Search Publications
Thermal Pressures in the Interstellar Medium of the Magellanic Clouds
York, Donald G.; Lauroesch, James T.; Welty, Daniel E. +1 more
We discuss the thermal pressures (nHT) in predominantly cold, neutral interstellar gas in the Magellanic Clouds, derived from analyses of the fine-structure excitation of neutral carbon, as seen in high-resolution Hubble Space Telescope/Space Telescope Imaging Spectrograph spectra of seven diverse sight lines in the LMC and SMC. Detaile…
Kiloparsec Mass/Light Offsets in the Galaxy Pair-Lyα Emitter Lens System SDSS J1011+0143
Brownstein, Joel R.; Dey, Arjun; Spinrad, Hyron +5 more
We report the discovery of significant mass/light offsets in the strong gravitational lensing system SDSS J1011+0143. We use the high-resolution Hubble Space Telescope (HST) F555W- and F814W-band imaging and Sloan Digital Sky Survey (SDSS) spectroscopy of this system, which consists of a close galaxy pair with a projected separation of ≈ 4.2 {{kpc…
Isolated magnetic field structures in Mercury's magnetosheath as possible analogues for terrestrial magnetosheath plasmoids and jets
Karlsson, Tomas; Raines, Jim M.; Liljeblad, Elisabet +3 more
We have investigated MESSENGER magnetic field data from the Mercury magnetosheath and near solar wind, to identify isolated magnetic field structures (defined as clear, isolated changes in the field magnitude). Their properties are studied in order to determine if they may be considered as analogues to plasmoids and jets known to exist in Earth's …
The amazing diversity in the hot gas content of an X-ray unbiased massive galaxy clusters sample
Andreon, S.; Moretti, A.; Trinchieri, G. +1 more
We aim to determine the intrinsic variety, at a given mass, of the properties of the intracluster medium in clusters of galaxies. This requires a cluster sample selected independently of the intracluster medium content for which reliable masses and subsequent X-ray data can be obtained. We present one such sample, consisting of 34 galaxy clusters …
Electric fields associated with small-scale magnetic holes in the plasma sheet: Evidence for electron currents
Stawarz, Julia E.; Goodrich, Katherine A.; Ergun, Robert E.
We report observations of magnetic holes (MHs) in the near-Earth (8 RE to 12 RE) plasma sheet that have physical sizes perpendicular to the magnetic field (B) on the order of the ion Larmor radius (ρi) and, more importantly, have current layers less than ρi in thickness. Small-scale MHs can have >90% …
A comment on power-law inflation with a dark radiation component
Di Valentino, Eleonora; Bouchet, François R.
Tram et al. 2016 recently pointed out in [1] that power-law inflation in presence of a dark radiation component may relieve the 3.3 σ tension which exists within standard ΛCDM between the determination of the local value of the Hubble constant by Riess et al. (2016) [2] and the value derived from CMB anisotropy data [3] by the Planck collaboration…
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…