Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-01
Astronomy and Astrophysics
Astrophysics
9 pages, 4 figures, accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20066786
We test whether the universal initial mass function (UIMF) or the integrated galaxial IMF (IGIMF) can be employed to explain the metallicity distribution (MD) of giants in the Galactic bulge. We make use of a single-zone chemical evolution model developed for the Milky Way bulge in the context of an inside-out model for the formation of the Galaxy. We checked whether it is possible to constrain the yields above $80 M_{\sun}$ by forcing the UIMF and required that the resulting MD matches the observed ones. We also extended the analysis to the bulge of M31 to investigate a possible variation of the IMF among galactic bulges. Several parameters that have an impact on stellar evolution (star-formation efficiency, gas infall timescale) are varied. We show that it is not possible to satisfactorily reproduce the observed metallicity distribution in the two galactic bulges unless assuming a flatter IMF ($x \leq 1.1$) than the universal one. We conlude that it is necessary to assume a variation in the IMF among the various environments.
Ballero Silvia Kuna
Kroupa Pavel
Matteucci Francesca
No associations
LandOfFree
Testing the universal stellar IMF on the metallicity distribution in the bulges of the Milky Way and M31 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Testing the universal stellar IMF on the metallicity distribution in the bulges of the Milky Way and M31, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Testing the universal stellar IMF on the metallicity distribution in the bulges of the Milky Way and M31 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-675551