Microlensing of compact extragalactic H II regions by Milky Way black holes could produce detectable line excesses, but the expected event rate is only about 10^-6 per year.
Introduction to Gravitational Microlensing
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abstract
The basic concepts of gravitational microlensing are introduced. We start with the lens equation, and then derive the image positions and magnifications. The statistical quantities of optical depth and event rate are then described. We finish with a summary and a list of challenges and open questions. A problem set is given for students to practice.
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astro-ph.GA 1years
2026 1verdicts
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Spectral Microlensing of Extragalactic H II Regions by Stellar-Mass Black Holes
Microlensing of compact extragalactic H II regions by Milky Way black holes could produce detectable line excesses, but the expected event rate is only about 10^-6 per year.