Search Publications
Spatial distribution of Kelvin-Helmholtz instability at low-latitude boundary layer under different solar wind speed conditions
Wang, C.; Guo, X. C.; Li, W. Y.
Using the PPMLR-MHD global simulation model, we examined the Kelvin-Helmholtz (K-H) instability at the low-latitude boundary layer (LLBL) under northward interplanetary magnetic field (IMF) conditions with various solar wind speeds (400, 600, and 800 km/s). The spatial distribution of the K-H wave power in the equatorial plane shows two distinct p…
Spectroscopic analysis of the two subgiant branches of the globular cluster NGC 1851
Bragaglia, A.; Geisler, D.; Villanova, S. +5 more
It has been found that globular clusters host multiple stellar populations. In particular, in NGC 1851 the subgiant branch (SGB) can be divided into two components and the distribution of stars along the horizontal branch (HB) is multimodal. Various authors have found that NGC 1851 possibly has a spread in [Fe/H], but the relation between this spr…
Possible evidence for partial differentiation of asteroid Lutetia from Rosetta
Pätzold, Martin; Weissman, Paul R.; Richter, Ingo +10 more
The petrologic diversity of meteorites demonstrates that planetesimals ranged from unmelted, variably metamorphosed aggregates to fully molten, differentiated bodies. However, partially differentiated bodies have not been unambiguously identified in the asteroid belt. New constraints on the density, composition, and morphology of 21 Lutetia from t…
The Evolution of the Rest-frame V-band Luminosity Function from z = 4: A Constant Faint-end Slope over the Last 12 Gyr of Cosmic History
Marchesini, Danilo; Stefanon, Mauro; Whitaker, Katherine E. +1 more
We present the rest-frame V-band luminosity function (LF) of galaxies at 0.4 <= z < 4.0, measured from a near-infrared selected sample constructed from the NMBS, the FIRES, the FIREWORKS, and the ultra-deep NICMOS and WFC3 observations in the HDFN, HUDF, and GOODS-CDFS, all having high-quality optical-to-mid-infrared data. This unique sample…
Fluvial landforms on fresh impact ejecta on Mars
Mangold, N.
Fluvial valleys provide critical clues to the distribution and state of water throughout the history of the planet Mars. Early in Mars' history (<3.7 Gy), the climate may have been warmer than at present leading to the development of valley networks. Younger valleys formed on volcanic and glacial landforms under colder conditions than experienc…
The abundance, vertical distribution and origin of H2O in Titan’s atmosphere: Herschel observations and photochemical modelling
Hartogh, Paul; Lellouch, Emmanuel; Lara, Luisa M. +4 more
Disk-averaged observations of water vapor in Titan’s atmosphere acquired with the Herschel satellite are reported. We use a combination of unresolved measurements of three H2O rotational lines at 66.4, 75.4 and 108.0 µm with the PACS instrument, and spectrally-resolved observations of two other transitions at 557 GHz (538 µm…
Evolution and Hydrodynamics of the Very Broad X-Ray Line Emission in SN 1987A
Haberl, F.; Sturm, R.; Dwarkadas, V. V. +2 more
Observations of SN 1987A by the Chandra High Energy Transmission Grating (HETG) in 1999 and the XMM-Newton Reflection Grating Spectrometer (RGS) in 2003 show very broad (v-b) lines with a full width at half-maximum (FWHM) of order 104 km s-1 at these times the blast wave (BW) was primarily interacting with the H II region aro…
Physical properties of OSIRIS-REx target asteroid (101955) 1999 RQ36. Derived from Herschel, VLT/ VISIR, and Spitzer observations
Altieri, B.; Küppers, M.; Pál, A. +6 more
In September 2011, the Herschel Space Observatory performed an observation campaign with the PACS photometer observing the asteroid
The A2667 Giant Arc at z = 1.03: Evidence for Large-Scale Shocks at High Redshift
Swinbank, A. M.; Richard, J.; Yuan, T. -T. +1 more
We present the spatially resolved emission line ratio properties of a ~1010 M ⊙ star-forming galaxy at redshift z = 1.03. This galaxy is gravitationally lensed as a triple-image giant arc behind the massive lensing cluster A2667. The main image of the galaxy has magnification factors of 14 ± 2.1 in flux and ~2 × 7 in area, yi…
CANDELS: Correlations of Spectral Energy Distributions and Morphologies with Star formation Status for Massive Galaxies at z ~ 2
Ferguson, Henry C.; Hathi, Nimish P.; Lucas, Ray A. +17 more
We present a study on spectral energy distributions, morphologies, and star formation for an IRAC-selected extremely red object sample in the GOODS Chandra Deep Field-South. This work was enabled by new HST/WFC3 near-IR imaging from the CANDELS survey as well as the deepest available X-ray data from Chandra 4 Ms observations. This sample consists …