Results 81 to 90 of about 12,545 (267)

Updated Bounds on Axion‐Like Particle Dark Matter with the Optical MUSE‐Faint Survey

Annalen der Physik, Volume 536, Issue 1, January 2024.
This study presents bounds on the axion‐like particle (ALP) to two‐photon coupling in the mass range $2.65‐5.27$ eV. The signal from ALP decay are sought in the Multi Unit Spectroscopic Explorer (MUSE) observations of five dwarf spheroidal galaxies, under the assumption that ALPs make up the whole dark matter.
Elisa Todarello
wiley   +1 more source

Pulsar‐Driven Jets in Supernovae, Gamma‐Ray Bursts, and the Universe

Advances in Astronomy, Volume 2012, Issue 1, 2012., 2012
The bipolarity of Supernova 1987A can be understood through its very early light curve from the CTIO 0.4 m telescope and IUE FES and following speckle observations of the “Mystery Spot”. These indicate a beam/jet of light/particles, with initial collimation factors >104 and velocities >0.95 c, involving up to 10−5 M⊙ interacting with circumstellar ...
John Middleditch, Alberto J. Castro-Tirado   +1 more
wiley   +1 more source

On the Hunt for the Origins of the Orphan–Chenab Stream: Detailed Element Abundances with APOGEE and Gaia

The Astrophysical Journal, 2023
Stellar streams in the Galactic halo are useful probes of the assembly of galaxies like the Milky Way. Many tidal stellar streams that have been found in recent years are accompanied by a known progenitor globular cluster or dwarf galaxy.
Keith Hawkins, Adrian M. Price-Whelan, Allyson A. Sheffield, Aidan Z. Subrahimovic, Rachael L. Beaton, Vasily Belokurov, Denis Erkal, Sergey E. Koposov, Richard R. Lane, Chervin F. P. Laporte, Christian Nitschelm   +10 more
doaj   +1 more source

The effect of tides on the Sculptor dwarf spheroidal galaxy [PDF]

Monthly Notices of the Royal Astronomical Society, 2019
AbstractDwarf spheroidal galaxies (dSphs) appear to be some of the most dark matter (DM)-dominated objects in the Universe. Their dynamical masses are commonly derived using the kinematics of stars under the assumption of equilibrium. However, these objects are satellites of massive galaxies (e.g.
Carlo Nipoti, Giuseppina Battaglia, Giuseppina Battaglia, G. Iorio, Antonio Sollima   +4 more
openaire   +6 more sources

Implications and Applications of Kinematic Galaxy Scaling Relations

International Scholarly Research Notices, Volume 2012, Issue 1, 2012., 2012
Galaxy scaling relations, which describe a connection between ostensibly unrelated physical characteristics, testify to an underlying order in galaxy formation that requires understanding. I review the development of a scaling relation that (1) unites the well‐known fundamental plane (FP) relation of giant elliptical galaxies and Tully‐Fisher (TF ...
Dennis Zaritsky, J. A. L. Aguerri, P. Salucci   +2 more
wiley   +1 more source

An Analytical Galactic Chemical Evolution Model with Gas Inflow and a Terminal Wind

The Astrophysical Journal
We present a new analytical galactic chemical evolution (GCE) model with gas inflow, internally caused outflow, and extra gas loss after a period of time. The latter mimics the ram pressure stripping of a dwarf satellite galaxy near the pericenter of its
Kateryna A. Kvasova, Evan N. Kirby
doaj   +1 more source

Maximally self-interacting dark matter: models and predictions

Journal of High Energy Physics, 2020
We study self-interacting dark matter (SIDM) scenarios, where the s-wave self-scattering cross section almost saturates the Unitarity bound. Such self-scattering cross sections are singly parameterized by the dark matter mass, and are featured by strong ...
Ayuki Kamada, Hee Jung Kim, Takumi Kuwahara   +2 more
doaj   +1 more source

On Dwarf Galaxies as the Source of Intracluster Gas [PDF]

, 1996
Recent observational evidence for steep dwarf galaxy luminosity functions in several rich clusters has led to speculation that their precursors may be the source of the majority of gas and metals inferred from intracluster medium (ICM) x-ray observations.
Arimoto N., Arnaud M., B. K. Gibson, Babul A., Bower R. G., Driver S. P., Elbaz D., F. Matteucci, Gibson B. K., Gibson B. K., Gibson B. K., Gibson B. K., Greggio L., Larson R. B., Matteucci F., Matteucci F., Matteucci F., Matteucci F., Melnick J., Mihara K., Mitchell R. J., Okazaki Y., Pastor J., Renzini A., Sarazin C. L., Schaller G., Sil'chenko O. K., Terlevich R., Yoshii Y.   +28 more
core   +3 more sources

THE HOT DARK MATTER MODEL: FURTHER INVESTIGATION

Odessa Astronomical Publications, 2020
e outer region with the dominant hot dark matter (the parabolic orbit of the test particle). It was assumed that the hot dark matter consists of hypothetical Planck neutrinos arising in the decay of the protons at the Planck scale.
D. L. Khokhlov
doaj   +1 more source

Molecular Gas Properties in Young Stellar Clusters with a Suppressed Star Cluster Wind

The Astrophysical Journal Letters, 2023
In compact and dense star-forming clouds a global star cluster wind could be suppressed. In this case stellar feedback is unable to expel the leftover gas from the cluster. Young massive stars remain embedded in a dense residual gas and stir it by moving
Sergiy Silich, Jean Turner, Jonathan Mackey, Sergio Martínez-González   +3 more
doaj   +1 more source