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Multiwavelength observation of a large-scale flux rope eruption above a kinked small filament
Kumar, Pankaj; Cho, Kyung-Suk
We analyzed multiwavelength observations of a western limb flare (C3.9) that occurred in AR NOAA 111465 on 30 April 2012. The high-resolution images recorded by SDO/AIA 304, 1600 Å and Hinode/SOT Hα show the activation of a small filament (rising speed ~40 km s-1) associated with a kink instability and the onset of a C-class flare near …
Landing on small bodies: From the Rosetta Lander to MASCOT and beyond
Ulamec, Stephan; Biele, Jens; Geurts, Koen +9 more
Recent planning for science and exploration missions has emphasized the high interest in the close investigation of small bodies in the Solar System. In particular in-situ observations of asteroids and comets play an important role in this field and will contribute substantially to our understanding of the formation and history of the Solar System…
Charge State Evolution in the Solar Wind. III. Model Comparison with Observations
Lepri, S. T.; Zurbuchen, T. H.; Fisk, L. A. +3 more
We test three theoretical models of the fast solar wind with a set of remote sensing observations and in-situ measurements taken during the minimum of solar cycle 23. First, the model electron density and temperature are compared to SOHO/SUMER spectroscopic measurements. Second, the model electron density, temperature, and wind speed are used to p…
The Snapshot Hubble U-Band Cluster Survey (SHUCS). II. The Star Cluster Population of NGC 2997
Larsen, S.; Bastian, N.; Smith, L. J. +6 more
We study the star cluster population of NGC 2997, a giant spiral galaxy located at 9.5 Mpc and targeted by the Snapshot Hubble U-band Cluster Survey (SHUCS). Combining our U-band imaging from SHUCS with archival BVI imaging from the Hubble Space Telescope, we select a high confidence sample of clusters in the circumnuclear ring and disk through a …
Stardust Interstellar Preliminary Examination X: Impact speeds and directions of interstellar grains on the Stardust dust collector
Postberg, Frank; Altobelli, Nicolas; Trieloff, Mario +65 more
On the basis of an interstellar dust model compatible with Ulysses and Galileo observations, we calculate and predict the trajectories of interstellar dust (ISD) in the solar system and the distribution of the impact speeds, directions, and flux of ISD particles on the Stardust Interstellar Dust Collector during the two collection periods of the m…
Geometry, stratigraphy and evidences for fluid expulsion within Crommelin crater deposits, Arabia Terra, Mars
Rossi, A. P.; Pondrelli, M.; Franchi, F. +1 more
Conical mounds and furrows are widely interpreted as the morphological evidences of fluids expulsion on the martian surface. In the Crommelin crater (equatorial Arabia Terra) furrows and conical mounds are exhumed within light-toned equatorial layered deposits (ELDs). Aim of this paper is to describe these landforms and discuss their potential rel…
Constraining the Age of the NGC 4565 H I Disk Warp: Determining the Origin of Gas Warps
Bell, Eric F.; Holwerda, Benne W.; Monachesi, Antonela +7 more
We have mapped the distribution of young and old stars in the gaseous H I warp of NGC 4565. We find a clear correlation of young stars (<600 Myr) with the warp but no coincident old stars (>1 Gyr), which places an upper limit on the age of the structure. The formation rate of the young stars, which increased ~300 Myr ago relative to the surr…
Discovery of a Gas-rich Companion to the Extremely Metal-poor Galaxy DDO 68
Bailin, Jeremy; McQuinn, Kristen B. W.; Cannon, John M. +17 more
We present H I spectral-line imaging of the extremely metal-poor galaxy DDO 68. This system has a nebular oxygen abundance of only ~3% Z ⊙, making it one of the most metal-deficient galaxies known in the local volume. Surprisingly, DDO 68 is a relatively massive and luminous galaxy for its metal content, making it a significant outlier …
Microlensing Events by Proxima Centauri in 2014 and 2016: Opportunities for Mass Determination and Possible Planet Detection
Anderson, Jay; Bond, Howard E.; Sahu, Kailash C. +1 more
We have found that Proxima Centauri, the star closest to our Sun, will pass close to a pair of faint background stars in the next few years. Using Hubble Space Telescope (HST) images obtained in 2012 October, we determine that the passage close to a mag 20 star will occur in 2014 October (impact parameter 1.''6), and to a mag 19.5 star in 2016 Feb…
Tracing Ram-pressure Stripping with Warm Molecular Hydrogen Emission
Rieke, George H.; Rieke, Marcia J.; Sivanandam, Suresh
We use the Spitzer Infrared Spectrograph to study four infalling cluster galaxies with signatures of ongoing ram-pressure stripping. H2 emission is detected in all four, and two show extraplanar H2 emission. The emission usually has a warm (T ~ 115-160 K) and a hot (T ~ 400-600 K) component that is approximately two orders of…