Results 41 to 50 of about 2,413,471 (156)
Observed Properties of Dark Matter on Small Spatial Scales [PDF]
, 2007 The nature of dark matter is one of the outstanding questions of astrophysics. The internal motions of member stars reveal that the lowest luminosity galaxies in the Local Group are the most dark-matter dominated.
Benson +4 more
core +1 more source
Astronomische Nachrichten, EarlyView.ABSTRACT The discovery of radio‐quiet, x‐ray thermally emitting isolated neutron stars (XINSs) in the ROSAT All‐Sky Survey revealed a previously overlooked component of the neutron star population. Advancements in x‐ray instrumentation and the availability of deep, wide‐area optical surveys now enable us to explore XINSs at fainter x‐ray fluxes and ...
Adriana Mancini Pires +11 more
wiley +1 more source
Comment about the Letter entitled ``Scalar fields as dark matter in spiral galaxies" [PDF]
Class.Quant.Grav.18:2851,2001, 2000 In this comment we point out some problems with the approach used in the paper "Scalar fields as dark matter in spiral galaxies" in the attempt to explain the flatness of the rotation curves of galaxies.
arxiv +1 more source
Astrophysics on the GRAPE Family of Special Purpose Computers [PDF]
, 1998 The GRAPE-4, the world's fastest computer in 1995-1997, has produced some major scientific results, through a wide diversity of large-scale simulations in astrophysics.
Hut, Piet, Makino, Jun
core +3 more sources
Exploring Dark Photon Production and Kinetic Mixing Constraints in Heavy‐Ion Collisions
Astronomische Nachrichten, EarlyView.ABSTRACT Vector U‐bosons, often referred to as “dark photons,” are potential candidates for mediating dark matter interactions. In this study, we outline a procedure to derive theoretical constraints on the upper bound of the kinetic mixing parameter ϵ2MU$$ {\upvarepsilon}^2\left({M}_U\right) $$ using dilepton data from heavy‐ion from SIS to RHIC ...
Adrian William Romero Jorge +3 more
wiley +1 more source
The black hole mass of BL Lacs from stellar velocity dispersion of the host galaxy [PDF]
, 2001 We present the first results from our on-going program to estimate black hole masses [M(BH)] of nearby BL Lac objects. The estimates are based on stellar velocity dispersion (sigma) of the BL Lac host galaxies from optical spectroscopy, and the recently ...
Falomo, Renato +2 more
core +3 more sources
A case for radio galaxies as the sources of IceCube's astrophysical neutrino flux [PDF]
Journal of Cosmology and Astroparticle Physics, 2016 15 pages, 4 ...
Dan Hooper, Dan Hooper
openaire +4 more sources
Review of asteroid, meteor, and meteorite‐type links
Meteoritics &Planetary Science, EarlyView.Abstract With the goal to determine the origin of our meteorites in the asteroid belt, video and photographic observations of meteors have now tracked 75 meteorite falls. Six years ago, there were just hints that different meteorite types arrived on different orbits, but now, the number of orbits (N) is high enough for distinct patterns to emerge.
Peter Jenniskens +1 more
wiley +1 more source
Compact jets as probes for sub-parsec scale regions in AGN
, 2007 Compact relativistic jets in active galactic nuclei offer an effective tool for investigating the physics of nuclear regions in galaxies. The emission properties, dynamics, and evolution of jets in AGN are closely connected to the characteristics of the ...
A. Celotti +49 more
core +1 more source
High Energy Neutrino Emission from Astrophysical Jets in the Galaxy [PDF]
Advances in High Energy Physics, 2015 We address simulated neutrino emission originated from astrophysical jets of compact objects within the Galaxy. These neutrinos are of high energies (Eνof the order up to a few TeV) and for their observation specialized instruments are in operation, both on Earth and in orbit.
Smponias, T., Kosmas, O.T.
openaire +2 more sources