Search Publications
Re-flaring of a Post-flare Loop System Driven by Flux Rope Emergence and Twisting
Cheng, X.; Ding, M. D.; Zhang, J. +3 more
In this Letter, we study in detail the evolution of the post-flare loops on 2005 January 15 that occurred between two consecutive solar eruption events, both of which generated a fast halo coronal mass ejection (CME) and a major flare. The post-flare loop system, formed after the first CME/flare eruption, evolved rapidly, as manifested by the unus…
The Complex Structure of the Multi-phase Galactic Wind in a Starburst Merger
Shih, Hsin-Yi; Rupke, David S. N.
Neutral outflows have been detected in many ultraluminous infrared galaxies (ULIRGs) via the Na I D λλ5890, 5896 absorption-line doublet. For the first time, we have mapped and analyzed the two-dimensional kinematics of a cool neutral outflow in a ULIRG, F10565+2448, using the integral field unit on Gemini North to observe the Na I D feature. At t…
Is the solar convection zone in strict thermal wind balance?
Antia, H. M.; Brun, A. S.; Chitre, S. M.
Context. The solar rotation profile is conical rather than cylindrical as it could be expected from classical rotating fluid dynamics (e.g. Taylor-Proudman theorem). Thermal coupling to the tachocline, baroclinic effects and latitudinal transport of heat have been suggested to explain this peculiar state of rotation.
Aims: To test the validit…
A relativistically broadened OVIII Lyα line in the ultracompact X-ray binary 4U 0614+091
de Plaa, J.; Fabian, A. C.; Pinto, C. +3 more
Ultracompact X-ray binaries consist of a neutron star or black hole that accretes material from a white dwarf donor star. The ultracompact nature is expressed in very short orbital periods of less than 1 h. In the case of 4U 0614+091 oxygen-rich material from a CO or ONe white dwarf is flowing to the neutron star. This oxygen-rich disc can reflect…
Herschel observations of EXtra-Ordinary Sources (HEXOS): The Terahertz spectrum of Orion KL seen at high spectral resolution
Menten, K. M.; Falgarone, E.; Martin, P. G. +60 more
We present the first high spectral resolution observations of Orion KL in the frequency ranges 1573.4-1702.8 GHz (band 6b) and 1788.4-1906.8 GHz (band 7b) obtained using the HIFI instrument on board the Herschel Space Observatory. We characterize the main emission lines found in the spectrum, which primarily arise from a range of components associ…
Excitation and abundance of C3 in star forming cores. Herschel/HIFI observations of the sight-lines to W31C and W49N
Menten, K. M.; Perault, M.; Boulanger, F. +48 more
We present spectrally resolved observations of triatomic carbon (C3) in several ro-vibrational transitions between the vibrational ground state and the low-energy ν2 bending mode at frequencies between 1654-1897 GHz along the sight-lines to the submillimeter continuum sources W31C and W49N, using Herschel's HIFI instrument. W…
Adaptive Optics Observations of B0128+437: A Low-mass, High-redshift Gravitational Lens
Lagattuta, David J.; Fassnacht, Christopher D.; Auger, Matthew W.
We use high-resolution adaptive optics (AO) imaging on the Keck II telescope to study the gravitational lens B0128+437 in unprecedented detail, allowing us to resolve individual lensed quasar components and, for the first time, detect and measure properties of the lensing galaxy. B0128+437 is a small-separation lens with known flux-ratio and astro…
A Tentative Identification of HCN Ice on Triton
Nakamura, R.; Burgdorf, M.; Cruikshank, D. P. +5 more
Spectra of Triton between 1.8 and 5.5 µm, obtained in 2007 May and 2009 November, have been analyzed to determine the global surface composition. The spectra were acquired with the grism and the prism of the Infrared Camera on board AKARI with spectral resolutions of 135 and 22, respectively. The data from 4 to 5 µm are shown in this L…
Saturn's periodic magnetic field perturbations caused by a rotating partial ring current
Khurana, K. K.; Krimigis, S. M.; Mitchell, D. G. +7 more
We demonstrate that the periodic magnetic field perturbations as observed from Cassini are caused by the plasma pressure of the energetic (>2 keV) particle distributions that are periodically injected and subsequently drift around Saturn. Plasma pressures inferred from the Cassini Plasma Spectrometer (CAPS) (<2 keV) and the Magnetospheric Im…
A new topographic image atlas of Phobos
Oberst, J.; Scholten, F.; Matz, K. -D. +6 more
Phobos flyby images obtained by the High Resolution Stereo Camera (HRSC) and the Super Resolution Channel (SRC) onboard the Mars Express spacecraft were used to produce a global Digital Terrain Model and orthoimage mosaics. We derived a set of Phobos topographic image maps, which are combined into an atlas that consists of four quadrangles on thre…