A Puzzle Involving Galactic Bulge Microlensing Events

Details A Puzzle Involving Galactic Bulge Microlensing Events A Puzzle Involving Galactic Bulge Microlensing Events

2009-11-27

arxiv.org/abs/0911.5081v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Submitted to ApJL, table 2 (quite long) will only appear in the on-line version of ApJL

Scientific paper

We study a sample of 16 microlensed Galactic bulge main sequence turnoff region stars for which high dispersion spectra have been obtained with detailed abundance analyses. We demonstrate that there is a very strong and highly statistically significant correlation between the maximum magnification of the microlensed bulge star and the value of the [Fe/H] deduced from the high resolution spectrum of each object. Physics demands that this correlation, assuming it to be real, be the result of some sample bias. We suggest several possible explanations, but are forced to reject them all,and are left puzzled. To obtain a reliable metallicity distribution in the Galactic bulge based on microlensed dwarf stars it will be necessary to resolve this issue through the course of additional observations.

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