Recent developments in gravitational microlensing and the latest MACHO results: Microlensing towards the galactic bulge

Journal Article · Sat Jul 01 00:00:00 EDT 1995 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.48390· OSTI ID:253187

Bennett, D P ^[1]; Alcock, C ^[2]; Allsman, R A; Axelrod, T S ^[2]; Cook, K H ^[2]; Freeman, K C ^[3]; Griest, K ^[1]; Marshall, S L ^[1]; Perlmutter, S ^[1]; Peterson, B A ^[3]; Pratt, M R ^[1]; Quinn, P J; Rodgers, A W ^[3]; Stubbs, C W

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1. Center for Particle Astrophysics, University of California, Berkeley, California 94720 (United States)
2. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
3. Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston, ACT 2611 (Australia)

We review recent gravitational microlensing results from the EROS, MACHO, and OGLE collaborations, and present some details of the very latest MACHO results toward the Galactic Bulge, The MACHO collaboration has now discovered in excess of 40 microlensing events toward the Galactic Bulge during the 1993 observing season. A preliminary analysis of this data suggests a much higher microlensing optical depth than predicted by standard galactic models suggesting that these models will have to be revised. This may have important implications for the structure of the Galaxy and its dark halo. Also shown are MACHO data of the first microlensing event ever detected substantially before peak amplification, the first detection of parallax effects in a microlensing event, and the first caustic crossing to be resolved in a microlensing event. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• Sponsoring Organization: USDOE
• OSTI ID: 253187
• Report Number(s): CONF-9410287-; ISSN 0094-243X; TRN: 96:015091
• Journal Information: AIP Conference Proceedings, Vol. 336, Issue 1; Conference: 5. astrophysics conference: dark matter, College Park, MD (United States), 10-12 Oct 1994; Other Information: PBD: 1 Jul 1995
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
GRAVITATIONAL LENSES
REVIEWS
DATA ANALYSIS
MAGELLANIC CLOUDS
MASS DISTRIBUTION
MILKY WAY
OPTICAL DEPTH CURVE