Search Publications
Gas and dust in the star-forming region ρ Oph A. II. The gas in the PDR and in the dense cores
Liseau, R.; Larsson, B.
Context. The evolution of interstellar clouds of gas and dust establishes the prerequisites for star formation. The pathway to the formation of stars can be studied in regions that have formed stars, but which at the same time also display the earliest phases of stellar evolution, i.e. pre-collapse/collapsing cores (Class -1), protostars (Class 0)…
A high spectral resolution map of the nuclear emitting regions of NGC 7582
Bianchi, S.; Piconcelli, E.; Reeves, J. N. +2 more
We present the results of the spatial and spectral analysis of the deep ( 200 ks) Chandra HETG observation of the changing look AGN NGC 7582. During this long Chandra observation, NGC 7582 was in a highly obscured state. Therefore, we also consider a short ( 24 ks) Suzaku observation, which caught NGC 7582 in a Compton thick state. This allows us …
Investigating prominence turbulence with Hinode SOT Dopplergrams
Ichimoto, K.; Matsumoto, T.; Hillier, A.
Quiescent prominences host a diverse range of flows, including Rayleigh-Taylor instability driven upflows and impulsive downflows, and so it is no surprise that turbulent motions also exist. As prominences are believed to have a mean horizontal guide field, investigating any turbulence they host could shed light on the nature of magnetohydrodynami…
Fourier-space combination of Planck and Herschel images
Henning, Th.; Ballesteros-Paredes, J.; Abreu-Vicente, J. +3 more
Context. Herschel has revolutionized our ability to measure column densities (NH) and temperatures (T) of molecular clouds thanks to its far infrared multiwavelength coverage. However, the lack of a well defined background intensity level in the Herschel data limits the accuracy of the NH and T maps.
Aims: We aim to prov…
Spectroscopic study of the elusive globular cluster ESO452-SC11 and its surroundings
Hansen, Camilla Juul; Kunder, Andrea; Koch, Andreas
Globular clusters (GCs) have long been recognized as being amongst the oldest objects in the Galaxy. As such, they have the potential of playing a pivotal role in deciphering the Milky Way's early history. Here we present the first spectroscopic study of the low-mass system ESO452-SC11 using the AAOmega multifibre spectrograph at medium resolution…
Faint warm debris disks around nearby bright stars explored by AKARI and IRSF
Inutsuka, Shu-ichiro; Onaka, Takashi; Kaneda, Hidehiro +5 more
Context. Debris disks are important observational clues for understanding planetary-system formation process. In particular, faint warm debris disks may be related to late planet formation near 1 au. A systematic search of faint warm debris disks is necessary to reveal terrestrial planet formation.
Aims: Faint warm debris disks show excess em…
Multi-epoch observations with high spatial resolution of multiple T Tauri systems
Ábrahám, Péter; Brandner, Wolfgang; Köhler, Rainer +4 more
Context. In multiple pre-main-sequence systems the lifetime of circumstellar discs appears to be shorter than around single stars, and the actual dissipation process may depend on the binary parameters of the systems.
Aims: We report high spatial resolution observations of multiple T Tauri systems at optical and infrared wavelengths. We deter…
X-ray survey of the North-America and Pelican star-forming complex (NGC 7000/IC 5070)
Damiani, Francesco; Pillitteri, Ignazio; Prisinzano, Loredana
Aims: We present the first extensive X-ray study of the North-America and Pelican star-forming region (NGC 7000/IC 5070), with the aim of finding and characterizing the young population of this cloud.
Methods: X-ray data from Chandra (four pointings) and XMM-Newton (seven pointings) were reduced and source detection algorithm applied to …
Orbiting a binary. SPHERE characterisation of the HD 284149 system
Avenhaus, H.; Fantinel, D.; Messina, S. +53 more
Aims: In this paper we present the results of the SPHERE observation of the
Methods: We observed
The SOPHIE search for northern extrasolar planets. XII. Three giant planets suitable for astrometric mass determination with Gaia
Bouchy, F.; Deleuil, M.; Moutou, C. +22 more
We present new radial velocity measurements for three low-metallicity solar-like stars observed with the SOPHIE spectrograph and its predecessor ELODIE, both installed at the 193 cm telescope of the Haute-Provence Observatory, allowing the detection and characterization of three new giant extrasolar planets in intermediate periods of 1.7 to 3.7 yr…