Low Temperature Physics: 24, 139 (1998); https://doi.org/10.1063/1.593561 (1 pages)
Физика Низких Температур: Том 24, Выпуск 2 (Февраль 1998), c. 186-186    ( к оглавлению , назад )

Large microlensing history and perspectives

A. V. Byalko

L. D. Landau Institute for Theoretical Physics, 117940, Kosygin St., 2, Moscow, Russia
E-mail: byalko@landau.ac.ru

Аннотация

The resent observational confirmation [1,2] of microlensing (i.e. gravitational focusing of light from a distant star by a small invisible body) becomes a scientific event of rather unusual appearance: this phenomena was theoretically predicted by Einstein 60 years ago [3], its observational probabilities were analyzed by me [4] and later by Paczynski [5]. Being finally observed the phenomena reveals difficulties to become a valuable observational instrument [6]. Actually the instrumental capacity of microlensing and the information about lens bodies occur to be limited: observations of a single event cannot say definitely what are the mass and transverse velocity of the lensing body, and how far it is located - only the product of the mass and distance becomes an actual outcome of each microlensing observation. I will report the results of a statistical approach to brightness changes of distant objects resulting in multiple microlensing. The theoretical time-correlation function will be compared with that for quasars observations [7]. Finally another observational procedure will be briefly discussed: the brightness curve of a pulsar in the radio waverange can reveal a diffraction pattern which could give information on both mass and distance to the lensing object.

PACS:
98.80.-k - Cosmology (see also section 04 General relativity and gravitation; for origin and evolution of galaxies, see 98.62.Ai; for elementary particle and nuclear processes, see 95.30.Cq; for dark matter, see 95.35.+d; for dark energy, see 95.36.+x; for superclus