Results 41 to 50 of about 11,545 (216)
On the Origins of Extreme Velocity Stars as Revealed by Large-scale Galactic Surveys
The Astronomical Journal, 2023 We assemble a large sample of 12,784 high-velocity stars with total velocity V _GSR ≥ 300 km s ^−1 , selected from RAVE DR5, SDSS DR12, LAMOST DR8, APOGEE DR16, GALAH DR2, and Gaia EDR3.
Qing-Zheng Li +5 more
doaj +1 more source
An Observational Limit on the Dwarf Galaxy Population of the Local Group [PDF]
, 2006 We present the results of an all-sky, deep optical survey for faint Local Group dwarf galaxies. Candidate objects were selected from the second Palomar survey (POSS-II) and ESO/SRC survey plates and follow-up observations performed to determine whether ...
Alan B. Whiting +10 more
core +2 more sources
Warm Dark Matter Sterile Neutrinos in Electron Capture and Beta Decay Spectra
Advances in High Energy Physics, Volume 2016, Issue 1, 2016., 2016 We briefly review the motivation to search for sterile neutrinos in the keV mass scale, as dark matter candidates, and the prospects to find them in beta decay or electron capture spectra, with a global perspective. We describe the fundamentals of the neutrino flavor‐mass eigenstate mismatch that opens the possibility of detecting sterile neutrinos in ...
O. Moreno +3 more
wiley +1 more source
UGC 7639: A Dwarf Galaxy in the Canes Venatici I Cloud
Advances in Astronomy, Volume 2015, Issue 1, 2015., 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 regions are composed mostly by young stellar populations.
L. M. Buson +4 more
wiley +1 more source
Deep photometry of the Draco dwarf spheroidal galaxy [PDF]
The Astronomical Journal, 1986 We report the results of deep CCD photometry of two overlapping fields in the Draco dwarf spheroidal galaxy. We find (B-V)o,g = m0.69, indicating a mean [Fe/H] = −2.0. The width of the giant branch below the horizontal branch is somewhat wider than our observational errors permit, from which we infer there is a spread in metallicities amongst the Draco
Bruce W. Carney, P. Seitzer
openaire +1 more source
The Tucana dwarf spheroidal galaxy: not such a massive failure after all [PDF]
Astronomy & Astrophysics, 2020 Context. Isolated local group (LG) dwarf galaxies have evolved most or all of their life unaffected by interactions with the large LG spirals and therefore offer the opportunity to learn about the intrinsic characteristics of this class of objects. Aims.
Taibi, S. +7 more
openaire +4 more sources
Chemical and Photometric Evolution Models for Disk, Irregular, and Low Mass Galaxies
Advances in Astronomy, Volume 2014, Issue 1, 2014., 2014 We summarize the updated set of multiphase chemical evolution models performed with 44 theoretical radial mass initial distributions and 10 possible values of efficiencies to form molecular clouds and stars. We present the results about the infall rate histories, the formation of the disk, and the evolution of the radial distributions of diffuse and ...
Mercedes Mollá, Jorge Iglesias Páramo
wiley +1 more source
A Chemical Evolution Model for the Fornax Dwarf Spheroidal Galaxy
EPJ Web of Conferences, 2016 Fornax is the brightest Milky Way (MW) dwarf spheroidal galaxy and its star formation history (SFH) has been derived from observations. We estimate the time evolution of its gas mass and net inflow and outflow rates from the SFH usinga simple star ...
Yuan Zhen, Qian Yong-Zhong, Jing Yi Peng
doaj +1 more source
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.
Ambartsumian V. A. +10 more
core +2 more sources
THE CHEMICAL EVOLUTION OF THE DRACO DWARF SPHEROIDAL GALAXY [PDF]
The Astrophysical Journal, 2009 We present an abundance analysis based on high resolution spectra of 8 stars selected to span the full range in metallicity in the Draco dwarf spheroidal galaxy. We find [Fe/H] for the sample stars ranges from -1.5 to -3.0 dex. Combining our sample with previously published work for a total of 14 luminous Draco giants, we show that the abundance ratios
Cohen, Judith G., Huang, Wenjin
openaire +3 more sources