Search Publications
Features of separatrix regions in magnetic reconnection: Comparison of 2-D particle-in-cell simulations and Cluster observations
Wang, Shui; Huang, Can; Vaivads, Andris +4 more
In collisionless magnetic reconnection, the in-plane Hall currents are carried mainly by the magnetized electrons. The in-plane Hall currents are directed toward the X line along the magnetic field lines just inside the separatrices and away from the X line along the separatrices. Such a current system leads to the quadrupole out-of-plane magnetic…
HST/ACS Hα imaging of the Carina Nebula: outflow activity traced by irradiated Herbig-Haro Jets
Walborn, Nolan R.; Smith, Nathan; Bally, John
We report the discovery of new Herbig-Haro (HH) jets in the Carina Nebula, and we discuss the protostellar outflow activity of a young OB association. These are the first results of an Hα imaging survey of Carina conducted with the Hubble Space Telescope (HST)/Advanced Camera for Surveys. Adding to the one previously known example (HH 666), we det…
The Herschel Lensing Survey (HLS): Overview
Smail, I.; Kneib, J. -P.; Smith, G. P. +32 more
The Herschel Lensing Survey (HLS) will conduct deep PACS and SPIRE imaging of ~40 massive clusters of galaxies. The strong gravitational lensing power of these clusters will enable us to penetrate through the confusion noise, which sets the ultimate limit on our ability to probe the Universe with Herschel. Here we present an overview of our survey…
Direct Observational Evidence of Filament Material Within Interplanetary Coronal Mass Ejections
Lepri, S. T.; Zurbuchen, T. H.
Coronal mass ejections (CMEs) are explosive events that escape the Sun's corona carrying solar material and energy into the heliosphere. The classic picture of a CME observed in the corona presents a "three-part structure," including a bright front at the leading edge indicating dense plasma, a low-density cavity, the possible signature of an embe…
Galaxy formation in the reionization epoch as hinted by Wide Field Camera 3 observations of the Hubble Ultra Deep Field
Hathi, Nimish P.; McCarthy, Patrick J.; Ryan, Russell E. +4 more
We present a large sample of candidate galaxies at z approx 7-10, selected in the Hubble Ultra Deep Field using the new observations of the Wide Field Camera 3 that was recently installed on the Hubble Space Telescope. Our sample is composed of 20 z850-dropouts (four new discoveries), 15 Y105-dropouts (nine new discoveries) a…
Discovery of a Planetary-mass Companion to a Brown Dwarf in Taurus
Luhman, K. L.; McLeod, K. K.; Todorov, K.
We have performed a survey for substellar companions to young brown dwarfs in the Taurus star-forming region using the Wide Field Planetary Camera 2 on board the Hubble Space Telescope. In these data, we have discovered a candidate companion at a projected separation of 0farcs105 from one of the brown dwarfs, corresponding to 15 AU at the distance…
Seismic and Dynamical Solar Models. I. The Impact of the Solar Rotation History on Neutrinos and Seismic Indicators
Turck-Chièze, S.; Marques, J. P.; Palacios, A. +1 more
Solar activity and helioseismology show the limitation of the standard solar model and call for the inclusion of dynamical processes in both convective and radiative zones. In this paper, we concentrate on the radiative zone. We first recall the sensitivity of boron neutrinos to the microscopic physics included in solar standard and seismic models…
Mineralogy and stratigraphy of phyllosilicate-bearing and dark mantling units in the greater Mawrth Vallis/west Arabia Terra area: Constraints on geological origin
Bibring, J. -P.; Poulet, F.; Bishop, J. L. +13 more
Analyses of MRO/CRISM images of the greater Mawrth Vallis region of Mars affirm the presence of two primary phyllosilicate assemblages throughout a region ∼1000 × 1000 km. These two units consist of an Fe/Mg-phyllosilicate assemblage overlain by an Al-phyllosilicate and hydrated silica assemblage. The lower unit contains Fe/Mg-smectites, sometimes…
Star Formation History and X-ray Binary Populations: The Case of the Small Magellanic Cloud
Hatzidimitriou, D.; Zezas, A.; Antoniou, V. +1 more
Using Chandra, XMM-Newton, and optical photometric catalogs we study the young X-ray binary (XRB) populations of the Small Magellanic Cloud. We find that the Be/X-ray binaries (Be-XRBs) are observed in regions with star formation rate bursts ~25-60 Myr ago. The similarity of this age with the age of maximum occurrence of the Be phenomenon (~40 Myr…
Confirmation of X-ray Absorption by Warm-Hot Intergalactic Medium in the Sculptor Wall
Maiolino, Roberto; Canizares, Claude R.; Humphrey, Philip J. +5 more
In a previous paper, we reported a 3σ detection of an absorption line from the warm-hot intergalactic medium (WHIM) using the Chandra and XMM X-ray grating spectra of the blazar H2356-309, the sight line of which intercepts the Sculptor Wall, a large-scale superstructure of galaxies at z ~ 0.03. To verify our initial detection, we obtained a deep …