Detecting compact dark matter in galaxy clusters via gravitational microlensing: A2218 and A370
Abstract
After decades of searching, the true nature of dark matter still eludes us. One potential probe of the form of dark matter in galaxy clusters is to search for microlensing variability in the giant arcs and arclets. In this paper, a simple method is introduced to characterize pixel variability in the limit of high optical depth to microlensing. Expanding on earlier work, the expected microlensing signal for two massive clusters, A2218 and A370 is calculated. It is found that the microlensing signal depends sensitively upon the mix of smooth and compact dark matter in the cluster. Comparison of two deep exposures taken with James Webb Space Telescope or 2-h exposures taken with a 30-m class telescope in two epochs separated by a few years will possibly detect a few dozen pixels that show strong variability due to microlensing at the 5σ level, revealing a wealth of information on the microlensing population.
Additional Information
© 2004 RAS. Accepted 2004 June 9. Received 2004 June 8; in original form 2004 March 11; Published: 21 September 2004. AVT is supported by IPRS and IPA from the University of Sydney and wishes to express his gratitude to Bernd Neindorf, Dmitry Klochkov and Mark Walker for useful discussions. GFL thanks OutKast for Hey Ya. JPK acknowledges support from Caltech and CNRS. Authors wish to thank Tim Bedding, Michael Scholz and Mike Ireland for useful explanations concerning the variability of Miras and the referee for important observations.Attached Files
Published - 353-3-853.pdf
Accepted Version - 0406282.pdf
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Additional details
- Eprint ID
- 108375
- Resolver ID
- CaltechAUTHORS:20210310-072343091
- University of Sydney
- Caltech
- Centre National de la Recherche Scientifique (CNRS)
- Created
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2021-03-10Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field