Article (Scientific journals)
Accurate photometric light curves of the lensed components of Q2237+0305 derived with an optimal image subtraction technique: Evidence for microlensing in image A
Moreau, O.; Libbrecht, C.; Lee, D. W. et al.
2005In Astronomy and Astrophysics, 436 (2), p. 479-492
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Keywords :
gravitational lensing; quasars : individual : Q2237+0305; techniques : photometric; techniques : image processing
Abstract :
[en] Using an optimal image subtraction technique, we have derived the V and R light curves of the four lensed QSO components of Q2237+0305 from the monitoring CCD frames obtained by the GLITP collaboration with the 2.6m NOT telescope in 1999/2000 (Alcalde et al. 2002). We give here a detailed account of the data reduction and analysis and of the error estimates. In agreement with Wozniak et al. (2000a,b), the good derived photometric accuracy of the GLITP data allows to discuss the possible interpretation of the light curve of component A as due to a microlensing event taking place in the deflecting galaxy. This interpretation is strengthened by the colour dependence of the early rise of the light curve of component A, as it probably corresponds to a caustics crossing by the QSO source.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Moreau, O.
Libbrecht, C.
Lee, D. W.
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Language :
English
Title :
Accurate photometric light curves of the lensed components of Q2237+0305 derived with an optimal image subtraction technique: Evidence for microlensing in image A
Publication date :
June 2005
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
436
Issue :
2
Pages :
479-492
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 22 July 2009

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