RR lyrae in front of the LMC; implications for microlensing
Conference
·
OSTI ID:293412
- and others
The recent suggestion that the microlensing events observed towards the Large Magellanic Cloud are due to an intervening Sgr-like dwarf galaxy is examined. A search for foreground RR Lyrae in the MACHO photometry database yields 20 stars whose distance distribution is not concentrated, and follows the expected halo density profile. Cepheid and red giant branch clump stars in the MACHO database are consistent with membership in the LMC. Since (equal to or less than) 0.3 percent of the RR Lyrae and Cepheids are in the foreground, we conclude that the observed microlensing optical depth is not due to an intervening dwarf galaxy.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE Office of Financial Management and Controller, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 293412
- Report Number(s):
- UCRL-JC--128953; CONF-9708178--; ON: DE98057432; BR: YN0100000
- Country of Publication:
- United States
- Language:
- English
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