Prediction and analysis of basic gravitational microlensing phenomena

Details Prediction and analysis of basic gravitational microlensing phenomena Prediction and analysis of basic gravitational microlensing phenomena

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phdt........12n&link_type=abstract

Ph.D. Thesis Pennsylvania Univ., Philadelphia.

Astronomy and Astrophysics

Astronomy

4

Active Galactic Nuclei, Astronomical Models, Formalism, Galactic Structure, Gravitational Lenses, Quasars, Emission Spectra, Light Curve, Stellar Gravitation

Scientific paper

The phenomena of gravitational microlensing are described, and predictions are made about its possible future detection. A mathematical formalism is developed which exploits gravitational lensing effects in terms of photometric measuring capability. The formalism is then used to outline the most probable places to look for microlensing. Basic microlensing induced light curves are calculated for a variety of possible lens-source configurations. These configurations include that of a single star acting as a lens, and that of a double star acting as the lens. The light curve signatures of the double star are themselves indicators of the microlensing phenomenon. Light curve signatures for a single star acting on a uniform extended source are presented. Analysis is described listing methods by which parameters taken from this light curve could be used to recover both lens and source information. The effect of microlensing on the shape of the spectral lines originating in the broad line emission region (BLR) of an active galactic nucleus (AGN) is analyzed. A sample finding list of Quasi-Stellar Objects (QSOs) is presented for observers. For the assumption of galaxies made up entirely of compact objects, calculations are presented for each QSO on the list, listing optical depth for microlensing, the average time between microlensing events of various amplitudes, and the expected duration of an event. Possible observing programs are described.

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