Magnitude Bias of Microlensed Sources toward the Large Magellanic Cloud

Hongsheng Zhao, David S Graff, Puragra Guhathakurta

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

There are lines of evidence suggesting that some of the observed microlensing events in the direction of the Large Magellanic Cloud (LMC) are caused by ordinary star lenses as opposed to dark MACHOs in the Galactic halo. Efficient lensing by ordinary stars generally requites the presence of one or more additional concentrations of stars along the line of sight to the LMC disk. If such a population behind the LMC disk exists, then the source stars (for lensing by LMC disk objects) will be drawn preferentially from the background population and will show systematic differences from LMC field stars. One such difference is that the (lensed) source stars will be farther away than the average LMC field stars, and this should be reflected in their apparent baseline magnitudes. We focus on red clump stars; these should appear in the color-magnitude diagram at a few tenths of a magnitude fainter than the field red clump. Suggestively, one of the two near-clump confirmed events, MACHO-LMC-1, is a few tenths of magnitude fainter than the clump.

Original languageEnglish
Pages (from-to)L37-L40
Number of pages4
JournalAstrophysical Journal
Volume532
Issue number1
Publication statusPublished - 20 Mar 2000

Keywords

  • galaxy : structure
  • magellanic clouds
  • GALACTIC HALO
  • STARS
  • MACHOS

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