Is the LMC Microlensing Due to an Intervening Dwarf Galaxy?
arXiv:astro-ph/9707310 · doi:10.1086/311016
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.
arXiv comment11 pages, 4 PostScript figures, uses aaspp4.sty. Submitted to The Astrophysical Journal Letters
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Cited by in corpus (27)
- Dwarf Galaxies of the Local Group
- The Use of High Magnification Microlensing Events in Discovering Extra-solar Planets
- Binary Microlensing Events from the MACHO Project
- The Rotation Curve of the Large Magellanic Cloud and the Implications for Microlensing
- The MACHO Project 9 Million Star Color-Magnitude Diagram of the Large Magellanic Cloud
- A tidal extension in the Ursa Minor dwarf spheroidal galaxy
- Self-Lensing Models of the LMC
- Kinematic Evidence for an Old Stellar Halo in the Large Magellanic Cloud
- Is Galactic Dark Matter White ?
- Observational discovery of the AGB-bump in densely populated color-magnitude diagrams of galaxies and star clusters
- The LMC Microlensing Events: Evidence for a Warped and Flaring Milky Way Disk?
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- Red Clump Morphology as Evidence Against a New Intervening Stellar Population as the Primary Source of Microlensing Toward the LMC
- Identification of 13 Cepheids and 333 Other Variables in M31
- Microlens Parallaxes with SIRTF
- A first-overtone RR Lyrae star with cyclic period changes
- Constraints on Intervening Stellar Populations Toward the Large Magellanic Cloud
- Microlens Parallax Asymmetries Toward the LMC
- Searching for Machos (and other Dark Matter Candidates) in a Simulated Galaxy
- Re-examination of the possible tidal stream in front of the LMC
- Magellanic Cloud Gravitational Microlensing Results: What Do They Mean?
- Red Clump Stars as a Tracer of Microlensing Optical Depth
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- A New Argument Against An Intervening Stellar Population Toward the LMC
- Reanalysis of c-type RR Lyrae Variable BE Dor, Period Modulations and Possible Mechanism
- Omega_B and Omega_0 From MACHOs and Local Group Dynamics