RR lyrae in front of the LMC; implications for microlensing

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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 ... continued below

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6 p.

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Minniti, D.; Aleves, D.A. & Alcock, C. April 1, 1997.

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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.

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6 p.

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OSTI as DE98057432

Other: FDE: PDF; PL:

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  • International Astronomical Union symposium 184: central regions of the galaxy and galaxies, Kyoto (Japan), 18-22 Aug 1997

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  • Other: DE98057432
  • Report No.: UCRL-JC--128953
  • Report No.: CONF-9708178--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 293412
  • Archival Resource Key: ark:/67531/metadc684393

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  • April 1, 1997

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  • July 25, 2015, 2:20 a.m.

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  • April 6, 2017, 5:55 p.m.

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Minniti, D.; Aleves, D.A. & Alcock, C. RR lyrae in front of the LMC; implications for microlensing, article, April 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc684393/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.