SIMBAD references

2015MNRAS.451.2625P - Mon. Not. R. Astron. Soc., 451, 2625-2639 (2015/August-2)

The SLUGGS survey: combining stellar and globular cluster metallicities in the outer regions of early-type galaxies.

PASTORELLO N., FORBES D.A., USHER C., BRODIE J.P., ROMANOWSKY A.J., STRADER J., SPITLER L.R., ALABI A.B., FOSTER C., JENNINGS Z.G., KARTHA S.S. and POTA V.

Abstract (from CDS):

The outer halo regions of early-type galaxies carry key information about their past accretion history. However, spectroscopically probing the stellar component at such galactocentric radii is still challenging. Using the DEep Imaging Multi-Object Spectrograph on the Keck, we have been able to measure the metallicities of the stellar and globular cluster components in 12 early-type galaxies out to more than 10Re. We find similar metallicity gradients for the metal-poor and metal-rich globular cluster subpopulations, suggesting a common formation process for the two subpopulations. This is in conflict with most current theoretical predictions, where the metal-poor globular clusters are thought to be purely accreted and metal-rich globular clusters mostly formed in situ. Moreover, we find that the globular cluster metallicity gradients show a trend with galaxy mass, being steeper in lower mass galaxies than in higher mass galaxies. This is similar to what we find for the outermost galaxy stars and suggests a more active accretion history, with a larger role played by major mergers, in the most massive galaxies. This conclusion is qualitatively consistent with expectations from two-phase galaxy assembly models. Finally, we find that the small difference in metallicity between galaxy stars and metal-rich globular clusters at 1Re may correlate with galaxy mass. The origin of this difference is not currently clear.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): galaxies: abundances - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: formation - galaxies: star clusters: general - galaxies: stellar content

VizieR on-line data: <Available at CDS (J/MNRAS/451/2625): table1.dat table3.dat>

Nomenclature: Table 2: [PFU2015] NGC4473 GCNN (Nos 1-59), [PFU2015] NGC1023 GCNN (Nos 1-39). [PFR2013] NGC3115 GCNNN (No 151) added, [PBB2015] NNN N=2 (Nos 432-433) added.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 16

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2021.07.30-18:47:38

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