Results 61 to 70 of about 402,684 (314)
Evolution of dwarf galaxies: a dynamical perspective [PDF]
Astronomy & Astrophysics, 2014 For a rotating galaxy, the inner circular-velocity gradient d_{R}V(0) provides a direct estimate of the central dynamical mass density, including gas, stars, and dark matter. We consider 60 low-mass galaxies with high-quality HI and/or stellar rotation curves (including starbursting dwarfs, irregulars, and spheroidals), and estimate d_{R}V(0) as V(R_d)/
Federico Lelli +2 more
openaire +4 more sources
The cores of dwarf galaxy haloes [PDF]
Monthly Notices of the Royal Astronomical Society, 1996 We use N-body simulations to examine the effects of mass outflows on the density profiles of cold dark matter (CDM) halos surrounding dwarf galaxies. In particular, we investigate the consequences of supernova-driven winds that expel a large fraction of the baryonic component from a dwarf galaxy disk after a vigorous episode of star formation.
Navarro, Julio F. +2 more
openaire +2 more sources
A Comparison of Outflow Properties in AGN Dwarfs versus Star-forming Dwarfs
The Astrophysical Journal, 2023 Feedback likely plays a crucial role in resolving discrepancies between observations and theoretical predictions of dwarf galaxy properties. Stellar feedback was once believed to be sufficient to explain these discrepancies, but it has thus far failed to
Archana Aravindan +7 more
doaj +1 more source
Ultradiffuse galaxies: the high-spin tail of the abundant dwarf galaxy population [PDF]
, 2016 Recent observations have revealed the existence of an abundant population of faint, low surface brightness (SB) galaxies, which appear to be numerous and ubiquitous in nearby galaxy clusters, including the Virgo, Coma and Fornax clusters.
N. Amorisco, Abraham Loeb
semanticscholar +1 more source
At the survey limits: discovery of the Aquarius 2 dwarf galaxy in the VST ATLAS and the SDSS data [PDF]
, 2016 We announce the discovery of the Aquarius 2 dwarf galaxy, a new distant satellite of the Milky Way, detected on the fringes of the VLT Survey Telescope (VST) ATLAS and the Sloan Digital Sky Survey (SDSS) surveys.
G. Torrealba +9 more
semanticscholar +1 more source
Direct evidence of hierarchical assembly at low masses from isolated dwarf galaxy groups [PDF]
Nature Astronomy, 2017 The demographics of dwarf galaxy populations have long been in tension with predictions from the Λ cold dark matter (ΛCDM) paradigm1–4. If primordial density fluctuations were scale-free as predicted, dwarf galaxies should themselves host dark-matter ...
S. Stierwalt +7 more
semanticscholar +1 more source
Dwarf spheroidal galaxies: Keystones of galaxy evolution [PDF]
Publications of the Astronomical Society of the Pacific, 1994 Dwarf spheroidal galaxies are the most insignificant extragalactic stellar systems in terms of their visibility, but potentially very significant in terms of their role in the formation and evolution of much more luminous galaxies. We discuss the present observational data and their implications for theories of the formation and evolution of both dwarf
Gallagher III, John S. +1 more
openaire +2 more sources
UGC 7639: A Dwarf Galaxy in the Canes Venatici I Cloud
Advances in Astronomy, 2015 We want to get insight into the formation mechanism and the evolution of UGC 7639, a dwarf galaxy in the Canes Venatici I Cloud (CVnIC). We used archival multiwavelength data to constrain its global properties. Ultraviolet images show that UGC 7639 inner
L. M. Buson +3 more
doaj +1 more source
The M 101 group complex: new dwarf galaxy candidates and spatial structure [PDF]
, 2017 Context. The fine details of the large-scale structure in the local Universe provide important empirical benchmarks for testing cosmological models of structure formation. Dwarf galaxies are key object for such studies. Aims.
O. Muller +3 more
semanticscholar +1 more source
Warp or lag? The ionized and neutral hydrogen gas in the edge-on dwarf galaxy UGC 1281 [PDF]
, 2011 The properties of gas in the halos of galaxies constrain global models of the interstellar medium. Kinematical information is of particular interest since it is a clue to the origin of the gas. Until now mostly massive galaxies have been investigated for
Barbieri +40 more
core +3 more sources