Article (Scientific journals)
First case of strong gravitational lensing by a QSO: SDSS J0013+1523 at z = 0.120
Courbin, F.; Tewes, M.; Djorgovski, S. G. et al.
2010In Astronomy and Astrophysics, 516, p. 12
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Keywords :
gravitational lensing: strong; quasars: individual: SDSS J0013+1523; dark matter
Abstract :
[en] We present the first case of strong gravitational lensing by a QSO: SDSS J0013+1523 at z = 0.120. The discovery is the result of a systematic search for emission lines redshifted behind QSOs, among 22 298 spectra of the SDSS data release 7. Apart from the z = 0.120 spectral features of the foreground QSO, the spectrum of SDSS J0013+1523 also displays the [O ii] and Hβ emission lines and the [O iii] doublet, all at the same redshift, z = 0.640. Using sharp Keck adaptive optics K-band images obtained using laser guide stars, we unveil two objects within a radius of 2” from the QSO. Deep Keck optical spectroscopy clearly confirms one of these objects at z = 0.640 and shows traces of the [O iii] emission line of the second object, also at z = 0.640. Lens modeling suggests that they represent two images of the same z = 0.640 emission-line galaxy. Our Keck spectra also allow us to measure the redshift of an intervening galaxy at z = 0.394, located 3.2”, away from the line of sight to the QSO. If the z = 0.120 QSO host galaxy is modeled as a singular isothermal sphere, its mass within the Einstein radius is M[SUB]E[/SUB](r < 1 h[SUP]-1[/SUP] kpc) = 2.16 × 10[SUP]10[/SUP] h[SUP]-1[/SUP] M[SUB]⊙[/SUB] and its velocity dispersion is σ[SUB]SIS[/SUB] = 169 km s[SUP]-1[/SUP]. This is about 1-σ away from the velocity dispersion estimated from the width of the QSO Hβ emission line, σ[SUB]*[/SUB](M[SUB]BH[/SUB])= 124 ± 47 km s[SUP]-1[/SUP]. Deep optical HST imaging will be necessary to constrain the total radial mass profile of the QSO host galaxy using the detailed shape of the lensed source. This first case of a QSO acting as a strong lens on a more distant object opens new directions in the study of QSO host galaxies. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. This program also makes use of the data collected by the SDSS collaboration and released in DR7.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Courbin, F.;  Laboratoire d'astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290 Versoix, Switzerland
Tewes, M.;  Laboratoire d'astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290 Versoix, Switzerland
Djorgovski, S. G.;  Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
Sluse, Dominique  ;  Ecole Polytechnique Fédérale de Lausanne - EPFL > LASTRO
Mahabal, A.;  Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
Rérat, F.;  Laboratoire d'astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290 Versoix, Switzerland
Meylan, G.;  Laboratoire d'astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290 Versoix, Switzerland )
Language :
English
Title :
First case of strong gravitational lensing by a QSO: SDSS J0013+1523 at z = 0.120
Publication date :
01 June 2010
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
516
Pages :
L12
Peer reviewed :
Peer Reviewed verified by ORBi
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