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RPC-MAG The Fluxgate Magnetometer in the ROSETTA Plasma Consortium
Motschmann, Uwe; Richter, Ingo; Carr, Chris +11 more
The fluxgate magnetometer experiment onboard the ROSETTA spacecraft aims to measure the magnetic field in the interaction region of the solar wind plasma with comet 67P/Churyumov-Gerasimenko. It consists of a system of two ultra light (about 28 g each ) triaxial fluxgate magnetometer sensors, mounted on the 1.5 m long spacecraft boom. The measurem…
I Zw 18 Revisited with HST ACS and Cepheids: New Distance and Age
Saha, A.; Tosi, M.; Clementini, G. +9 more
We present new V- and I-band HST ACS photometry of I Zw 18, the most metal-poor blue compact dwarf (BCD) galaxy in the nearby universe. It has been argued in the past that I Zw 18 is a very young system that started forming stars only <~500 Myr ago, but other work has hinted that older (>~1 Gyr) red giant branch (RGB) stars may also exist. O…
The strong transformation of spiral galaxies infalling into massive clusters at z ~ 0.2
Kneib, J. -P.; Egami, E.; Cortese, L. +8 more
We describe two peculiar galaxies falling into the massive galaxy clusters Abell1689 (z ~ 0.18) and Abell2667 (z ~ 0.23), respectively. Hubble Space Telescope (HST) images show extraordinary trails composed of bright blue knots (-16.5 < M < -11.5mag) and stellar streams associated with each of these systems. Combining optical, near- and mid-…
Mineralogy of the Nili Fossae region with OMEGA/Mars Express data: 2. Aqueous alteration of the crust
Mangold, N.; Bibring, J. -P.; Gondet, B. +9 more
Nili Fossae is a region with fresh exposures of old material. OMEGA spectral data have revealed a strong diversity of minerals in the Nili Fossae region, including mafic minerals and phyllosilicates. Phyllosilicates are found to be primarily Fe-rich smectites (a type of clay minerals). These phyllosilicates are observed only on the Noachian crust,…
The ACS Fornax Cluster Survey. I. Introduction to the Survey and Data Reduction Procedures
Jordán, Andrés; Infante, Leopoldo; Tonry, John L. +7 more
The Fornax Cluster is a conspicuous cluster of galaxies in the southern hemisphere and the second largest collection of early-type galaxies within <~20 Mpc after the Virgo Cluster. In this paper, we present a brief introduction to the ACS Fornax Cluster Survey-a program to image, in the F475W (g475) and F850LP (z850) bandp…
Radar Sounding of the Medusae Fossae Formation Mars: Equatorial Ice or Dry, Low-Density Deposits?
Stofan, Ellen R.; Clifford, Stephen M.; Orosei, Roberto +10 more
The equatorial Medusae Fossae Formation (MFF) is enigmatic and perhaps among the youngest geologic deposits on Mars. They are thought to be composed of volcanic ash, eolian sediments, or an ice-rich material analogous to polar layered deposits. The Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) instrument aboard the Mars Expr…
A model for cyclotron resonance scattering features
Santangelo, A.; Wilms, J.; Kretschmar, P. +5 more
Aims:We study the physics of cyclotron line formation in the high-energy spectra of accreting X-ray pulsars. In particular, we link numerical predictions for the line profiles to results from observational data analysis. Therefore, first we investigate the theoretical predictions and the significance of our model parameters, and second we aim at t…
An evolutionary catalogue of galactic post-AGB and related objects
Szczerba, R.; Siódmiak, N.; Stasińska, G. +1 more
Aims:With the ongoing AKARI infrared sky survey, of much greater sensitivity than IRAS, a wealth of post-AGB objects may be discovered. It is thus time to organize our present knowledge of known post-AGB stars in the galaxy with a view to using it to search for new post-AGB objects among AKARI sources.
Methods: We searched the literature avail…
Enceladus' plume: Compositional evidence for a hot interior
Lunine, Jonathan; Matson, Dennis L.; Castillo, Julie C. +1 more
The combined observations of Saturn's moon Enceladus by the Cassini CAPS, INMS and UVIS instruments detected water vapor geysers in which were present molecular nitrogen (N 2), carbon dioxide (CO 2), methane (CH 4), propane (C 3H 8), acetylene (C 2H 2), and several other …
The fraction of binary systems in the core of 13 low-density Galactic globular clusters
Sarajedini, A.; Beccari, G.; Ferraro, F. R. +2 more
We used deep observations collected with Advanced Camera for Surveys (ACS) at Hubble Space Telescope (HST) to derive the fraction of binary systems in a sample of 13 low-density Galactic globular clusters. By analysing the colour distribution of main-sequence stars we derived the minimum fraction of binary systems required to reproduce the observe…