TY - JOUR
T1 - The next generation virgo cluster survey. X. Properties of ultra-compact dwarfs in the M87, M49, and M60 regions
AU - Liu, Chengze
AU - Peng, Eric W.
AU - Côté, Patrick
AU - Ferrarese, Laura
AU - Jordán, Andrés
AU - Mihos, J. Christopher
AU - Zhang, Hong Xin
AU - Muñoz, Roberto P.
AU - Puzia, Thomas H.
AU - Lanɥon, Ariane
AU - Gwyn, Stephen
AU - Cuillandre, Jean Charles
AU - Blakeslee, John P.
AU - Boselli, Alessandro
AU - Durrell, Patrick R.
AU - Duc, Pierre Alain
AU - Guhathakurta, Puragra
AU - Macarthur, Lauren A.
AU - Mei, Simona
AU - Sánchez-Janssen, Rubén
AU - Xu, Haiguang
N1 - Publisher Copyright:
© 2015. The American Astronomical Society. All rights reserved..
PY - 2015/10/10
Y1 - 2015/10/10
N2 - We use imaging from the Next Generation Virgo cluster Survey (NGVS) to present a comparative study of ultra-compact dwarf (UCD) galaxies associated with three prominent Virgo sub-clusters: those centered on the massive red-sequence galaxies M87, M49, and M60. We show how UCDs can be selected with high completeness using a combination of half-light radius and location in color-color diagrams (u∗iKs or u∗gz). Although the central galaxies in each of these sub-clusters have nearly identical luminosities and stellar masses, we find large differences in the sizes of their UCD populations, with M87 containing ∼3.5 and 7.8 times more UCDs than M49 and M60, respectively. The relative abundance of UCDs in the three regions scales in proportion to sub-cluster mass, as traced by X-ray gas mass, total gravitating mass, number of globular clusters (GCs), and number of nearby galaxies. We find that the UCDs are predominantly blue in color, with ∼85% of the UCDs having colors similar to blue GCs and stellar nuclei of dwarf galaxies. We present evidence that UCDs surrounding M87 and M49 may follow a morphological sequence ordered by the prominence of their outer, low surface brightness envelope, ultimately merging with the sequence of nucleated low-mass galaxies, and that envelope prominence correlates with distance from either galaxy. Our analysis provides evidence that tidal stripping of nucleated galaxies is an important process in the formation of UCDs.
AB - We use imaging from the Next Generation Virgo cluster Survey (NGVS) to present a comparative study of ultra-compact dwarf (UCD) galaxies associated with three prominent Virgo sub-clusters: those centered on the massive red-sequence galaxies M87, M49, and M60. We show how UCDs can be selected with high completeness using a combination of half-light radius and location in color-color diagrams (u∗iKs or u∗gz). Although the central galaxies in each of these sub-clusters have nearly identical luminosities and stellar masses, we find large differences in the sizes of their UCD populations, with M87 containing ∼3.5 and 7.8 times more UCDs than M49 and M60, respectively. The relative abundance of UCDs in the three regions scales in proportion to sub-cluster mass, as traced by X-ray gas mass, total gravitating mass, number of globular clusters (GCs), and number of nearby galaxies. We find that the UCDs are predominantly blue in color, with ∼85% of the UCDs having colors similar to blue GCs and stellar nuclei of dwarf galaxies. We present evidence that UCDs surrounding M87 and M49 may follow a morphological sequence ordered by the prominence of their outer, low surface brightness envelope, ultimately merging with the sequence of nucleated low-mass galaxies, and that envelope prominence correlates with distance from either galaxy. Our analysis provides evidence that tidal stripping of nucleated galaxies is an important process in the formation of UCDs.
UR - http://www.scopus.com/inward/record.url?scp=84946047745&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84946047745&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/812/1/34
DO - 10.1088/0004-637X/812/1/34
M3 - Article
AN - SCOPUS:84946047745
SN - 0004-637X
VL - 812
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 34
ER -