Search Publications
Elimination of a virtual impactor of 2006 QV89 via deep non-detection
Faggioli, L.; Micheli, M.; Hainaut, O. R. +3 more
Context. As a consequence of the large (and growing) number of near-Earth objects discovered, some are lost before their orbits can be firmly established and long-term recovery ensured. A fraction of these objects present non-negligible chances of impact with the Earth. We present a method of targeted observations that allow us to eliminate that r…
Warm ISM in the Sgr A complex. II. The [C/N] abundance ratio traced by [CII] 158 µm and [NII] 205 µm observations toward the Arched Filaments at the Galactic center
Abel, N.; Stutzki, J.; Simon, R. +2 more
Context. The Arches Cluster - Arched Filaments (AF) system is our Galaxy's prime example of the complexity involved in the interaction between the strong radiation field of numerous OB stars and their surrounding ISM in extremely harsh environments such as the Galactic center (GC) of the Milky Way. It offers a unique opportunity to study the close…
Extreme adaptive optics astrometry of R136. Searching for high proper motion stars
Vakili, F.; Boccaletti, A.; Langlois, M. +9 more
We compared high-contrast near-infrared images of the core of R136 taken by VLT/SPHERE, in two epochs separated by 3.06 years. For the first time we monitored the dynamics of the detected sources in the core of R136 from a ground-based telescope with adaptive optics. The aim of these observations was to search for High prOper Motion cAndidates (HO…
Clustering of red and blue galaxies around high-redshift 3C radio sources as seen by the Hubble Space Telescope
Chiaberge, Marco; West, Michael J.; Haas, Martin +5 more
To properly understand the evolution of high-redshift galaxy clusters, both passive and star-forming galaxies have to be considered. Here we study the clustering environment of 21 radio galaxies and quasars at 1 < z < 2.5 from the third Cambridge catalog (3C). We use optical and near-infrared Hubble Space Telescope images with a 2' field-of-…
[CII] emission properties of the massive star-forming region RCW 36 in a filamentary molecular cloud
Oyabu, S.; Nakagawa, T.; Ojha, D. K. +10 more
Aims: We investigate the properties of [C II] 158 µm emission of RCW 36 in a dense filamentary cloud.
Methods: [C II] observations of RCW 36, covering an area of ~30' × 30', were carried out with a Fabry-Pérot spectrometer on board a 100-cm balloon-borne far-infrared (IR) telescope with an angular resolution of 90''. Using AKARI an…
A meeting at z ∼ 3: Young massive galaxies and an AGN within 30 kpc of the luminous QSO LBQS 0302-0019
Sander, A. A. C.; Shanks, T.; Husemann, B. +2 more
Context. Contrary to expectations from scenarios of black hole growth driven by galaxy interactions and mergers, dual active galactic nuclei (AGN) with kiloparsec separations are rarely observed and are very difficult to identify, in particular at high redshifts (i.e. z > 2).
Aims: Focussing on the recently discovered dual AGN system LBQS …
LIStEN: L' band Imaging Survey for Exoplanets in the North
Henning, Thomas; Ertel, Steve; Musso Barcucci, Arianna +9 more
Context. Planetary systems and debris discs are natural by-products of the star formation process, and they affect each other. The direct imaging technique allows simultaneous imaging of both a companion and the circumstellar disc it resides in, and is thus a valuable tool to study companion-disc interactions. However, the number of systems in whi…
Heavy-element Rydberg transition line emission from the post-giant-evolution star HD 101584
Lindqvist, M.; Olofsson, H.; Black, J. H. +7 more
Context. We report the detection of two lines at millimetre wavelengths towards the immediate surroundings of the post-giant and most likely post-common-envelope star HD 101584 using high-angular-resolution ALMA observations. The circumstellar environment of this object is rich in different molecular species, but we find no viable identifications …
Orbital eccentricities as indicators of stellar populations. A kinematical analysis of the local disc from Gaia DR2 catalogue
Cubarsi, R.; Stojanović, M.; Ninković, S.
Aims: Based on a local sample from Gaia DR2 catalogue composed of 74 339 stars, we are able to derive more accurate kinematic statistics defining the local stellar populations and classify the stars in terms of their planar and vertical orbital eccentricities.
Methods: Firstly, we carried out a kinematical characterisation of stellar pop…
Magnetic flux structuring of the quiet Sun internetwork. Center-to-limb analysis of solar-cycle variations
Faurobert, M.; Ricort, G.
Context. The small-scale magnetism of the quiet Sun has been investigated by various means in recent decades. It is now well established that the quiet Sun contains in total more magnetic flux than active regions and represents an important reservoir of magnetic energy. But the nature and evolution of these fields remain largely unknown.
Aims…