A1 Refereed original research article in a scientific journal
GLOBULAR CLUSTER POPULATIONS: RESULTS INCLUDING S(4)G LATE-TYPE GALAXIES
Authors: Zaritsky D, McCabe K, Aravena M, Athanassoula E, Bosma A, Comeron S, Courtois HM, Elmegreen BG, Elmegreen DM, Erroz-Ferrer S, Gadotti DA, Hinz JL, Ho LC, Holwerda B, Kim T, Knapen JH, Laine J, Laurikainen E, Munoz-Mateos JC, Salo H, Sheth K
Publisher: IOP PUBLISHING LTD
Publication year: 2016
Journal: Astrophysical Journal
Journal name in source: ASTROPHYSICAL JOURNAL
Journal acronym: ASTROPHYS J
Article number: ARTN 99
Volume: 818
Issue: 1
Number of pages: 11
ISSN: 0004-637X
eISSN: 1538-4357
DOI: https://doi.org/10.3847/0004-637X/818/1/99
Using 3.6 and 4.5 mu m images of 73 late-type, edge-on galaxies from the S(4)G survey, we compare the richness of the globular cluster populations of these galaxies to those of early-type galaxies that we measured previously. In general, the galaxies presented here fill in the distribution for galaxies with lower stellar mass, M-*, specifically log(M-*/M-circle dot) < 10, overlap the results for early-type galaxies of similar masses, and, by doing so, strengthen the case for a dependence of the number of globular clusters per 10(9)M(circle dot) of galaxy stellar mass, T-N, on M-*. For 8.5 < log(M-*/M-circle dot) < 10.5 we find the relationship can be satisfactorily described as T-N = (M-*/10(6.7))(-0.56) M-* is expressed in solar masses. The functional form of the relationship is only weakly constrained, and extrapolation outside this range is not advised. Our late-type galaxies, in contrast to our early types, do not show the tendency for low-mass galaxies to split into two T-N families. Using these results and a galaxy stellar mass function from the literature, we calculate that, in a volume-limited, local universe sample, clusters are most likely to be found around fairly massive galaxies (M-* similar to 10(10.8)M(circle dot)) and present a fitting function for the volume number density of clusters as a function of parent-galaxy stellar mass. We find no correlation between T-N and large-scale environment, but we do find a tendency for galaxies of fixed M-* to have larger T-N if they have converted a larger proportion of their baryons into stars.
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