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A radio-microlensing caustic crossing in B1600+434?
- First, we review the current status of the detection of strong `external' variability in the CLASS gravitational B1600+434, focusing on the 1998 VLA 8.5-GHz and 1998/9 WSRT multi-frequency observations. We show that this data can best be explained in terms of radio-microlensing. We then proceed to show some preliminary results from our new multi-frequency VLA monitoring program, in particular the detection of a strong feature (~30%) in the light curve of the lensed image which passes predominantly through the dark-matter halo of the lens galaxy. We tentatively interpret this event, which lasted for several weeks, as a radio-microlensing caustic crossing, i.e. the superluminal motion of a micro-arcsec-scale jet-component in the lensed source over a single caustic in the magnification pattern, that has been created by massive compact objects along the line-of-sight to the lensed image.
Verfasserangaben: | L. V. E. Koopmans, A. G. Bruyn, Joachim Wambsganß, C. D. Fassnacht |
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URL: | http://xxx.uni-augsburg.de/pdf/astro-ph/0004285 |
ISBN: | 1-538-81076-5 |
Publikationstyp: | Wissenschaftlicher Artikel |
Sprache: | Englisch |
Jahr der Erstveröffentlichung: | 2001 |
Erscheinungsjahr: | 2001 |
Datum der Freischaltung: | 24.03.2017 |
Quelle: | Microlensing 2000 : a new era of microlensing astrophysics : Proceedings of a meeting held cap town / Hrsg.: John W. Menzies ; P. D. Sackett. - San Francisco : Astronomical Sociey of the Pacific, 2001. - (Astronomical Society of the Pacific conference series ; 239). - ISBN 1-538-81076-5. - S. 8 |
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
Name der Einrichtung zum Zeitpunkt der Publikation: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik |