Search Publications
Missions
Journals
Publication Years
A comparative analysis of the observed white dwarf cooling sequence from globular clusters
Kepler, S. O.; Costa, J. E. S.; Montgomery, M. H. +8 more
We report our study of features at the observed red end of the white dwarf cooling sequences for three Galactic globular clusters: NGC 6397, 47 Tucanae and M 4. We use deep colour-magnitude diagrams constructed from archival Hubble Space Telescope (Advanced Camera for Surveys) to systematically investigate the blue turn at faint magnitudes and the…
Active Longitude and Solar Flare Occurrences
Ludmány, A.; Baranyi, T.; Gyenge, N.
The aim of the present work is to specify the spatio-temporal characteristics of flare activity observed by the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) and the Geostationary Operational Environmental Satellite (GOES) in connection with the behavior of the longitudinal domain of enhanced sunspot activity known as active longit…
The Effects of Kinetic Instabilities on Small-scale Turbulence in Earth’s Magnetosheath
Vaivads, A.; Alexandrova, O.; Breuillard, H. +1 more
The Earth's magnetosheath is the region delimited by the bow shock and the magnetopause. It is characterized by highly turbulent fluctuations covering all scales from MHD down to kinetic scales. Turbulence is thought to play a fundamental role in key processes such as energy transport and dissipation in plasma. In addition to turbulence, different…
Down-the-barrel and Transverse Observations of the Large Magellanic Cloud: Evidence for a Symmetric Galactic Wind on the Near and Far Sides of the Galaxy
Lehner, N.; Howk, J. C.; Barger, K. A.
We compare the properties of gas flows on both the near and far side of the Large Magellanic Cloud (LMC) disk using Hubble Space Telescope UV absorption-line observations toward an active galactic nucleus behind (transverse) and a star within (down-the-barrel) the LMC disk at an impact parameter of 3.2 {kpc}. We find that even in this relatively q…
KAT-7 observations of an unbiased sample of mass-selected galaxy clusters
Brunetti, G.; Venturi, T.; Dallacasa, D. +7 more
The presence of megaparsec-scale radio haloes in galaxy clusters has already been established by many observations over the last two decades. The emerging explanation for the formation of these giant sources of diffuse synchrotron radio emission is that they trace turbulent regions in the intracluster medium, where particles are trapped and accele…
Long-Duration Gamma-Ray Burst Host Galaxies in Emission and Absorption
Fynbo, Johan P. U.; Perley, Daniel A.; Tanvir, Nial R. +2 more
The galaxy population hosting long-duration GRBs provides a means to constrain the progenitor and an opportunity to use these violent explosions to characterize the nature of the high-redshift universe. Studies of GRB host galaxies in emission reveal a population of star-forming galaxies with great diversity, spanning a wide range of masses, metal…
Unexpected spatial intensity distributions and onset timing of solar electron events observed by closely spaced STEREO spacecraft
Gómez-Herrero, R.; Dresing, N.; Heber, B. +2 more
We present multi-spacecraft observations of four solar electron events using measurements from the Solar Electron Proton Telescope (SEPT) and the Electron Proton Helium INstrument (EPHIN) on board the STEREO and SOHO spacecraft, respectively, occurring between 11 October 2013 and 1 August 2014, during the approaching superior conjunction period of…
HERUS: A CO Atlas from SPIRE Spectroscopy of Local ULIRGs
Lebouteiller, Vianney; Cormier, Diane; Pearson, Chris +10 more
We present the Herschel SPIRE Fourier Transform Spectroscopy (FTS) atlas for a complete flux-limited sample of local ultraluminous infrared galaxies (ULIRGs) as part of the HERschel Ultra Luminous InfraRed Galaxy Survey (HERUS). The data reduction is described in detail and was optimized for faint FTS sources ,with particular care being taken for …
Planck constraints on scalar-tensor cosmology and the variation of the gravitational constant
Ichiki, Kiyotomo; Sugiyama, Naoshi; Ooba, Junpei +1 more
Cosmological constraints on the scalar-tensor theory of gravity by analyzing the angular power spectrum data of the cosmic microwave background (CMB) obtained from the Planck 2015 results are presented. We consider the harmonic attractor model, in which the scalar field has a harmonic potential with curvature (β ) in the Einstein frame and the the…
Deep Morphological and Spectral Study of the SNR RCW 86 with Fermi-LAT
Troja, E.; Orlando, E.; Hill, A. B. +107 more
RCW 86 is a young supernova remnant (SNR) showing a shell-type structure at several wavelengths and is thought to be an efficient cosmic-ray (CR) accelerator. Earlier Fermi Large Area Telescope results reported the detection of γ-ray emission coincident with the position of RCW 86 but its origin (leptonic or hadronic) remained unclear due to the p…