Search Publications
On the application of simple rift basin models to the south polar region of Enceladus
Liemohn, M. W.; Walker, C. C.; Bassis, J. N.
The south polar terrain (SPT) of Saturn's moon Enceladus is a mysteriously active region that exhibits intriguing tectonic signatures and widespread fracturing. The central region of the nearly-circular SPT is depressed into the surface by a few hundred meters and bounded by a ring of cliffs roughly 1 km high. In this study, we investigate whether…
Spatially Resolved Kinematics of the Central Regions of M83: Hidden Mass Signatures and the Role of Supernovae
Colina, L.; Davies, R.; Orban de Xivry, G. +1 more
The barred grand-design spiral M83 (NGC 5236) is one of the most studied galaxies given its proximity, orientation, and particular complexity. Nonetheless, many aspects of the central regions remain controversial, conveying our limited understanding of the inner gas and stellar kinematics, and ultimately of the nucleus evolution. In this work, we …
Relaxation of Magnetic Field Relative to Plasma Density Revealed from Microwave Zebra Patterns Associated with Solar Flares
Yu, Sijie; Tan, Baolin; Yan, Yihua
It is generally considered that the emission of microwave zebra pattern (ZP) structures requires high density and high temperature, which is similar to the situation of the flaring region where primary energy is released. Therefore, a parameter analysis of ZPs may reveal the physical conditions of the flaring source region. This work investigates …
The observed composition of ions outflowing from Titan
Luhmann, J. G.; Mitchell, D. G.; Wahlund, J. -E. +8 more
We report on Cassini Ion and Neutral Mass Spectrometer (INMS) observations above Titan's exobase at altitudes of 2225 km to 3034 km. We observe significant densities of CH5+, HCNH+ and C2H5+ that require ion-molecule reactions to be produced in the quantities observed. The measured …
A Corona Australis cloud filament seen in NIR scattered light. III. Modelling and comparison with Herschel sub-millimetre data
Juvela, M.; White, G. J.; Könyves, V. +3 more
Context. The dust is an important tracer of dense interstellar clouds but its properties are expected to undergo changes affecting the scattering and emitting properties of the grains. With recent Herschel observations, the northern filament of the Corona Australis cloud has now been mapped in a number of bands from 1.2 µm to 870 µm. T…
INTEGRAL and Swift/XRT observations of IGR J18179-1621
Torres, D. F.; Papitto, A.; Zhang, S. +3 more
IGR J18179-1621 is a hard X-ray binary transient discovered recently by INTEGRAL. Here we report on detailed timing and spectral analysis of IGR J18179-1621 in X-rays based on available INTEGRAL and Swift data. From the INTEGRAL analysis, IGR J18179-1621 is detected with a significance of 21.6σ in the 18-40 keV band by ISGRI and 15.3σ in the 3-25 …
The globular cluster system of NGC 1316. II. The extraordinary object SH2
Dirsch, B.; Richtler, T.; Bassino, L. P. +2 more
Context. SH2 has been described as an isolated HII-region, located about 6.5' south of the nucleus of NGC 1316 (Fornax A), a merger remnant in the the outskirts of the Fornax cluster of galaxies.
Aims: We give a first, preliminary description of the stellar content and environment of this remarkable object.
Methods: We used photometric d…
Deep Ultraviolet Luminosity Functions at the Infall Region of the Coma Cluster
Hornschemeier, A. E.; Smith, R.; Mobasher, B. +5 more
We have used deep GALEX observations at the infall region of the Coma cluster to measure the faintest ultraviolet (UV) luminosity functions (LFs) presented for a rich galaxy cluster thus far. The Coma UV LFs are measured to M UV = -10.5 in the GALEX FUV and NUV bands, or 3.5 mag fainter than previous studies, and reach the dwarf early-t…
New astrometric observations of Deimos with the SRC on Mars Express
Oberst, J.; Matz, K. -D.; Hoffmann, H. +6 more
Between July 2005 and July 2011 Mars Express performed 50 Deimos approaches. 136 super resolution channel (SRC) images were acquired and used for astrometric (positional) measurements of the small Martian satellite. For this study, we have developed a new technique, in which the center-of-figure of the odd-shaped Deimos is determined by fitting th…
Planetary companions around the metal-poor star HIP 11952
Caffau, E.; Fedele, D.; Henning, Th. +6 more
Aims: We carried out a radial-velocity survey to search for planets around metal-poor stars. In this paper we report the discovery of two planets around HIP 11952, a metal-poor star with [Fe/H] = -1.9 that belongs to our target sample.
Methods: Radial velocity variations of HIP 11952 were monitored systematically with FEROS at the 2.2 m …