[en] The Cloverleaf quasar, H1413+117, has been photometrically monitored at ESO (La Silla, Chile) and with the NOT (La Palma, Spain) during the period 1987--1994. All good quality CCD frames have been successfully analysed using two independent methods (i.e. an automatic image decomposition technique and an interactive CLEAN algorithm). The photometric results from the two methods are found to be very similar, and they show that the four lensed QSO images vary significantly in brightness (by up to 0.45 mag), nearly in parallel. The lightcurve of the $D$ component presents some slight departures from the general trend which are very likely caused by micro-lensing effects. Upper limits, at the 99% confidence level, of 150 days on the absolute value for the time delays between the photometric lightcurves of this quadruply imaged variable QSO, are derived. This is unfortunately too large to constrain the lens model but there is little doubt that a better sampling of the lightcurves should allow to accurately derive these time delays. Pending a direct detection of the lensing galaxy (position and redshift), this system thus constitutes another good candidate for a direct and independent determination of the Hubble parameter. Based on observations collected at the European Southern Observatory (La Silla, Chile) and with the Nordic Optical Telescope (La Palma, Spain). Table 1. Logbook for the ESO and NOT observations together with photometric results for the Cloverleaf quasar. This long table can be accessed on the WWW at the URL address: http://vela.astro.ulg.ac.be/grav_lens/glp_homepage.html}
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Ostensen, R.; Institute of Mathematical and Physical Sciences, University of Tromso, N-9037 Tromso, Norway
Remy, M.
Lindblad, P. O.; Stockholm Observatory, S-13336 Saltsjobaden, Sweden
Surdej, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Barthel, P. D.; Kapteyn Astronomical Institute, Rijksuniversiteit, Landleven 12, Postbus 800, 9700 AV Groningen, The Netherlands
Emanuelsen, P. I.; Institute of Mathematical and Physical Sciences, University of Tromso, N-9037 Tromso, Norway
Festin, L.; Astron. Obs. Box 515, S-751 20 Uppsala, Sweden
Gosset, Eric ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Hainaut, O.; Institute for Astronomy, 2680 Woodlawn Drive, Honolulu HI 96822, U.S.A.
Hakala, P.; Helsinki University Observatory, Tahtitorninmaki, SF-00014 Helsinki, Finland
Hjelm, M.; Stockholm Observatory, S-13336 Saltsjobaden, Sweden
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
Arnould P., Remy M., Gosset E., et al., 1993, Proc. 31st Liège Int. Astrophysical Coll. "Gravitational Lenses in the Universe", Surdej J. et al. (eds.), p. 169
Courbin F., Magain P., Remy M., et al., 1995, A&A 303, 1
Daulie G., Hainaut O., Hutsemékers D., et al., 1993, Proc. 31st Liège Int. Astrophysical Coll. "Gravitational Lenses in the Universe", Surdej J. et al. (eds.), p. 181
Drew J.E., Boksenberg A., 1984, MNRAS 211, 813
Hazard C., Morton D.C., Terlevich R., McMahon R., 1984, ApJ 282, 33
Hjorth J., Refsdal S., Stabell R., et al., 1996 (submitted to A&A)
Kayser R., Surdej J., Condon J.J., et al., 1990, ApJ 364, 15
Kayser R., 1993, Proc. 31st Liège Int. Astrophysical Coll. "Gravitational Lenses in the Universe", Surdej J. et al. (eds.), p. 5
Remy M., Gosset E., Hutsemékers D., et al., 1996, IAU Symp. 173, "Astrophysical applications of Gravitational Lensing", Kochanek C.S. & Hewitt J.N. (eds.), p. 261
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