Results 31 to 40 of about 3,383 (120)

Possible Gravitational Microlensing Events in the Optical Lightcurve of Active Galaxy S5 0716+714

The Astrophysical Journal, 2023
A well-known active galaxy of the blazar type, S5 0716+714, is characterized by a particularly high-variability duty cycle on short timescales at optical frequencies.
D. Ł. Król, Ł. Stawarz, J. Krzesinski, C. C. Cheung   +3 more
doaj   +1 more source

Detectability of Orbital Motion in Stellar Binary and Planetary Microlenses [PDF]

, 2010
A standard binary microlensing event lightcurve allows just two parameters of the lensing system to be measured: the mass ratio of the companion to its host, and the projected separation of the components in units of the Einstein radius.
Albrow, Alcock, Alcock, Alcock, An, An, Beaulieu, Bennett, Bennett, Bennett, Binney, Bond, Cassan, Dominik, Dominik, Dong, Dong, Duquennoy, Eamonn Kerins, Erdl, Fischer, Gaudi, Gaudi, Gould, Gould, Gould, Gould, Gould, Griest, Griest, Han, Han, Han, Han, Holtzman, Hwang, Ioka, James, Janczak, Jaroszynski, Jaroszynski, Jaroszynski, Jaroszynski, Kim, Kubas, Lada, Mao, Mao, Matthew T. Penny, Nemiroff, Newcombe, Newcombe, Paczyński, Park, Rahvar, Rattenbury, Refsdal, Ryu, Sako, Schechter, Shude Mao, Skowron, Smith, Smith, Sumi, Sumi, Sumi, Udalski, Udalski, Udalski, Wilson, Witt, Witt   +72 more
core   +3 more sources

Orbital motion effects in astrometric microlensing [PDF]

, 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 ...
Sajadian, Sedighe
core   +1 more source

Dark Matter Halos from the Inside Out

Advances in Astronomy, Volume 2011, Issue 1, 2011., 2011
The balance of evidence indicates that individual galaxies and groups or clusters of galaxies are embedded in enormous distributions of cold, weakly interacting dark matter. These dark matter “halos” provide the scaffolding for all luminous structures in the universe, and their properties comprise an essential part of the current cosmological model.
James E. Taylor, Rob Ivison
wiley   +1 more source

OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected From Spitzer Only [PDF]

, 2018
We analyze the binary gravitational microlensing event OGLE-2017-BLG-1130 (mass ratio q~0.45), the first published case in which the binary anomaly was only detected by the Spitzer Space Telescope.
Albrow, M., Beichman, C., Bryden, G., Calchi Novati, S., Carey, S., Cha, S., Chung, S., Collaboration, K., Collaboration, O., Gaudi, B., Gould, A., Han, C., Henderson, C., Hwang, K., Jung, Y., Kim, D., Kim, H., Kim, S., Kozłowski, S., Lee, C., Lee, D., Lee, Y., Mao, S., Mróz, P., Park, B., Pawlak, M., Pietrukowicz, P., Pogge, R., Poleski, R., Ryu, Y., Shin, I., Shvartzvald, Y., Skowron, J., Soszyński, I., Szymański, M., Team, S., Udalski, A., Ulaczyk, K., Wang, T., Yee, J., Zang, W., Zhu, W.   +41 more
core   +2 more sources

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

Detectability of extrasolar moons as gravitational microlenses [PDF]

, 2010
We evaluate gravitational lensing as a technique for the detection of extrasolar moons. Since 2004 gravitational microlensing has been successfully applied as a detection method for extrasolar planets.
Liebig, Christine, Wambsganss, Joachim
core   +1 more source

Astrometric Method to Break the Photometric Degeneracy between Binary-source and Planetary Microlensing Perturbations [PDF]

, 2001
An extra-solar planet can be detected by microlensing because the planet can perturb the smooth lensing light curve created by the primary lens. However, it was shown by Gaudi that a subset of binary-source events can produce light curves that closely ...
Cheongho Han, Dominik M., Hog E., Lasserre T. M., Sazhin M. V.   +4 more
core   +3 more sources

OGLE-2013-BLG-0578L: Microlensing Binary Composed of A Brown Dwarf And An M Dwarf

, 2015
Determining physical parameters of binary microlenses is hampered by the lack of information about the angular Einstein radius due to the difficulty of resolving caustic crossings.
A. Udalski, C. Han, G. Pietrzyński, H. Park, I. Soszyński, J. Skowron, K. Ulaczyk, M. K. Szymański, null null, P. Pietrukowicz, R. Poleski, S. Kozłowski, Ł. Wyrzykowski   +12 more
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