Gravitational microlensing searches and results
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.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 302094
- Report Number(s):
- UCRL-JC-127471; CONF-961254-; ON: DE98050935
- Resource Relation:
- Conference: 18. Texas symposium on relativistic astrophysics, Chicago, IL (United States), 15-20 Dec 1996; Other Information: PBD: 8 May 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Search for MACHOs in the galactic dark matter
MICROLENSING-BASED ESTIMATE OF THE MASS FRACTION IN COMPACT OBJECTS IN LENS GALAXIES