A microlensing model for QSO 2237 + 0305

Journal Article · Sun Apr 01 04:00:00 EDT 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168546· OSTI ID:6865547

Wambsganss, J; Paczynski, B; Katz, N ^[1]

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1. Princeton Univ. Observatory, NJ (USA) Max-Planck-Institut fuer Astrophysik, Garching (Germany, F.R.)

Models of microlensing are presented for the four images of QSO 2237 + 0305, with the surface mass density and shear for each image based on the macrolensing model developed by Schneider et al. (1988). The computations were done with a new code that makes use of the hierarchical tree method. The high efficiency of this approach makes it possible to include up to 60,000 lensing stars with different masses. Examples are given of amplification maps, light curves, correlation functions, and amplification probabilities. All these are very strongly affected by the shear due to macrolensing. The observed changes in the luminosity of the four images of QSO 2237 + 0305 are most likely induced by microlensing. 16 refs.

• OSTI ID: 6865547
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 352; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLIFICATION
CORRELATION FUNCTIONS
COSMIC RADIO SOURCES
FUNCTIONS
GRAVITATIONAL LENSES
IMAGES
LENSES
LUMINOSITY
MAPS
MASS
MATHEMATICAL MODELS
OPTICAL PROPERTIES
PHOTOGRAPHY
PHYSICAL PROPERTIES
QUASARS