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Characteristic size and shape of the mirror mode structures in the solar wind at 0.72 AU
Russell, C. T.; Zhang, T. L.; Glassmeier, K. -H. +10 more
We investigate the structure of mirror modes in the solar wind at 0.72 AU using Venus Express magnetic field measurements. The mirror mode structure is identified as the presence of magnetic depression or magnetic ``holes'' in the solar wind with little or no directional change across them. We determine the characteristic size and shape of these s…
Tropical mountain glaciers on Mars: Altitude-dependence of ice accumulation, accumulation conditions, formation times, glacier dynamics, and implications for planetary spin-axis/orbital history
Head, James W.; Forget, Francois; Fastook, James L. +1 more
Fan-shaped deposits up to ∼166,000 km in area are found on the northwest flanks of the huge Tharsis Montes volcanoes in the tropics of Mars. Recent spacecraft data have confirmed earlier hypotheses that these lobate deposits are glacial in origin. Increased knowledge of polar-latitude terrestrial glacial analogs in the Antarctic Dry Valleys has be…
A comparison of coronal mass ejections identified by manual and automatic methods
Gopalswamy, N.; Michalek, G.; Yashiro, S.
Coronal mass ejections (CMEs) are related to many phenomena (e.g. flares, solar energetic particles, geomagnetic storms), thus compiling of event catalogs is important for a global understanding these phenomena. CMEs have been identified manually for a long time, but in the SOHO era, automatic identification methods are being developed. In order t…
The shape of the dark matter halo in the early-type galaxy NGC 2974
Krajnović, Davor; van de Ven, Glenn; Morganti, Raffaella +3 more
We present HI observations of the elliptical galaxy NGC 2974, obtained with the Very Large Array. These observations reveal that the previously detected HI disc in this galaxy is in fact a ring. By studying the harmonic expansion of the velocity field along the ring, we constrain the elongation of the halo and find that the underlying gravitationa…
First Imaging of Coronal Mass Ejections in the Heliosphere Viewed from Outside the Sun Earth Line
Howard, Russell A.; Bewsher, Danielle; Davis, Christopher J. +13 more
We show for the first time images of solar coronal mass ejections (CMEs) viewed using the Heliospheric Imager (HI) instrument aboard the NASA STEREO spacecraft. The HI instruments are wide-angle imaging systems designed to detect CMEs in the heliosphere, in particular, for the first time, observing the propagation of such events along the Sun - Ea…
Systematic Infrared 2.5-5 µm Spectroscopy of Nearby Ultraluminous Infrared Galaxies with AKARI
Nakagawa, Takao; Shirahata, Mai; Imanishi, Masatoshi +4 more
We report on the results of systematic infrared 2.5-5 µm spectroscopy of 45 nearby ultraluminous infrared galaxies (ULIRGs) at z < 0.3 using AKARI IRC. This paper investigates whether the luminosities of these ULIRGs are dominated by starburst activity, or alternatively, whether optically elusive buried active galactic nuclei (AGNs) are e…
Disks around CQ Tauri and MWC 758: dense PDR or gas dispersal?
Chapillon, E.; Guilloteau, S.; Dutrey, A. +1 more
Context: The overall properties of disks surrounding intermediate PMS stars (HAe) are not yet well constrained by current observations. The disk inclination, which significantly affects spectral energy distribution modeling, is often unknown.
Aims: We attempted to resolve the disks around CQ Tau and MWC 758 to provide accurate constraints on t…
Determining Titan's Spin State from Cassini RADAR Images
Iess, Luciano; Cassini RADAR Team; Stiles, Bryan W. +12 more
For some 19 areas of Titan's surface, the Cassini RADAR instrument has obtained synthetic aperture radar (SAR) images during two different flybys. The time interval between flybys varies from several weeks to two years. We have used the apparent misregistration (by 10-30 km) of features between separate flybys to construct a refined model of Titan…
The Extended HST Supernova Survey: The Rate of SNe Ia at z > 1.4 Remains Low
Riess, Adam G.; Strolger, Louis-Gregory; Dahlen, Tomas
We use the HST ACS imaging of the two GOODS fields during Cycles 11, 12, and 13 to derive the Type Ia supernova rate in four redshift intervals in the range 0.2 < z < 1.8. Compared to our previous results based on Cycle 11 observations only, we have increased the coverage of the search by a factor 2.7, making the total area searched equivale…
The Host Galaxy and Central Engine of the Dwarf Active Galactic Nucleus POX 52
Ho, Luis C.; Thornton, Carol E.; Barth, Aaron J. +2 more
We present new multiwavelength observations of the dwarf Seyfert 1 galaxy POX 52 in order to investigate the properties of the host galaxy and the active nucleus and to examine the mass of its black hole, previously estimated to be ~105 M⊙. HST ACS HRC images show that the host galaxy has a dwarf elliptical morphology (M…