Prospects for the Detection of Microlensing Time Delays

  • Christopher B. Moore
  • Jacqueline N. Hewitt
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 173)


Since the image separations produced by microlensing are inaccessible to observation, we are left to observe either a change in total amplitude or the time delay between the images. Spillar (1993) has suggested that a time delay might be observed in the autocorrelation of a microlensed signal. The time delays are of order a few microseconds and are easily accessible to a sufficiently wide bandwidth system. We calculate expected observational results using the Green Bank Telescope with a VLBA recording system, and find that brightness temperatures exceeding the Compton limit are required for detection.


Brightness Temperature Total Amplitude Gravitational Lens Lensing Event Image Separation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. Quirrenbach, A., Witzel, A., Krichbaum, T., Hummel, C., Wegner, R., Schalinski, C., Ott, M., Alberdi, A., & Rioja, M., 1992, A&A, 258, 279ADSGoogle Scholar
  2. Spillar, E., 1993, ApJ, 403, 20ADSCrossRefGoogle Scholar

Copyright information

© International Astronomical Union 1996

Authors and Affiliations

  • Christopher B. Moore
    • 1
  • Jacqueline N. Hewitt
    • 1
  1. 1.Massachusetts Institute of TechnologyCambridgeUSA

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