Reference : QSO mass constraints from gravitational lensing studies of quasar pairs. The cases of Q1...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/16694
QSO mass constraints from gravitational lensing studies of quasar pairs. The cases of Q1548+114 A & B and Q1148+0055 A & B
English
Claeskens, Jean-François [Université de Liège, Institut d'Astrophysique et de Géophysique, Avenue de Cointe 5, 4000 Liège, Belgium]
Lee, D.-W. [Université de Liège, Institut d'Astrophysique et de Géophysique, Avenue de Cointe 5, 4000 Liège, Belgium]
Remy, M. [Institut d'Astrophysique et de Géophysique, Avenue de Cointe 5, 4000 Liège, Belgium > > > >]
Sluse, D. [Université de Liège, Institut d'Astrophysique et de Géophysique, Avenue de Cointe 5, 4000 Liège, Belgium]
Surdej, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
2000
Astronomy and Astrophysics
EDP Sciences
356
840-848
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] GALAXIES: QUASARS: GENERAL ; GALAXIES: QUASARS: INDIVIDUAL: Q1548+114 A&B ; GALAXIES: QUASARS: INDIVIDUAL: Q1148+005 A&B ; COSMOLOGY: GRAVITATIONAL LENSING
[en] New constraints on the mass of quasars are derived from gravitational lensing studies of the QSO pairs Q1548+114 A & B and Q1148+0055 A & B, for which new ground-based and Hubble Space Telescope (HST) direct imagery have been obtained. In the case of Q1548+114 A & B, QSO A has been resolved into its host galaxy and a close companion. The non-detection with HST of a secondary lensed image of the background QSO in the close vicinity of the foreground one and the modeling of the host of QSO A, of the companion and of field galaxies with Singular Isothermal Spheres (SIS) yield a robust upper limit on the central compact mass of 4.5 10[SUP]11[/SUP] M[SUB]sun[/SUB]. On the other hand, the combined mass of Q1148+0055 B plus host must be smaller than 6.5 10[SUP]11[/SUP] M[SUB]sun[/SUB] since no secondary lensed image has been detected with HST. Photometry and relative astrometry of all the detected objects are reported. Based on data collected with the Hubble Space Telescope and at the European Southern Observatory, La Silla, Chile
http://hdl.handle.net/2268/16694
http://esoads.eso.org/abs/2000A%26A...356..840C
The authors thank EDP Sciences for their deposit authorization

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