Results 71 to 80 of about 34,781 (306)

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

Tidal disruption of dwarf spheroidal galaxies: the strange case of Crater II [PDF]

, 2018
Dwarf spheroidal galaxies of the Local Group obey a relationship between the line-of-sight velocity dispersion and half-light radius, although there are a number of dwarfs that lie beneath this relation with suppressed velocity dispersion.
J. Sanders, N. Evans, W. Dehnen
semanticscholar   +1 more source

The chemical evolution of the dwarf spheroidal galaxy Sextans [PDF]

Astronomy & Astrophysics, 2020
We present our analysis of the FLAMES dataset targeting the central 25′ region of the Sextans dwarf spheroidal galaxy (dSph). This dataset is the third major part of the high-resolution spectroscopic section of the ESO large program 171.B-0588(A) obtained by the Dwarf galaxy Abundances and Radial-velocities Team.
Theler, R., Jablonka, P., Lucchesi, R., Lardo, C., North, P., Irwin, M., Battaglia, G., Hill, Vanessa, Tolstoy, E., Venn, K., Helmi, A., Kaufer, A., Primas, Francesca, Shetrone, M.   +13 more
openaire   +6 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, E. Moya de Guerra, M. Ramón Medrano, Theocharis Kosmas   +3 more
wiley   +1 more source

THE MODELLING OF THE MASS-METALLICITY RELATION FOR THE LOCAL GROUP DWARF GALAXIES

Odessa Astronomical Publications, 2008
We present results of modelling of the mass-metallicity relation for the Local Group dwarf spheroidal (dSph) galaxies. In this work, we use a single-zone chemo-dynamical model. Our model is based on the scheme suggested by C. Firmani and A. Tutukov (1992)
M. V. Ryabova, Yu. A. Shchekinov
doaj   +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, D. Bettoni, P. Mazzei, G. Galletta, Duncan Forbes   +4 more
wiley   +1 more source

Extreme Tidal Stripping May Explain the Overmassive Black Hole in Leo I: A Proof of Concept

The Astrophysical Journal Letters, 2023
A recent study found dynamical evidence of a supermassive black hole of ∼3 × 10 ^6 M _⊙ at the center of Leo I, the most distant dwarf spheroidal galaxy of the Milky Way. This black hole, comparable in mass to the Milky Way’s Sgr A*, places the system >2
Fabio Pacucci, Yueying Ni, Abraham Loeb
doaj   +1 more source

A MegaCam Survey of Outer Halo Satellites. VII. A Single S\'ersic Index v/s Effective Radius Relation for Milky Way Outer Halo Satellites

, 2019
In this work we use structural properties of Milky Way's outer halo ($R_G > 25\,\mathrm{kpc}$) satellites (dwarf spheroidal galaxies, ultra-faint dwarf galaxies and globular clusters) derived from deep, wide-field and homogeneous data, to present ...
Carballo-Bello, Julio A., Chanamé, Julio, Djorgovski, S. G., Geha, Marla, Marchi-Lasch, Sebastián, Muñoz, Ricardo R., Santana, Felipe A., Simon, Joshua D., Stetson, Peter B.   +8 more
core   +1 more source

Model-independent constraints on dark matter annihilation in dwarf spheroidal galaxies [PDF]

, 2018
We present a general, model-independent formalism for determining bounds on the production of photons in dwarf spheroidal galaxies via dark matter annihilation, applicable to any set of assumptions about dark matter particle physics or astrophysics.
K. Boddy, J. Kumar, D. Marfatia, Pearl Sandick   +3 more
semanticscholar   +1 more source

The impact of cored density profiles on the observable quantities of dwarf spheroidal galaxies [PDF]

Monthly Notices of the Royal Astronomical Society: Letters, 2018
We modify the chemo-dynamical code gear to simulate the impact of self-interacting dark matter (SIDM) on the observable quantities of 19 low-mass dwarf galaxies with a variety star-forming properties.
D. Harvey, Y. Revaz, A. Robertson, L. Hausammann   +3 more
semanticscholar   +1 more source