Results 1 to 10 of about 2,208 (72)
Finite-source and finite-lens effects in astrometric microlensing [PDF]
Monthly Notices of the Royal Astronomical Society, 2010 The aim of this paper is to study the astrometric trajectory of microlensing events with an extended lens and/or source. We consider not only a dark lens but also a luminous lens as well. We find that the discontinuous finite-lens trajectories given by Takahashi (2003) will become continuous in the finite-source regime.
Chien-Hsiu Lee
exaly +7 more sources
Orbital motion effects in astrometric microlensing [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 We investigate lens orbital motion in astrometric microlensing and its detectability. In microlensing events, the light centroid shift in the source trajectory (the astrometric trajectory) falls off much more slowly than the light amplification as the source distance from the lens position increases.
Sedighe Sajadian
exaly +3 more sources
Discerning Parallax Amplitude in Astrometric Microlensing
Astronomical Journal, 2023 Gravitational microlensing is a powerful method for discovering isolated stellar-mass black holes (ISMBHs). These objects make long-duration microlensing events.
Sedighe Sajadian
exaly +2 more sources
The Effect of Bright Lenses on the Astrometric Observations of Gravitational Microlensing Events [PDF]
Astrophysical Journal, 1999 In current microlensing experiments, information about the physical parameters of individual lenses is obtained from the Einstein timescales. However, the nature of MACHOs is still very uncertain, despite the large number of detected events. This uncertainty is mainly due to the degeneracy of the lens parameters in the measured Einstein timescales. The
Cheongho Han
exaly +2 more sources
PARALLAX AND ORBITAL EFFECTS IN ASTROMETRIC MICROLENSING WITH BINARY SOURCES [PDF]
Astrophysical Journal, 2016 ABSTRACT In gravitational microlensing, binary systems may act as lenses or sources. Identifying lens binarity is generally easy, in particular in events characterized by caustic crossing since the resulting light curve exhibits strong deviations from a smooth single-lensing light curve.
Achille A Nucita +2 more
exaly +4 more sources
Effect of a Wide Binary Companion to the Lens on the Astrometric Behavior of Gravitational Microlensing Events [PDF]
Astrophysical Journal, 2002 In this paper, we investigate the effect of a wide binary companion of the lens on the astrometric behavior of Galactic gravitational microlensing events and compare it to the effect on the photometric behavior. We find that the wide binary companion of the lens can affect the centroid motion of images substantially even if the corresponding light ...
Cheongho Han
exaly +3 more sources
ASTROMETRIC IMAGE CENTROID DISPLACEMENTS DUE TO GRAVITATIONAL MICROLENSING BY THE ELLIS WORMHOLE
Astrophysical Journal, 2011 Continuing work initiated in an earlier publication (Abe, ApJ, 725 (2010) 787), we study the gravitational microlensing effects of the Ellis wormhole in the weak-field limit.
Hideki Asada
exaly +3 more sources
Extended source effects in astrometric gravitational microlensing [PDF]
Monthly Notices of the Royal Astronomical Society, 1998 Extended source size effects have been detected in photometric monitoring of gravitational microlensing events. We study similar effects in the centroid motion of an extended source lensed by a point mass. We show that the centroid motion of a source with uniform surface brightness can be obtained analytically.
Mao, Shude, Witt, Hans J.
openaire +3 more sources
A Reanalysis of the Isolated Black Hole Candidate OGLE-2011-BLG-0462/MOA-2011-BLG-191
The Astrophysical Journal, 2023 There are expected to be ∼10 ^8 isolated black holes (BHs) in the Milky Way. OGLE-2011-BLG-0462/MOA-2011-BLG-191 (OB110462) is the only such BH with a mass measurement to date. However, its mass is disputed: Lam et al.
Casey Y. Lam, Jessica R. Lu
doaj +1 more source
Ongoing astrometric microlensing events from VVV and Gaia [PDF]
, 2019 6 pages, 2 figures, accepted MNRAS LettersWe extend predictive microlensing event searches using the Vista Variables in the Via Lactea survey and the second Gaia data release.
Belokurov, Vasily +4 more
core +3 more sources