Is the large magellanic cloud microlensing due to an intervening dwarf galaxy?

C. Alcock, R. A. Allsman, D. R. Alves, T. S. Axelrod, A. C. Becker, D. P. Bennett, K. H. Cook, K. C. Freeman, K. Griest, M. J. Lehner, S. L. Marshall, D. Minniti, B. A. Peterson, M. R. Pratt, P. J. Quinn, A. W. Rodgers, A. Rorabeck, C. W. Stubbs, W. Sutherland, A. B. TomaneyT. Vandehei, D. L. Welch

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

The recent suggestion that the microlensing events observed toward 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 turnoff of such a hypothetical galaxy. We conclude that if the lenses are in a foreground galaxy, it must be a particularly dark galaxy.

Original languageEnglish
Pages (from-to)L59-L63
JournalAstrophysical Journal
Volume490
Issue number1 PART II
DOIs
Publication statusPublished - 1997

Keywords

  • Galaxies: individual (Large Magellanic Cloud, Sagittarius)
  • Galaxy: halo
  • Stars: individual (RR Lyrae)
  • Stars: variables: other

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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