Results 21 to 30 of about 63,611 (230)

THE ANALYSIS OF IMAGES OF A CIRCULAR SOURCE IN N-POINT GRAVITATIONAL LENSES

Odessa Astronomical Publications, 2018
Currently, in the field of computer processing, there are difficulties. When processing astrophysical experimental data, the difficulties are connected, on the one hand, with a large amount of information that requires processing, and, on the other hand,
S. D. Bronza, Ju. V. Svyrydova, L. A. Kotvytska   +2 more
doaj   +1 more source

The inner mass power spectrum of galaxies using strong gravitational lensing: beyond linear approximation [PDF]

, 2017
In the last decade the detection of individual massive dark matter sub-halos has been possible using potential correction formalism in strong gravitational lens imaging.
Chatterjee, Saikat, Koopmans, Léon V. E.   +1 more
core   +3 more sources

MOA-2020-BLG-208Lb: Cool Sub-Saturn-mass Planet within Predicted Desert

The Astronomical Journal, 2023
We analyze the MOA-2020-BLG-208 gravitational microlensing event and present the discovery and characterization of a new planet, MOA-2020-BLG-208Lb, with an estimated sub-Saturn mass.
Greg Olmschenk, David P. Bennett, Ian A. Bond, Weicheng Zang, Youn Kil Jung, Jennifer C. Yee, Etienne Bachelet, Leading authors, Fumio Abe, Richard K. Barry, Aparna Bhattacharya, Hirosane Fujii, Akihiko Fukui, Yuki Hirao, Stela Ishitani Silva, Yoshitaka Itow, Rintaro Kirikawa, Iona Kondo, Naoki Koshimoto, Yutaka Matsubara, Sho Matsumoto, Shota Miyazaki, Brandon Munford, Yasushi Muraki, Arisa Okamura, Clément Ranc, Nicholas J. Rattenbury, Yuki Satoh, Takahiro Sumi, Daisuke Suzuki, Taiga Toda, Paul J. Tristram, Aikaterini Vandorou, Hibiki Yama, The MOA Collaboration, Michael D. Albrow, Sang-Mok Cha, Sun-Ju Chung, Andrew Gould, Cheongho Han, Kyu-Ha Hwang, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, The KMTNet Collaboration, Grant Christie, Tony Cooper, John Drummond, Jonathan Green, Steve Hennerley, Jennie McCormick, L. A. G. Monard, Tim Natusch, Ian Porritt, Thiam-Guan Tan, The MicroFUN Collaboration, Shude Mao, Dan Maoz, Matthew T. Penny, Wei Zhu, The MAP Follow-Up Collaboration, V. Bozza, Arnaud Cassan, Martin Dominik, Markus Hundertmark, R. Figuera Jaimes, K. Kruszyńska, K. A. Rybicki, R. A. Street, Y. Tsapras, Joachim Wambsganss, Ł. Wyrzykowski, P. Zieliński, The OMEGA Collaboration, Gioia Rau   +82 more
doaj   +1 more source

Scattering of Gravitational Waves by the Weak Gravitational Fields of Lens Objects

, 2005
We consider the scattering of the gravitational waves by the weak gravitational fields of lens objects. We obtain the scattered gravitational waveform by treating the gravitational potential of the lens to first order, i.e.
Bartelmann, Bontz, Deguchi, Kaiser, Macquart, Nakamura, Ohanian, Peters, R. Takahashi, Ruffa, S. Michikoshi, T. Suyama, Takahashi, Tatarskii   +13 more
core   +1 more source

Quantum Uncertainty Considerations for Gravitational Lens Interferometry

, 2008
The measurement of the gravitational lens delay time between light paths has relied, to date, on the source having sufficient variability to allow photometric variations from each path to be compared. However, the delay times of many gravitational lenses
Carico, David P., Doyle, Laurance R.
core   +1 more source

Defocusing gravitational microlensing [PDF]

, 1996
We introduce the notion of defocusing gravitational lens considering a MACHO located behind a light source with respect to an observer. The consequence of defocusing effect is a temporal variability of star luminosity which produces a gap instead of a ...
A A Marino, Alard C, Binney J, Blioh P V, Byrd P F, Carr B J, G Marmo, Harwit M, Hawking S W, Kaiser R, Paczynski B, Padmanabhan T, Papapetrou A, Peebles P J E, R de Ritis, Refsdal S, S Capozziello, Schneider P, Schneider P, Schneider P, Udalski A, V I Man'ko, Wald R M   +22 more
core   +3 more sources

The Gravitational Lens CFRS03.1077 [PDF]

, 2002
An exquisite gravitational arc with a radius of 2.1" has been discovered around the z = 0.938 field elliptical galaxy CFRS03.1077 during HST observations of Canada-France Redshift Survey (CFRS) fields.
A. Matzkin, Crampton D., David Crampton, David Schade, F. Hammer, Jorgensen I., Miralda-Escude J., O. Le Fevre, S. J. Lilly, Warren S. J.   +9 more
core   +4 more sources

The Effects of Finite Distance on the Gravitational Deflection Angle of Light

Universe, 2019
In order to clarify the effects of the finite distance from a lens object to a light source and a receiver, the gravitational deflection of light has been recently reexamined by using the Gauss−Bonnet (GB) theorem in differential geometry (Ishihara
Toshiaki Ono, Hideki Asada
doaj   +1 more source

The Effects of Massive Substructures on Image Multiplicities in Gravitati onal Lenses

, 2003
Surveys for gravitational lens systems have typically found a significantly larger fraction of lenses with four (or more) images than are predicted by standard ellipsoidal lens models (50% versus 25-30%).
C. S. Kochanek, J. D. Cohn, Jaffe W., King L. J., Kochanek C. S., Patnaik A. R., Seitz S.   +6 more
core   +3 more sources

Testing Convolutional Neural Networks for finding strong gravitational lenses in KiDS [PDF]

, 2018
Convolutional Neural Networks (ConvNets) are one of the most promising methods for identifying strong gravitational lens candidates in survey data. We present two ConvNet lens-finders which we have trained with a dataset composed of real galaxies from ...
Chatterjee, S., Covone, G., Hopkins, A. M., Kelvin, L. S., Kleijn, G. Verdoes, Koopmans, L. V. E., Napolitano, N. R., Petrillo, C. E., Tortora, C., Vernardos, G.   +9 more
core   +3 more sources