SIMBAD references

2005ApJ...627..203H - Astrophys. J., 627, 203-223 (2005/July-1)

The ACS Virgo cluster survey. VII. Resolving the connection between globular clusters and ultracompact dwarf galaxies.

HASEGAN M., JORDAN A., COTE P., DJORGOVSKI S.G., McLAUGHLIN D.E., BLAKESLEE J.P., MEI S., WEST M.J., PENG E.W., FERRARESE L., MILOSAVLJEVIC M., TONRY J.L. and MERRITT D.

Abstract (from CDS):

We investigate the connection between globular clusters and ultracompact dwarf galaxies (UCDs) by examining the properties of 10 compact, high-luminosity (-11.8≲MV≲-10.8) objects associated with M87 (NGC 4486, VCC 1316), the cD galaxy in the Virgo Cluster. These objects, most of which were previously classified as M87 globular clusters, were selected from a combination of ground- and space-based imaging surveys. Our observational database for these objects–which we term DGTOs, or ``dwarf-globular transition objects''–includes Advanced Camera for Surveys (ACS) F475W and F850LP imaging from the ACS Virgo Cluster Survey, integrated-light spectroscopy from Keck/ESI, and archival F606W WFPC2 imaging. We also present a search for DGTOs associated with other galaxies based on ACS imaging for 100 early-type galaxies in Virgo. Our main findings can be summarized as follows: These results show that distinguishing bona fide UCDs from high-luminosity globular clusters requires a careful analysis of their detailed structural and dynamical properties, particularly their mass-to-light ratios. In general, the properties of the UCDs in our sample are consistent with models in which these objects form through tidal stripping of nucleated dwarf galaxies.

Abstract Copyright:

Journal keyword(s): Galaxies: Clusters: Individual: Name: Virgo - Galaxies: Dwarf - Galaxies: Formation - Galaxies: Star Clusters - Stars: Kinematics

Nomenclature: Table 9: [HJC2005] NNNN-N N=18.

Simbad objects: 48

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