Results 21 to 30 of about 12,741,185 (402)
Implications of the Milky Way Travel Velocity for Dynamical Mass Estimates of the Local Group
The Astrophysical Journal, 2022 The total mass of the Local Group (LG) is a fundamental quantity that enables interpreting the orbits of its constituent galaxies and placing the LG in a cosmological context.
Katie Chamberlain +6 more
doaj +1 more source
Dwarf Galaxy Discoveries from the KMTNet Supernova Program. I. The NGC 2784 Galaxy Group [PDF]
, 2017 We present BVI surface photometry of 31 dwarf galaxy candidates discovered in a deep image stack from the KMTNet Supernova Program of ∼30 square degrees centered on the nearby NGC 2784 galaxy group. Our final images have a 3σ surface brightness detection
H. S. Park +7 more
semanticscholar +1 more source
The Astronomical Journal, 2015 Galaxy groups can be characterized by the radius of decoupling from cosmic expansion, the radius of the caustic of second turnaround, and the velocity dispersion of galaxies within this latter radius. These parameters can be a challenge to measure, especially for small groups with few members.
openaire +2 more sources
Galaxy interactions II: High density environments [PDF]
, 2011 With the aim to assess the role of dense environments in galaxy interactions, properties we present an analysis of close galaxy pairs in groups and clusters, obtained from the Sloan Digital Sky Survey Data Release 7 (SDSS-DR7).
Abazajian +64 more
core +1 more source
Compact Groups Of Galaxies [PDF]
Symposium - International Astronomical Union, 1997 This paper reviews some of the outstanding questions concerning compact groups of galaxies. These relate to the physical nature and dynamical status of the groups, their formation and evolution, and their role in galaxy evolution. The picture that emerges is that compact groups are generally physically dense systems, although often contaminated by ...
openaire +4 more sources
Ionised gas structure of 100 kpc in an over-dense region of the galaxy group COSMOS-Gr30 at z ~ 0.7 [PDF]
, 2017 We report the discovery of a 10^4 kpc^2 gaseous structure detected in [OII] in an over-dense region of the COSMOS-Gr30 galaxy group at z~0.725 thanks to deep MUSE Guaranteed Time Observations.
B. Epinat +18 more
semanticscholar +1 more source
Probing the intra-group medium of a z = 0.28 galaxy group [PDF]
, 2016 We present new MUSE observations of a galaxy group probed by a background quasar. The quasar sightline passes between multiple z = 0.28 galaxies, whilst showing at the same redshift low-ionized metal line species, including Ca II, Mg I, Mg II and Fe II ...
R. Bielby +6 more
semanticscholar +1 more source
Studying the late evolution of a radio-loud AGN in a galaxy group with LOFAR [PDF]
, 2017 Feedback by radio-loud active galactic nuclei (AGNs) in galaxy groups is not fully understood. Open questions include the duty cycle of the AGN, the spatial extent of the radio lobes, the effect they have on the intragroup medium and the fate of the ...
F. Savini +19 more
semanticscholar +1 more source
A New Galaxy in the Local Group: the Antlia Dwarf Galaxy [PDF]
, 1997 We report the discovery of new member of the Local Group in the constellation of Antlia. Optically the system appears to be a typical dwarf spheroidal galaxy of type dE3.5 with no apparent young blue stars or unusual features.
Hau, George K. T. +2 more
core +2 more sources
Highlights of Astronomy, 1977 I would like to report on some work that Ed Turner and I have done on groups of galaxies and how groups may be used to obtain useful cosmological information. Of course the classic study of groups of galaxies was done by de Vaucouleurs (1975) who made a catalogue of groups and loose associations of galaxies in the local supercluster. Partly to obtain a
openaire +2 more sources