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Cassini detection of water-group pick-up ions in the Enceladus torus
Thomsen, M. F.; Wilson, R. J.; Tokar, R. L. +8 more
This study reports direct detection by the Cassini plasma spectrometer of freshly-produced water-group pick-up ions within the proposed Enceladus torus, a radially narrow toroidal region surrounding Saturn that contains a high density of water-group neutrals. This torus is produced by the icy plumes observed near the south pole of Enceladus. The i…
The overall configuration of the interplanetary magnetic field upstream of Saturn as revealed by Cassini observations
Dougherty, M. K.; Jackman, C. M.; Forsyth, R. J.
The Cassini spacecraft approached Saturn during the declining phase of the solar cycle, at a time when the heliosphere was highly structured by compressions and rarefactions associated with corotating interaction regions (CIRs). We examine in detail the hourly averaged interplanetary magnetic field (IMF) data prior to Saturn Orbit Insertion and du…
Deep Spectroscopy of Systematically Surveyed Extended Lyα Sources at z ~ 3-5
Ouchi, Masami; Shimasaku, Kazuhiro; Ueda, Yoshihiro +4 more
Spatially extended Lyα sources that are faint and/or compact in continuum are candidates for extremely young (lesssim107 yr) galaxies at high redshifts. We present medium-resolution (R ~ 2000) VLT/VIMOS spectroscopy of 18 such extended Lyα sources found in our previous study at z ~ 3-5. The deep spectroscopy showed that all 18 objects h…
Hard X-Ray Emission of the Microquasar GRO J1655-40 during the Rise of Its 2005 Outburst
Joinet, A.; Kalemci, E.; Senziani, F.
We present an analysis of the high-energy emission of the Galactic black hole GRO J1655-40 at the beginning of its 2005 outburst. The data from 458 ks of INTEGRAL observations, spread over 4 weeks, are analyzed, along with the existing simultaneous RXTE and Swift data. The high-energy data allow us to detect the presence of a high-energy cutoff an…
On the Origin of Bimodal Horizontal Branches in Massive Globular Clusters: The Case of NGC 6388 and NGC 6441
Joo, Seok-Joo; Han, Sang-Il; Ree, Chang H. +3 more
Despite the efforts of the past decade, the origin of the bimodal horizontal branch (HB) found in some globular clusters (GCs) remains a conundrum. Inspired by the discovery of multiple stellar populations in the most massive Galactic GC, ω Centauri, we investigate the possibility that two distinct populations may coexist and are responsible for t…
The 12C/ 13C isotopic ratio in Titan hydrocarbons from Cassini/CIRS infrared spectra
Irwin, P. G. J.; Teanby, N. A.; de Kok, R. +9 more
We have analyzed infrared spectra of Titan recorded by the Cassini Composite Infrared Spectrometer (CIRS) to measure the isotopic ratio 12C/ 13C in each of three chemical species in Titan's stratosphere: CH 4, C 2H 2 and C 2H 6. This is the first measurement of 12
Observation and Modeling of Coronal "Moss" With the EUV Imaging Spectrometer on Hinode
Winebarger, Amy R.; Warren, Harry P.; Doschek, George A. +2 more
Observations of transition region emission in solar active regions represent a powerful tool for determining the properties of hot coronal loops. We present the analysis of new observations of active region moss taken with the Extreme Ultraviolet Imaging Spectrometer (EIS) on the Hinode satellite. EIS observations of a density sensitive Fe XII lin…
Flares from a candidate Galactic magnetar suggest a missing link to dim isolated neutron stars
Hanlon, L.; McBreen, B.; Bremer, M. +39 more
Magnetars are young neutron stars with very strong magnetic fields of the order of 1014-1015G. They are detected in our Galaxy either as soft γ-ray repeaters or anomalous X-ray pulsars. Soft γ-ray repeaters are a rare type of γ-ray transient sources that are occasionally detected as bursters in the high-energy sky. No optical…
The characteristics of the IR emission features in the spectra of Herbig Ae stars: evidence for chemical evolution
Waters, L. B. F. M.; Henning, T.; Tielens, A. G. G. M. +4 more
Context: Infrared (IR) spectra provide a prime tool to study the characteristics of polycyclic aromatic hydrocarbon (PAH) molecules in regions of star formation. Herbig Ae/Be stars are a class of young pre-main sequence stellar objects of intermediate mass. They are known to have varying amounts of natal cloud material still present in their direc…
Carriers of the mid-IR emission bands in PNe reanalysed. Evidence of a link between circumstellar and interstellar aromatic dust
Joblin, C.; Szczerba, R.; Berné, O. +1 more
Context: It has been shown that the diversity of the aromatic emission features can be rationalized into different classes of objects, in which differences between circumstellar and interstellar matter are emphasised.
Aims: We probe the links between the mid-IR emitters observed in planetary nebulae (PNe) and their counterparts in the interste…