Article (Scientific journals)
New observations and gravitational lens models of the Cloverleaf quasar H1413 + 117
Kayser, R.; Surdej, Jean; Condon, J. J. et al.
1990In Astrophysical Journal, 364, p. 15-22
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The authors thank SAO/NASA ADS Astronomy Abstract Service and American Astronomical Society for their deposit authorization. The original publication can be found in the Astrophysical Journal.


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Keywords :
GRAVITATIONAL LENSES; QUASARS; RADIO ASTRONOMY; ELLIPTICAL GALAXIES; IMAGE PROCESSING; RADIO SOURCES (ASTRONOMY); VERY LARGE ARRAY (VLA); ASTRONOMICAL MODELS
Abstract :
[en] New optical and radio observations of the quadruple quasar H1413 + 117, the Cloverleaf, are presented. VLA data show radio counterparts at the positions of the four optical images and an additional strong radio source between images B and D. Gravitational lens models of H1413 + 117 using (1) a single elliptical galaxy and (2) two spherical galaxies are presented, which fit the positions of the four images of the quasar remarkably well. The models suggest that the strong radio source is a feature of the quasar, e.g., an ejected blob, which lies right on the caustic of the lens and is thereby strongly amplified. The time delays predicted by these models are sufficiently short to allow for their determination within one observational season, making H1413 + 117 an exceptionally well suited object for gravitational lens research.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Kayser, R.;  Toronto, University, Canada
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Condon, J. J.;  Liege, Universite, Cointe-Ougree, Belgium
Kellermann, K. I.;  National Radio Astronomy Observatory, Charlottesville, VA
Magain, Pierre  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Remy, M.
Smette, A.
Language :
English
Title :
New observations and gravitational lens models of the Cloverleaf quasar H1413 + 117
Publication date :
20 November 1990
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
University of Chicago Press, Chicago, United States - Illinois
Volume :
364
Pages :
15-22
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 November 2009

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