Results 11 to 20 of about 11,545 (216)

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, Hilary Kennedy, Benjamin M. Butler, Sarah J. Day, Emmal Safi, Aneurin Evans   +5 more
wiley   +1 more source

1I/‘Oumuamua as an N2 Ice Fragment of an Exo‐Pluto Surface II: Generation of N2 Ice Fragments and the Origin of ‘Oumuamua

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

Manganese in dwarf spheroidal galaxies [PDF]

Astronomy & Astrophysics, 2012
19 pages, 10 figures, accepted for publication in Astronomy & ...
North, P., Cescutti, G., Jablonka, P., Hill, V., Shetrone, M., Letarte, B., Lemasle, B., Venn, K.A., Battaglia, G., Tolstoy, E., Irwin, M.J., Primas, Francesca, François, P.   +12 more
openaire   +6 more sources

Mass Modelling of dwarf Spheroidal Galaxies [PDF]

Proceedings of the International Astronomical Union, 2007
AbstractWe study the origin and properties of unbound stars in the kinematic samples of dwarf spheroidal galaxies. For this purpose we have run a high resolution N-body simulation of a two-component dwarf galaxy orbiting in a Milky Way potential. We create mock kinematic data sets by observing the dwarf in different directions.
Klimentowski, J, Łokas, E L, Kazantzidis, S, Prada, F, Mayer, L, Mamon, G A   +5 more
openaire   +2 more sources

Dwarf Spheroidal Galaxies in the Virgo Cluster [PDF]

The Astrophysical Journal, 1998
We present a study of the smallest and faintest galaxies found in a very deep photographic R band survey of regions of the Virgo Cluster, totalling over 3 square degrees, made with the UK Schmidt Telescope. The objects we detect have the same physical sizes and surface brightnesses as Local Group dwarf spheroidal galaxies.
Jones, JB, Phillipps, S, Schwartzenberg, JM, Parker, QA   +3 more
openaire   +4 more sources

The quest for dark matter in dwarf spheroidal galaxies with the Cherenkov Telescope Array [PDF]

EPJ Web of Conferences, 2019
Dwarf spheroidal galaxies are among the best environments that can be studied with Cherenkov telescopes for indirect searches of γ-ray signals coming from dark matter self-interaction (annihilation or decay), due to their proximity and negligible ...
Saturni Francesco G., Rodríguez-Fernández Gonzalo, Morselli Aldo   +2 more
doaj   +1 more source

Kinematic subpopulations in dwarf spheroidal galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2010
Submitted to ...
Ural, Uğur, Wilkinson, Mark I., Koch, Andreas, Gilmore, Gerard, Beers, Timothy C., Belokurov, V., Wyn Evans, N., Grebel, E.K., Vidrih, Simon, Zucker, D. B.   +9 more
openaire   +3 more sources

The Andromeda Dwarf Spheroidal Galaxies [PDF]

Symposium - International Astronomical Union, 1999
Our current knowledge of M31's dwarf spheroidal companions is reviewed. Two topics of recent interest constitute the bulk of this review. First, color-magnitude diagrams reaching below the horizontal branch have been constructed for two M31 dwarf spheroidals, based on images from HST/WFPC2. The horizontal branches are predominantly red in both galaxies,
Armandroff, Taft E., Da Costa, Gary S.
openaire   +2 more sources

The usage of Stromgren photometry in studies of Local Group Dwarf Spheroidal Galaxies - Application to Draco: a new catalogue of Draco members and a study of the metallicity distribution function and radial gradients [PDF]

, 2006
In this paper we demonstrate how Stromgren uvby photometry can be efficiently used to: 1. Identify red giant branch stars that are members in a dwarf spheroidal galaxy. 2.
A. Ardeberg, Anthony-Twarog, Aparicio, Armandroff, Ashman, Baade, Bell, Bell, Bellazzini, Bergbusch, Bonanos, Bond, Cardelli, Carney, Carretta, Cioni, Clem, Crawford, Crawford, D. Faria, Dolphin, Fulbright, G. Gilmore, G. M. Wahlgren, Grebel, Grillmair, Grundahl, Gustafsson, Harbeck, Hartwick, Heiter, Hilker, Hodge, I. Lundström, Irwin, Irwin, Kleyna, Koch, Lehnert, Muñoz, Odenkirchen, Olsen, Olsen, Olsen, Olsen, Olszewski, P. Linde, S. Feltzing, Schlegel, Schuster, Schuster, Shapley, Shetrone, Shetrone, Smith, Stetson, Stetson, Stetson, Wilkinson, Zinn, Zinn, Zinn, Zinn   +62 more
core   +2 more sources