Search Publications
The Discovery of a Very Faint X-Ray Transient in the Globular Cluster M15
Heinke, Craig O.; Cohn, Haldan N.; Lugger, Phyllis M.
We have identified an X-ray transient (hereafter M15 X-3) in the globular cluster M15 from an archival Chandra grating observation. M15 X-3 appears at an X-ray luminosity of 6 × 1033 erg s-1 with a spectrum consistent with an absorbed power law of photon index 1.51 ± 0.14. The object is identifiable in archival Chandra HRC-I …
A Survey of Coronal Cavity Density Profiles
Gibson, S. E.; Fuller, J.
Coronal cavities are common features of the solar corona that appear as darkened regions at the base of coronal helmet streamers in coronagraph images. Their darkened appearance indicates that they are regions of lowered density embedded within the comparatively higher density helmet streamer. Despite interfering projection effects of the surround…
Spectroscopic orbits for K giants β Reticuli and ν Octantis: what is causing a low-amplitude radial velocity resonant perturbation in ν Oct?
Pourbaix, D.; Ramm, D. J.; Hearnshaw, J. B. +1 more
New astrometric-spectroscopic orbital solutions for the single-line K-giant binaries β Reticuli (P ~ 5.2yr, e = 0.3346 +/- 0.0004) and ν Octantis (P ~ 2.9yr, e = 0.2358 +/- 0.0003) have been derived based on high-precision spectroscopic radial velocities (RVs) and the Hipparcos astrometry. For the case of ν Oct, the simultaneous solution is partic…
Is the Black Hole in GX 339-4 Really Spinning Rapidly?
Takahashi, H.; Gandhi, P.; Yamada, S. +7 more
The wide-band Suzaku spectra of the black hole (BH) binary GX 339-4, acquired in 2007 February during the Very High state, were reanalyzed. Effects of event pileup (significant within ~3' of the image center) and telemetry saturation of the X-ray Imaging Spectrometer (XIS) data were carefully considered. The source was detected up to ~300 keV, wit…
Cluster observations of the entry layer equatorward of the cusp under northward interplanetary magnetic field
Zhang, H.; Zong, Q. -G.; Lucek, E. +11 more
Various boundary crossings in the vicinity of the high-altitude cusp region were experienced by the Cluster spacecraft when the interplanetary magnetic field (IMF) was northward. In contrast to the southward IMF cases, in which a turbulent and diffusive entry layer is present equatorward of the cusp, a transition layer (without significant turbule…
A study of the properties of a local dust storm with Mars Express OMEGA and PFS data
Bibring, J. -P.; Gondet, B.; Langevin, Y. +8 more
We present observations of a local dust storm performed by the OMEGA and PFS instruments aboard Mars Express. OMEGA observations are used to retrieve the dust single-scattering albedo in the spectral range 0.4-4.0 µm. The single-scattering albedo shows fairly constant values between 0.6 and 2.6 µm, and a sharp decrease at wavelengths s…
An OSIRIS Study of the Gas Kinematics in a Sample of UV-Selected Galaxies: Evidence of "Hot and Bothered" Starbursts in the Local Universe
Law, David R.; Overzier, Roderik; Schiminovich, David +6 more
We present data from Integral Field Spectroscopy for three supercompact UV-Luminous Galaxies (ScUVLGs). As nearby (z ~ 0.2) compact (R 50 ~ 1-2 kpc) bright Paschen-α sources, with unusually high star formation rates (SFR = 3-100 M sun yr-1), ScUVLGs are an ideal population for studying detailed kinematics and dynam…
Wave turbulence in magnetized plasmas
Galtier, S.
The paper reviews the recent progress on wave turbulence for magnetized plasmas (MHD, Hall MHD and electron MHD) in the incompressible and compressible cases. The emphasis is made on homogeneous and anisotropic turbulence which usually provides the best theoretical framework to investigate space and laboratory plasmas. The solar wind and the coron…
Revealing the sub-AU asymmetries of the inner dust rim in the disk around the Herbig Ae star R Coronae Austrinae
Weigelt, G.; Hofmann, K. -H.; Meilland, A. +5 more
Context: Unveiling the structure of the disks around intermediate-mass pre-main-sequence stars (Herbig Ae/Be stars) is essential for our understanding of the star and planet formation process. In particular, models predict that in the innermost AU around the star, the dust disk forms a “puffed-up” inner rim, which should result in a strongly asymm…
Dynamics of Saturn's Dense Rings
Schmidt, Jürgen; Ohtsuki, Keiji; Rappaport, Nicole +2 more
The Cassini mission to Saturn opened a new era in the research of planetary rings, bringing data in unprecedented detail, monitoring the structure and properties of Saturn's ring system. The question of ring dynamics is to identify and understand underlying physical processes and to connect them to the observations in terms of mathematical models …