Results 121 to 130 of about 480,960 (375)

DDO 68-C: HST Confirms Yet Another Companion of the Isolated Dwarf Galaxy DDO 68

The Astrophysical Journal
We present the results of deep Hubble Space Telescope photometry of the dwarf galaxy DDO 68-C, proposed as possibly associated with the isolated peculiar dwarf DDO 68.
Matteo Correnti, Francesca Annibali, Michele Bellazzini, Mariarosa Marinelli, Alessandra Aloisi, Michele Cignoni, Monica Tosi, Raffaele Pascale, John M. Cannon, Lila Schisgal, Leslie K. Hunt, Elena Sacchi, Sangmo Tony Sohn   +12 more
doaj   +1 more source

Adsorption of Helium on Cationic or Anionic Tetracene and Pentacene

Small Structures, EarlyView.
How does the arrangement of helium atoms that are adsorbed on tetracene or pentacene ions change with increasing coverage? When does the adsorption layer change from 1D to 2D, and to 3D? Is the transition abrupt? Are the helium atoms localized? Is the arrangement the same for cations and anions? What changes as the acene grows in length?
Miriam Kappe, Florent Calvo, Rasif William, Bilal Rasul, Masoomeh Mahmoodi‐Darian, Paul Scheier, Olof Echt   +6 more
wiley   +1 more source

When is a Bulge Not a Bulge? Revealing the Satellite Nature of NGC 5474’s Bulge

The Astrophysical Journal
A satellite galaxy of the nearby spiral M101, NGC 5474 has a prominent bulge offset from the kinematic center of the underlying star-forming disk that has gained attention in recent years.
Ray Garner III, J. Christopher Mihos, F. Fabián Rosales-Ortega   +2 more
doaj   +1 more source

KLUN+ peculiar velocity survey

, 2003
The enhanced Kinematics of the Local Universe (KLUN+) galaxy sample is a collection of galaxies suitable for Tully-Fisher (TF) or Faber-Jackson (FJ) distance estimation.
Hanski, M O
core   +1 more source

Saving Bambi from the mower? Using a drone with thermal camera to evaluate a low‐tech scaring technique to reduce roe deer fawn mortality during grass harvest

Wildlife Biology, EarlyView.
Roe deer is a species that hides their neonates as an anti‐predator strategy. This may prove efficient against mammalian predators, such as the red fox; however, it might be an ecological trap as large numbers of fawns are killed by tractors with harvesters each year during grass harvest.
Thomas Vogler, Neri H Thorsen, Simen Pedersen   +2 more
wiley   +1 more source

The role of peculiar velocity uncertainties in standard siren cosmology

The Open Journal of Astrophysics
Local distance indicators such as standard sirens, in combination with spectroscopic redshift measurements of their host galaxies, allow us to estimate the present-day expansion rate of the Universe parameterised by Hubble's constant, H_0. However, these
Chris Blake, Ryan J. Turner
doaj   +1 more source

The peculiar velocities of rich clusters in the hot and cold dark matter scenarios [PDF]

We present the results of a study of the peculiar velocities of rich clusters of galaxies. The peculiar motion of rich clusters in various cosmological scenarios is of interest for a number of reasons. Observationally, one can measure the peculiar motion
Rhee, George F., Villumsen, Jens V., West, Michael J.   +2 more
core   +1 more source

Confrontation of a Double Inflationary Cosmological Model with Observations

, 1993
CDM models with non-scale-free step-like spectra of adiabatic perturbations produced in a realistic double inflationary model are compared with recent observational data.
Gottloeber, Stefan, Muecket, Jan P., Starobinsky, A.   +2 more
core   +1 more source

The Peculiar Motions of Early‐Type Galaxies in Two Distant Regions. IV. The Photometric Fitting Procedure [PDF]

, 1997
R. P. Saglia, Edmund Bertschinger, G. Baggley, David Burstein, Matthew Colless, Roger L. Davies, Robert K. McMahan, G. Wegner   +7 more
openalex   +1 more source

Radiation‐Induced Degradation in Polymeric Materials: Alterations in Physical–Chemical Properties and Their Effects on Electrical Performance of Insulation Systems

High Voltage, EarlyView.
ABSTRACT This paper investigates the effects of radiation on polymeric materials used as insulation systems in electrical equipment such as cables for nuclear and particle accelerator applications. After a detailed description of the physics of radiation‐induced damage in the polymeric matrix, a comprehensive analysis of the physical–chemical and ...
Simone Vincenzo Suraci, Davide Fabiani
wiley   +1 more source