for their deposit authorization. The original publication is available at http://www.aanda.org/.

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
Sluse_A&A_2007_468_885_901.pdfNo commentaryPublisher postprint1.05 MBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.