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Titolo:
Resolving gravitational microlensing events with long-baseline optical interferometry - Prospects for the ESO Very Large Telescope Interferometer
Autore:
Delplancke, F; Gorski, KM; Richichi, A;
Indirizzi:
European So Observ, D-85748 Garching, Germany European So Observ Garching Germany D-85748 v, D-85748 Garching, Germany Univ Warsaw Observ, PL-00478 Warsaw, Poland Univ Warsaw Observ Warsaw Poland PL-00478 bserv, PL-00478 Warsaw, Poland
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 2, volume: 375, anno: 2001,
pagine: 701 - 710
SICI:
1432-0746(200108)375:2<701:RGMEWL>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
OBJECTS;
Keywords:
gravitation; instrumentation : interferometers; techniques : interferometric; gravitational lensing;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Delplancke, F European So Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany European So Observ Karl Schwarzschild Str 2 Garching Germany D-85748
Citazione:
F. Delplancke et al., "Resolving gravitational microlensing events with long-baseline optical interferometry - Prospects for the ESO Very Large Telescope Interferometer", ASTRON ASTR, 375(2), 2001, pp. 701-710

Abstract

Until now, the detailed interpretation of the observed microlensing eventshas suffered from the fact that the physical parameters of the phenomenon cannot be uniquely determined from the available astronomical measurements,i.e. the photometric lightcurves. The situation will change in the near-future with the availability of long-baseline, sensitive optical interferometers, which should be able to resolve the images of the lensed objects into their components. For this, it will be necessary to achieve a milliarcsecond resolution on sources with typical magnitudes K greater than or similar to 12. Indeed, brighter events have never been observed up to now by micro-lensing surveys. We discuss the possibilities opened by the use of long baseline interferometry in general, and in particular for one such facility, the ESO VLT Interferometer, which will attain the required performance. We discuss the expected accuracy and limiting magnitude of such measurements. Onthe basis of the database of the events detected by the OGLE experiment, we estimate the number of microlenses that could be available for measurements by the VLTI. We find that at least several tens of events could be observed each year. In conjunction with the photometric data, our ability to measure the angular separation between the microlensed images will enable a direct and unambiguous determination of both their masses and locations.

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Documento generato il 03/04/20 alle ore 07:18:33