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Pixel Lensing: The Key to the Universe

Published online by Cambridge University Press:  25 May 2016

Andrew Gould
Andrew Gould*
Affiliation:
Dept of Astronomy, Ohio State University, Columbus, OH 43210 e-mail: [email protected]

Abstract

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Pixel lensing, the gravitational microlensing of unresolved stars, is potentially a powerful method for detecting and measuring microlensing events. Two groups are currently refining this method in observations toward M31. I show that the technique has wide application, from searching for intra-cluster Machos in the Virgo cluster, to improving the accuracy of follow-up observations of Galactic microlensing events, to measuring the star-formation history of the universe. I derive the equation for the pixel lensing event rate where Qmin is the minimum signal to noise for detection, τ is the optical depth, Nres is the number of telescope resolution elements in the field, is the photon detection rate from a fluctuation magnitude star, and ξ is a suppression factor.

Type
Chapter 10: Emerging Applications
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996 , pp. 365 - 370
Copyright
Copyright © Kluwer 1996 

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