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Is the Large Magellanic Cloud Microlensing Due to an Intervening Dwarf Galaxy?
- Source :
- Scopus-Elsevier
- Publication Year :
- 1997
- Publisher :
- American Astronomical Society, 1997.
-
Abstract
- 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 follow the expected halo density profile. Cepheid and red giant branch clump stars in the MACHO database are consistent with membership in the LMC. There is also no evidence in the literature for a distinct kinematic population, for intervening gas, or for the turn-off of such a hypothetical galaxy. We conclude that if the lenses are in a foreground galaxy, it must be a particularly dark galaxy.
- Subjects :
- Physics
education.field_of_study
010308 nuclear & particles physics
Cepheid variable
Population
Astrophysics::Instrumentation and Methods for Astrophysics
Astronomy and Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
RR Lyrae variable
Gravitational microlensing
01 natural sciences
Galaxy
Red-giant branch
Space and Planetary Science
0103 physical sciences
Astrophysics::Solar and Stellar Astrophysics
Astrophysics::Earth and Planetary Astrophysics
education
Large Magellanic Cloud
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
Dwarf galaxy
Subjects
Details
- ISSN :
- 0004637X
- Volume :
- 490
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal
- Accession number :
- edsair.doi.dedup.....e8749cebc09e68f8f0e7862da6d8efb7
- Full Text :
- https://doi.org/10.1086/311016