Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21333106w&link_type=abstract
American Astronomical Society, AAS Meeting #213, #331.06; Bulletin of the American Astronomical Society, Vol. 41, p.391
Other
Scientific paper
We present an analysis of a 50 orbit HST ACS observation of the globular cluster system and use the extraordinary depth of this dataset to test whether the colors and magnitudes show evidence for a mass-metallicity relation. We find only a weak relation between the colors and magnitudes of the metal poor subpopulation of globular clusters over a wide range in luminosity from M_V=-11 to M_V=-6 The constancy of the colors of the metal-poor subpopulation seen in
our 50 orbit observation is in contrast to suggestions from single orbit ACS data that the metal-poor globular clusters in M87 and several other galaxies show a ``blue tilt.'' The formal best fit for the mass-metallicity relation for the metal-poor subpopulation in our much deeper data is Z M^{0.08 ± 0.05},strongly limiting self-enrichment within globular clusters. We specifically test for a wide range of systematic effects and find that while small tilts cannot be confirmed or rejected, the data place a strong upper limit to any tilt of [[Unable to Display Character: |]] 0.20 [[Unable to Display Character: |]] ± 0.05. This mass-metallicity relation for globular clusters also appears to be shallower than the relation for galaxies, suggesting that the formation mechanisms for these two types of objects are different.
Baltz Edward A.
Lauer Tod R.
Waters Christopher Z.
Zepf Stephen E.
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