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Unveiling the nature of INTEGRAL objects through optical spectroscopy. VI. A multi-observatory identification campaign
Palazzi, E.; Minniti, D.; Masetti, N. +18 more
Using 8 telescopes in the northern and southern hemispheres, plus archival data from two on-line sky surveys, we performed a systematic optical spectroscopic study of 39 putative counterparts of unidentified or poorly studied INTEGRAL sources in order to determine or at least better assess their nature. This was implemented within the framework of…
On the detectability of Lyα emission in star forming galaxies. The role of dust
Östlin, G.; Hayes, M.; Mas-Hesse, J. M. +2 more
Context: Lyman-alpha (Lyα) radiation is now widely used to investigate the galaxy formation and evolution in the high redshift universe. However, without a rigorous understanding of the processes regulating the Lyα escape fraction, physical interpretations of high-z observations remain questionable.
Aims: We examine six nearby star forming gal…
Late Amazonian glaciation at the dichotomy boundary on Mars: Evidence for glacial thickness maxima and multiple glacial phases
Head, James W.; Marchant, David R.; Dickson, James L.
Lineated valley fill (LVF) in fretted valleys at the dichotomyboundary has been interpreted as glacial in origin. Unknownare (1) the original thickness of the glacier ice, (2) the amountof ice-surface lowering, through sublimation and retreat, toits presently observed level, and (3) whether there were multipleperiods of glaciation. We address thes…
The E ring in the vicinity of Enceladus. I. Spatial distribution and properties of the ring particles
Beckmann, U.; Kempf, S.; Postberg, F. +6 more
Saturn's diffuse E ring is the largest ring of the Solar System and extends from about 3.1R (Saturn radius R=60,330 km) to at least 8R encompassing the icy moons Mimas, Enceladus, Tethys, Dione, and Rhea. After Cassini's insertion into her saturnian orbit in July 2004, the spacecraft performed a number of equatorial as well as steep traversals thr…
Effects of Dust Geometry in Lyα Galaxies at z = 4.4
Finkelstein, Steven L.; Malhotra, Sangeeta; Grogin, Norman +2 more
Equivalent widths (EWs) observed in high-redshift Lyα galaxies could be stronger than the EW intrinsic to the stellar population if dust is present residing in clumps in the interstellar medium (ISM). In this scenario, continuum photons could be extinguished, while the Lyα photons would be resonantly scattered by the clumps, eventually escaping th…
On the kinematic evolution of young local associations and the Scorpius-Centaurus complex
Figueras, F.; Torra, J.; Fernández, D.
Context: Over the last decade, several groups of young (mainly low-mass) stars have been discovered in the solar neighbourhood (closer than ~100 pc), thanks to cross-correlation between X-ray, optical spectroscopy and kinematic data. These young local associations - including an important fraction whose members are Hipparcos stars - offer insights…
Metal-rich multi-phase gas in M 87. AGN-driven metal transport, magnetic-field supported multi-temperature gas, and constraints on non-thermal emission observed with XMM-Newton
Finoguenov, A.; Böhringer, H.; Simionescu, A. +2 more
We use deep (~120 ks) XMM-Newton data of the M 87 halo to analyze its spatially resolved temperature structure and chemical composition. We focus particularly on the regions of enhanced X-ray brightness associated with the inner radio lobes, which are known not to be described very well by single-temperature spectral models. Compared to a simple t…
New observations of the extended hydrogen exosphere of the extrasolar planet HD 209458b
Ehrenreich, D.; Ferlet, R.; Vidal-Madjar, A. +6 more
Context: Atomic hydrogen escaping from the planet
High Metallicity of the X-Ray Gas Up to the Virial Radius of a Binary Cluster of Galaxies: Evidence of Galactic Superwinds at High-Redshift
Reiprich, Thomas H.; Hayashida, Kiyoshi; Matsumoto, Hironori +4 more
We present an analysis of a Suzaku observation of the link region between the galaxy clusters A 399 and A 401. We obtained the metallicity of the intracluster medium (ICM) up to the cluster virial radii for the first time. We determined the metallicity where the virial radii of the two clusters cross each other (∼2 Mpc away from their centers) and…
Water vapour jets inside the plume of gas leaving Enceladus
Hansen, C. J.; Hendrix, A. R.; Colwell, J. E. +7 more
A plume of water vapour escapes from fissures crossing the south polar region of the Saturnian moon Enceladus. Tidal deformation of a thin surface crust above an internal ocean could result in tensile and compressive stresses that would affect the width of the fissures; therefore, the quantity of water vapour released at different locations in Enc…