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Date and Time of the Query: 2019-04-22 T14:08:13 PDT
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For refcode 2015ApJ...799..159Z:
Retrieve 97 NED objects in this reference.
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2015ApJ...799..159Z Globular Cluster Populations: First Results from S^4^G Early-type Galaxies Zaritsky, Dennis; Aravena, Manuel; Athanassoula, E.; Bosma, Albert; Comeron, Sebastien; Elmegreen, Bruce G.; Erroz-Ferrer, Santiago; Gadotti, Dimitri A.; Hinz, Joannah L.; Ho, Luis C.; Holwerda, Benne; Knapen, Johan H.; Laine, Jarkko; Laurikainen, Eija; Munoz-Mateos, Juan Carlos; Salo, Heikki; Sheth, Kartik Abstract. Using 3.6 micron images of 97 early-type galaxies, we develop and verify methodology to measure globular cluster populations from the S^4^G survey images. We find that (1) the ratio, T_N_, of the number of clusters, N_CL_, to parent galaxy stellar mass, M_*_, rises weakly with M_*_ for early-type galaxies with M_*_ > 10^10^ M_sun_ when we calculate galaxy masses using a universal stellar initial mass function (IMF) but that the dependence of T_N_ on M_*_ is removed entirely once we correct for the recently uncovered systematic variation of IMF with M_*_; and (2) for M_*_ < 10^10^ M_sun_, there is no trend between N_CL_ and M_*_, the scatter in T_N_ is significantly larger (approaching two orders of magnitude), and there is evidence to support a previous, independent suggestion of two families of galaxies. The behavior of N_CL_ in the lower-mass systems is more difficult to measure because these systems are inherently cluster-poor, but our results may add to previous evidence that large variations in cluster formation and destruction efficiencies are to be found among low-mass galaxies. The average fraction of stellar mass in clusters is ~0.0014 for M_*_ > 10^10^ M_sun_ and can be as large as ~0.02 for less massive galaxies. These are the first results from the S^4^G sample of galaxies and will be enhanced by the sample of early-type galaxies now being added to S^4^G and complemented by the study of later-type galaxies within S^4^G. Key words: galaxies: evolution, galaxies: formation, galaxies: star clusters: general, galaxies: stellar content
Retrieve 97 NED objects in this reference.
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