Search Publications
Transmission Electron Microscopy of CONCORDIA UltraCarbonaceous Antarctic MicroMeteorites (UCAMMs): Mineralogical properties
Engrand, C.; Rouzaud, J. -N.; Duprat, J. +2 more
We performed mineralogical and petrographic studies of three UltraCarbonaceous Antarctic Micrometeorites (UCAMMs) by analytical transmission electron microscopy (TEM). The UCAMMs were identified in the CONCORDIA micrometeorite collection (2002 and 2006) recovered from central Antarctic snow, and are of probable cometary origin. UCAMMs are dominate…
Global maps of anhydrous minerals at the surface of Mars from OMEGA/MEx
Bibring, J. -P.; Gondet, B.; Langevin, Y. +7 more
We here reassess the global distribution of several key mineral species using the entire OMEGA/Mars Express VIS-NIR imaging spectrometer data set, acquired from orbit insertion in January 2004 to August 2010. Thirty-two pixels per degree global maps of ferric oxides, pyroxenes and olivines have been derived. A significant filtering process was app…
On the effects of clouds and hazes in the atmospheres of hot Jupiters: semi-analytical temperature-pressure profiles
Sing, David K.; Heng, Kevin; Pont, Frédéric +1 more
Motivated by the work of Guillot, we present a semi-analytical formalism for calculating the temperature-pressure profiles in hot Jovian atmospheres which includes the effects of clouds/hazes and collision-induced absorption. Using the dual-band approximation, we assume that stellar irradiation and thermal emission from the hot Jupiter occur at di…
LoCuSS: A Dynamical Analysis of X-Ray Active Galactic Nuclei in Local Clusters
Finoguenov, A.; Smith, G. P.; Okabe, N. +7 more
We present a study of the distribution of X-ray active galactic nuclei (AGNs) in a representative sample of 26 massive clusters at 0.15 < z < 0.30, combining Chandra observations sensitive to X-ray point sources of luminosity LX ~ 1042 erg s-1 at the cluster redshift with extensive and highly complete spectro…
The location of reconnection at the magnetopause: Testing the maximum magnetic shear model with THEMIS observations
Fuselier, S. A.; Phan, T. D.; Trattner, K. J. +1 more
Reconnection at the Earth's magnetopause is the mechanism by which magnetic fields in different regions change topology to create open magnetic field lines that allow energy and momentum to flow into the magnetosphere. One of the long-standing open questions about magnetic reconnection is the location of the reconnection line. There are two reconn…
A unique volcanic field in Tharsis, Mars: Pyroclastic cones as evidence for explosive eruptions
Hauber, E.; Brož, P.
Based on theoretical grounds, explosive basaltic volcanism should be common on Mars, yet the available morphological evidence is sparse. We test this hypothesis by investigating a unique unnamed volcanic field north of the shield volcanoes Biblis Patera and Ulysses Patera on Mars, where we observe several small conical edifices and associated lava…
Three-dimensional Evolution of Solar Wind during Solar Cycles 22-24
Manoharan, P. K.
This paper presents an analysis of three-dimensional evolution of solar wind density turbulence and speed at various levels of solar activity between solar cycles 22 and 24. The solar wind data used in this study have been obtained from the interplanetary scintillation (IPS) measurements made at the Ooty Radio Telescope, operating at 327 MHz. Resu…
Validation of the 3D AMR SIP-CESE Solar Wind Model for Four Carrington Rotations
Wu, S. T.; Feng, Xueshang; Xiang, Changqing +5 more
We carry out the adaptive mesh refinement (AMR) implementation of our solar-interplanetary space-time conservation element and solution element (CESE) magnetohydrodynamic model (SIP-CESE MHD model) using a six-component grid system (Feng, Zhou, and Wu, Astrophys. J.655, 1110, 2007; Feng et al., Astrophys. J.723, 300, 2010). By transforming the gov…
Spitzer Observations of Young Red Quasars
Lacy, Mark; Schulz, Bernhard; Urrutia, Tanya +3 more
We present mid-infrared spectra and photometry of 13 redshift 0.4 < z < 1 dust reddened quasars obtained with Spitzer IRS and MIPS. We compare properties derived from their infrared spectral energy distributions (intrinsic active galactic nucleus (AGN) luminosity and far-infrared luminosity from star formation) to the host luminosities and m…
Kinematic Signatures of Bulges Correlate with Bulge Morphologies and Sérsic Index
Bender, Ralf; Drory, Niv; Fisher, David B. +3 more
We use the Marcario Low Resolution Spectrograph at the Hobby-Eberly Telescope to study the kinematics of pseudobulges and classical bulges in the nearby universe. We present major axis rotational velocities, velocity dispersions, and h 3 and h 4 moments derived from high-resolution (σinst ≈ 39 km s-1) sp…