GLOBULAR CLUSTER POPULATIONS: RESULTS INCLUDING S4G LATE-TYPE GALAXIES

Dennis Zaritsky, Kelsey McCabe, Manuel Aravena, E. Athanassoula, Albert Bosma, Sébastien Comerón, Helene M. Courtois, Bruce G. Elmegreen, Debra M. Elmegreen, Santiago Erroz-Ferrer, Dimitri A. Gadotti, Joannah L. Hinz, Luis C. Ho, Benne Holwerda, Taehyun Kim, Johan H. Knapen, Jarkko Laine, Eija Laurikainen, Juan Carlos Muñoz-Mateos, Heikki SaloKartik Sheth

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Using 3.6 and 4.5 μm images of 73 late-type, edge-on galaxies from the S4G 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, 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 109M of galaxy stellar mass, TN, on M. For 8.5 < log(M/M < 10.5 we find the relationship can be satisfactorily described as TN=(M/106.7)-0.56 when 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 TN 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 ∼ 1010.8M) 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 TN and large-scale environment, but we do find a tendency for galaxies of fixed M to have larger TN if they have converted a larger proportion of their baryons into stars.

Original languageEnglish (US)
Article number99
JournalAstrophysical Journal
Volume818
Issue number1
DOIs
StatePublished - Feb 10 2016

Keywords

  • galaxies: evolution
  • galaxies: star clusters: general
  • galaxies: stellar content

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Zaritsky, D., McCabe, K., Aravena, M., Athanassoula, E., Bosma, A., Comerón, S., Courtois, H. M., Elmegreen, B. G., Elmegreen, D. M., Erroz-Ferrer, S., Gadotti, D. A., Hinz, J. L., Ho, L. C., Holwerda, B., Kim, T., Knapen, J. H., Laine, J., Laurikainen, E., Muñoz-Mateos, J. C., ... Sheth, K. (2016). GLOBULAR CLUSTER POPULATIONS: RESULTS INCLUDING S4G LATE-TYPE GALAXIES. Astrophysical Journal, 818(1), [99]. https://doi.org/10.3847/0004-637X/818/1/99