Results 1 to 10 of about 159,269 (219)
Dwarf Spheroidal Satellite Formation in a Reionized Local Group [PDF]
, 2013 Dwarf spheroidal satellite galaxies have emerged a powerful probe of small-scale dark matter clustering and of cosmic reionization. They exhibit structural and chemical continuity with dwarf irregular galaxies in the field and with spheroidal galaxies in high-density environments. By combining empirical constraints derived for star formation at low gas
Bromm, Volker, Milosavljevic, Milos
arxiv +4 more sources
Globular Clusters and Dwarf Spheroidal Galaxies [PDF]
, 2007 Traditionally globular clusters and dwarf spheroidal galaxies have been distinguished by using one or more of the following criteria: (1) mass, (2) luminosity, (3) size, (4) mass-to-light ratio and (5) spread in metallicity. However, a few recently discovered objects show some overlap between the domains in parameter space that are occupied by galaxies
Babcock H. W. +3 more
arxiv +3 more sources
Are Dwarf Spheroidal Galaxies Dark Matter Dominated or Remnants of Disrupted Larger Satellite Galaxies? A Possible Test [PDF]
Astrophys.J. 566 (2002) 838-844, 2002 The failure of standard cosmolocical models in accounting for the statistics of dwarf satellites and the rotation curve of gas-rich dwarf galaxies in detail has led us to examine whether earlier non-equilibrium models of dwarf spheroidal satellites without any dark matter should be reconsidered in more detail.
Ralf S. Klessen, Hongsheng Zhao
openalex +2 more sources
Abundance ratios of red giants in low mass ultra faint dwarf spheroidal galaxies [PDF]
A&A 588, A7 (2016), 2015 Low mass dwarf spheroidal galaxies are key objects for our understanding of the chemical evolution of the pristine Universe and the Local Group of galaxies. Abundance ratios in stars of these objects can be used to better understand their star formation and chemical evolution.
Bidin, C. Moni +5 more
arxiv +6 more sources
Young Globular Clusters and Dwarf Spheroidals [PDF]
, 1999 Most of the globular clusters in the main body of the Galactic halo were formed almost simultaneously. However, globular cluster formation in dwarf spheroidal galaxies appears to have extended over a significant fraction of a Hubble time. This suggests that the factors which suppressed late-time formation of globulars in the main body of the Galactic ...
Ambartsumian V. A. +10 more
arxiv +4 more sources
Dependence of stellar substructures in M31 type galaxy on satellite morphology in galaxy mergers [PDF]
Serbian Astronomical Journal, 2022 Stellar streams and shells are observed in halos of spiral galaxies. In this paper, we investigated the formation of these structures due to mergers between the host spiral galaxy and its dwarf satellite galaxies.
Milošević S.
doaj +1 more source
Laboratory exploration of mineral precipitates from Europa's subsurface ocean
Journal of Applied Crystallography, Volume 54, Issue 5, Page 1455-1479, October 2021., 2021 Precipitation experiments from a model Europan ocean solution subjected to fast and slow freezing suggest that the highly hydrated Na–Mg sulfate phase Na2Mg(SO4)2·16H2O is one of the lowest‐temperature mineral phases likely to be stable on Europa's surface and may therefore be astrobiologically significant.The precipitation of hydrated phases from a ...
Stephen P. Thompson +5 more
wiley +1 more source
Journal of Geophysical Research: Planets, Volume 126, Issue 5, May 2021., 2021 Abstract The origin of the interstellar object 1I/‘Oumuamua has defied explanation. In a companion paper (Jackson & Desch, 2021), we show that a body of N2 ice with axes 45 m × 44 m × 7.5 m at the time of observation would be consistent with its albedo, nongravitational acceleration, and lack of observed CO or CO2 or dust.
S. J. Desch, A. P. Jackson
wiley +1 more source
Annihilating dark matter search with 12 years of Fermi LAT data in nearby galaxy clusters
SciPost Physics Proceedings, 2023 Galaxy clusters contain an abundance of dark matter making them attractive laboratories for indirect DM searches. This work details a search for signals of pair annihilation from WIMP dark matter in the GeV gamma ray regime.
Charles Thorpe-Morgan, D. Malyshev, C.-A. Stegen, Andrea Santangelo, J. Jochum
doaj +1 more source
The Astrophysical Journal, 2023 Dwarf galaxies located in extremely underdense cosmic voids are excellent test beds for disentangling the effects of large-scale environments on galaxy formation and evolution. We present the first results of the Dwarfs in Void Environments Survey, which
Mithi A. C. de los Reyes +5 more
doaj +1 more source