Gravitational microlensing searches and results

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Baryonic matter, in the form of Machos (MAssive Compact Halo Objects), might be a significant constituent of the dark matter that dominates the Milky Way. This article describes how surveys for Machos exploit the gravitational microlens magnification of extragalactic stars. The experimental searches for this effect monitor millions of stars, in some cases every night, looking for magnification events. The early results of these surveys indicate that Machos make up a significant fraction of the dark matter in the Milky Way, and that these objects have stellar masses. Truly substellar objects do not contribute much to the total. Additionally, the ... continued below

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11 p.

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Alcock, C. May 8, 1997.

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Description

Baryonic matter, in the form of Machos (MAssive Compact Halo Objects), might be a significant constituent of the dark matter that dominates the Milky Way. This article describes how surveys for Machos exploit the gravitational microlens magnification of extragalactic stars. The experimental searches for this effect monitor millions of stars, in some cases every night, looking for magnification events. The early results of these surveys indicate that Machos make up a significant fraction of the dark matter in the Milky Way, and that these objects have stellar masses. Truly substellar objects do not contribute much to the total. Additionally, the relatively high event rate towards the Galactic bulge seems to require that the bulge be elongated, and massive.

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11 p.

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OSTI as DE98050935

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  • 18. Texas symposium on relativistic astrophysics, Chicago, IL (United States), 15-20 Dec 1996

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  • Other: DE98050935
  • Report No.: UCRL-JC--127471
  • Report No.: CONF-961254--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 302094
  • Archival Resource Key: ark:/67531/metadc684397

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Office of Scientific & Technical Information Technical Reports

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  • May 8, 1997

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  • July 25, 2015, 2:20 a.m.

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  • May 8, 2017, 12:44 p.m.

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Alcock, C. Gravitational microlensing searches and results, article, May 8, 1997; California. (digital.library.unt.edu/ark:/67531/metadc684397/: accessed May 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.