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Constraints on mass loss of globular clusters in dwarf galaxies
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The Fornax dwarf spheroidal galaxy is well known for its very high globular cluster specific frequency, SN=26. Furthermore, while the field star metallicity distribution peaks at [Fe/H]=-1, four of the five GCs have [Fe/H]<-2. Only about 5 percent of the field stars have such low metallicities. Hence, a very large fraction of about 1/5-1/4 of the most metal-poor stars belong to the four most metal-poor GCs. This implies that these clusters could, at most, have been a factor of 4-5 more massive initially. A second, even more extreme case may be the IKN dwarf galaxy where SN=124. Although metallicities are not accurately known, the GCs account for about 13 percent of the total V-band luminosity of IKN.
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Why do some Ultra Diffuse Galaxies have Rich Globular Cluster Systems?
A two-parameter model shows that ultra diffuse galaxies with globular cluster mass fractions near 10% likely formed clusters very efficiently while destroying only a modest fraction of them.
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