Macro- and micromodels for gravitational lenses

Details Macro- and micromodels for gravitational lenses Macro- and micromodels for gravitational lenses

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...357..309k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 357, July 10, 1990, p. 309-320.

Statistics

Computation

16

Astronomical Models, Cosmology, Gravitational Lenses, Hubble Constant, Light Curve, Quasars, Computational Astrophysics, Energy Sources, Radio Galaxies, Relativistic Theory

Scientific paper

General aspects of the modeling of gravitationally lensed objects are discussed. A new superposition principle for deflector models is introduced, and the consequences of the nonuniqueness of lens models are discussed. Special emphasis is placed on the time delay and on the determination of the Hubble parameter and the lens mass. Contrary to common belief, the determination of the lens mass is not independent of the shear due to the distribution of the matter around the lens. In general, the use of macrolensing as a 'cosmological tool' is limited by ignorance of the distribution of (especially dark) matter. If time delay ratios can be measured, the parameter space of the lens model can be significantly reduced, thereby allowing more acurate estimates of the lens mass. Possible parameters for describing microlensing light curves are discussed and analyzed with respect to their usefulness for obtaining information on the macromodel and on the distribution of compact objects in the lens. New lens models are presented for the classical double quasar 0957 + 561A, B, from which a lens mass of 6 x 10 to the 11th solar masses is derived.

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