The Initial Mass Function of the Galactic Bulge

Details The Initial Mass Function of the Galactic Bulge The Initial Mass Function of the Galactic Bulge

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7891r&link_type=abstract

HST Proposal ID #7891

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Hst Proposal Id #7891 Galaxies

Scientific paper

We propose to measure the complete Galactic bulge luminosity function {LF} with signal-to-noise ratio 10 at H eq 25, corresponding to M_H eq 10.4 i.e., the end of the main sequence. This offers a unique clue to better understanding the complete stellar content, and hence the stellar mass-to- light ratio, of spiral bulges and by extension of ellipticals as well. This LF can be directly converted into an initial mass function {IMF} via the empirical mass-M_ H relation. This IMF will also allow one to clarify whether the excess of short duration microlensing events seen toward the bulge is due to low-mass stars or brown dwarfs or other more exotic objects. In addition the bulge LF can be directly compared with the LF in the solar neighborhood, and determine to which extent star formation at similar metallicities but radically different environmental conditions yields the same IMF.

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