TY - JOUR
T1 - The Next Generation Virgo Cluster Survey. XXXIV. Ultracompact Dwarf Galaxies in the Virgo Cluster
AU - Liu, Chengze
AU - Côté, Patrick
AU - Peng, Eric W.
AU - Roediger, Joel
AU - Zhang, Hongxin
AU - Ferrarese, Laura
AU - Sánchez-Janssen, Ruben
AU - Guhathakurta, Puragra
AU - Yang, Xiaohu
AU - Jing, Yipeng
AU - Alamo-Martínez, Karla
AU - Blakeslee, John P.
AU - Boselli, Alessandro
AU - Cuilandre, Jean Charles
AU - Duc, Pierre Alain
AU - Durrell, Patrick
AU - Gwyn, Stephen
AU - Jordán, Andres
AU - Ko, Youkyung
AU - Lancon, Ariane
AU - Lim, Sungsoon
AU - Longobardi, Alessia
AU - Mei, Simona
AU - Mihos, J. Christopher
AU - Muoz, Roberto
AU - Powalka, Mathieu
AU - Puzia, Thomas
AU - Spengler, Chelsea
AU - Toloba, Elisa
N1 - Publisher Copyright:
© 2020. The Author(s). Published by the American Astronomical Society..
PY - 2020/9
Y1 - 2020/9
N2 - We present a study of ultracompact dwarf (UCD) galaxies in the Virgo cluster based mainly on imaging from the Next Generation Virgo Cluster Survey (NGVS). Using ∼100 deg2 of u∗giz imaging, we have identified more than 600 candidate UCDs, from the core of Virgo out to its virial radius. Candidates have been selected through a combination of magnitudes, ellipticities, colors, surface brightnesses, half-light radii, and, when available, radial velocities. Candidates were also visually validated from deep NGVS images. Subsamples of varying completeness and purity have been defined to explore the properties of UCDs and compare to those of globular clusters and the nuclei of dwarf galaxies with the aim of delineating the nature and origins of UCDs. From a surface density map, we find the UCDs to be mostly concentrated within Virgo's main subclusters, around its brightest galaxies. We identify several subsamples of UCDs-i.e., the brightest, largest, and those with the most pronounced and/or asymmetric envelopes-that could hold clues to the origin of UCDs and possible evolutionary links with dwarf nuclei. We find some evidence for such a connection from the existence of diffuse envelopes around some UCDs and comparisons of radial distributions of UCDs and nucleated galaxies within the cluster.
AB - We present a study of ultracompact dwarf (UCD) galaxies in the Virgo cluster based mainly on imaging from the Next Generation Virgo Cluster Survey (NGVS). Using ∼100 deg2 of u∗giz imaging, we have identified more than 600 candidate UCDs, from the core of Virgo out to its virial radius. Candidates have been selected through a combination of magnitudes, ellipticities, colors, surface brightnesses, half-light radii, and, when available, radial velocities. Candidates were also visually validated from deep NGVS images. Subsamples of varying completeness and purity have been defined to explore the properties of UCDs and compare to those of globular clusters and the nuclei of dwarf galaxies with the aim of delineating the nature and origins of UCDs. From a surface density map, we find the UCDs to be mostly concentrated within Virgo's main subclusters, around its brightest galaxies. We identify several subsamples of UCDs-i.e., the brightest, largest, and those with the most pronounced and/or asymmetric envelopes-that could hold clues to the origin of UCDs and possible evolutionary links with dwarf nuclei. We find some evidence for such a connection from the existence of diffuse envelopes around some UCDs and comparisons of radial distributions of UCDs and nucleated galaxies within the cluster.
UR - https://www.scopus.com/pages/publications/85091703461
U2 - 10.3847/1538-4365/abad91
DO - 10.3847/1538-4365/abad91
M3 - Article
AN - SCOPUS:85091703461
SN - 0067-0049
VL - 250
JO - Astrophysical Journal, Supplement Series
JF - Astrophysical Journal, Supplement Series
IS - 1
M1 - 17
ER -