Results 11 to 20 of about 2,208 (72)

Astrometric Microlensing with the GAIA satellite [PDF]

, 2001
GAIA is the ``super-Hipparcos'' survey satellite selected as a Cornerstone 6 mission by the European Space Agency. GAIA can measure microlensing by the small excursions of the light centroid that occur during events.
Alcock, Aubourg, Aurière, Bahcall, Binney, Binney, Boden, Boutreux, Burgasser, Chen, Cox, D'Antona, Dominik, Edvardsson, ESA, ESA, Evans, Evans, Evans, Gizis, Gould, Gould, Gould, Gould, Griest, Holmberg, Häfner, Høg, Kent, Kerins, Kiraga, Knox, Kroupa, McGinn, Mihalas, Miralda-Escudé, N. W. Evans, Oppenheimer, Paczyn´ski, Perryman, Press, Reid, Sahu, Sandage, Sazhin, Sazhin, Strauss, Udalski, V. A. Belokurov, van der Kamp, Walker, Wielen, Zhao   +52 more
core   +2 more sources

The effect of a binary source companion on the astrometric microlensing behaviour [PDF]

Monthly Notices of the Royal Astronomical Society, 2001
If gravitational microlensing occurs in a binary-source system, both source components are magnified, and the resulting light curve deviates from the standard one of a single source event. However, in most cases only one source component is highly magnified and the other component (the companion) can be treated as a simple blending source: blending ...
openaire   +2 more sources

Master Robotic Net

Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010
The main goal of the MASTER‐Net project is to produce a unique fast sky survey with all sky observed over a single night down to a limiting magnitude of 19‐20. Such a survey will make it possible to address a number of fundamental problems: search for dark energy via the discovery and photometry of supernovae (including SNIa), search for exoplanets ...
Vladimir Lipunov, Victor Kornilov, Evgeny Gorbovskoy, Nikolaj Shatskij, Dmitry Kuvshinov, Nataly Tyurina, Alexander Belinski, Alexander Krylov, Pavel Balanutsa, Vadim Chazov, Artem Kuznetsov, Petr Kortunov, Anatoly Sankovich, Andrey Tlatov, A. Parkhomenko, Vadim Krushinsky, Ivan Zalozhnyh, A. Popov, Taisia Kopytova, Kirill Ivanov, Sergey Yazev, Vladimir Yurkov, Taro Kotani   +22 more
wiley   +1 more source

Automated Detection of Short Optical Transients of Astrophysical Origin in Real Time

Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010
The detection of short optical transients of astrophysical origin in real time is an important task for existing robotic telescopes. The faster a new optical transient is detected, the earlier follow‐up observations can be started. The sooner the object is identified, the more data can be collected before the source fades away, particularly in the most
Marcin Sokołowski, Katarzyna Małek, Lech W. Piotrowski, Grzegorz Wrochna, Taro Kotani   +4 more
wiley   +1 more source

Gravitational Lensing as a Probe of Cold Dark Matter Subhalos

Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010
In the cold dark matter scenario, dark matter halos are assembled hierarchically from smaller subunits. Some of these subunits are disrupted during the merging process, whereas others survive temporarily in the form of subhalos. A long‐standing problem with this picture is that the number of subhalos predicted by simulations exceeds the number of ...
Erik Zackrisson, Teresa Riehm, Regina Schulte-Ladbeck   +2 more
wiley   +1 more source

Blending in Future Space-based Microlensing Surveys [PDF]

, 2006
We investigate the effect of blending in future gravitational microlensing surveys by carrying out simulation of Galactic bulge microlensing events to be detected from a proposed space-based lensing survey.
Bennett D. P., Byeong‐Gon Park, Cheongho Han, Han C., Ho‐Il Kim, Kyongae Chang, Udalski A.   +6 more
core   +2 more sources

Expectations on the mass determination using astrometric microlensing by Gaia

, 2020
Context. Astrometric gravitational microlensing can be used to determine the mass of a single star (the lens) with an accuracy of a few percent. To do so, precise measurements of the angular separations between lens and background star with an accuracy ...
Bastian, U., Klüter, J., Wambsganss, J.
core   +1 more source

Improved Detection Rates for Close Binaries Via Astrometric Observations of Gravitational Microlensing Events [PDF]

, 1999
In addition to constructing a Galactic matter mass function free from the bias induced by the hydrogen-burning limit, gravitational microlensing allows one to construct a mass function which is less affected by the problem of unresolved binaries (Gaudi &
Alard C., Ansari R., Ansari R., Cheongho Han, Dominik M., Duquennoy A., Kroupa P., Kyongae Chang, Paczynski B., Schneider P., Udalski A., Witt H., Zhao H.   +12 more
core   +3 more sources

Optical Gravitational Lensing Experiment. OGLE-1999-BUL-32: the Longest Ever Microlensing Event -- Evidence for a Stellar Mass Black Hole? [PDF]

, 2001
We describe the discovery of the longest microlensing event ever observed, OGLE-1999-BUL-32, also independently identified by the MACHO collaboration as MACHO-99-BLG-22. This unique event has an Einstein radius crossing time of 641 days. The high quality
Kubiak, M., Mao, Shude, Pietrzyński, G., Smith, Martin C., Soszyński, I., Szymánski, M., Udalski, A., Woźniak, P., Zebruń, K.   +8 more
core   +4 more sources

A Natural Formalism for Microlensing [PDF]

, 2000
If the standard microlensing geometry is inverted so that the Einstein ring is projected onto the observer plane rather than the source plane, then the relations between the observables (\theta_E,\tilde r_E) and the underlying physical quantities (M ...
Andrew Gould, Bennett D. B., Mao S., Refsdal S., Refsdal S.   +4 more
core   +3 more sources