Search Publications
The VMC survey. XXVIII. Improved measurements of the proper motion of the Galactic globular cluster 47 Tucanae
Sun, Ning-Chen; de Grijs, Richard; Ripepi, Vincenzo +10 more
We use deep multi-epoch point-spread function (PSF) photometry taken with the Visible and Infrared Survey Telescope for Astronomy (VISTA) to measure and analyze the proper motions of stars within the Galactic globular cluster 47 Tucanae (47 Tuc, NGC 104). The observations are part of the ongoing near-infrared VISTA survey of the Magellanic Cloud s…
The environment of the wind-wind collision region of η Carinae
Walter, R.; Panagiotou, C.
Context. η Carinae is a colliding wind binary hosting two of the most massive stars and featuring the strongest wind collision mechanical luminosity. The wind collision region of this system is detected in X-rays and γ-rays and offers a unique laboratory for the study of particle acceleration and wind magneto-hydrodynamics. Aim. Our main goal is t…
A tail like no other. The RPC-MAG view of Rosetta's tail excursion at comet 67P/Churyumov-Gerasimenko
Goetz, Charlotte; Richter, Ingo; Volwerk, Martin +4 more
Context. The Rosetta Plasma Consortium (RPC) magnetometer (MAG) data during the tail excursion in March-April 2016 are used to investigate the magnetic structure of and activity in the tail region of the weakly outgassing comet 67P/Churyumov-Gerasimenko (67P).
Aims: The goal of this study is to compare the large scale (near) tail structure wi…
The December 2015 re-brightening of V404 Cygni. Variable absorption from the accretion disc outflow
Motta, S. E.; Sánchez-Fernández, C.; Kuulkers, E. +1 more
In December 2015 the black hole binary V404 Cyg underwent a secondary outburst after the main June 2015 event. We monitored this re-brightening with the INTEGRAL and Swift satellites, and in this paper we report the results of the time-resolved spectral analysis of these data. The December outburst shared several characteristics with the June even…
Herschel spectral-line mapping of the HH211 protostellar system
Güdel, Manuel; Ray, Tom; Dionatos, Odysseas
Context. Mid- and far-infrared observations of the environment around embedded protostars reveal a plethora of high-excitation molecular and atomic emission lines. A number of different mechanisms for the origin of these lines have been proposed, including shocks induced by protostellar jets and radiation by the embedded protostar interacting with…
TOPoS. V. Abundance ratios in a sample of very metal-poor turn-off stars
Steffen, M.; Ludwig, H. -G.; Bonifacio, P. +12 more
Context. Extremely metal-poor stars are keys to understand the early evolution of our Galaxy. The ESO large programme TOPoS has been tailored to analyse a new set of metal-poor turn-off stars, whereas most of the previously known extremely metal-poor stars are giant stars.
Aims: Sixty five turn-off stars (preselected from SDSS spectra) have b…
Early phases in the stellar and substellar formation and evolution. Infrared and submillimeter data in the Barnard 30 dark cloud
Eiroa, C.; Bayo, A.; Huélamo, N. +10 more
Aims: The early evolutionary stage of brown dwarfs (BDs) is not very well characterized, especially during the embedded phase. Our goal is to gain insight into the dominant formation mechanism of very low-mass objects and BDs.
Methods: We have conducted deep observations at 870 µm obtained with the LABOCA bolometer at the APEX tele…
The MURALES survey. I. A dual AGN in the radio galaxy 3C 459?
Marconi, A.; Capetti, A.; Gilli, R. +12 more
We observed the FR II radio galaxy 3C 459 (z = 0.22) with the MUSE spectrograph at the Very Large Telescope (VLT) as part of the MURALES project (a MUse RAdio Loud Emission line Snapshot survey). We detected diffuse nuclear emission and a filamentary ionized gas structure forming a one-sided, triangular-shaped region extending out to ∼80 kpc. The …
MUSE observations of the counter-rotating nuclear ring in NGC 7742
Coccato, Lodovico; Sarzi, Marc; Elmegreen, Bruce G. +4 more
Aims: We present results from MUSE observations of the nearly face-on disk galaxy NGC 7742. This galaxy hosts a spectacular nuclear ring of enhanced star formation, which is unusual in that it is hosted by a non-barred galaxy, and because this star formation is most likely fuelled by externally accreted gas that counter-rotates with respect t…
The XXL Survey: XXXIV. Double irony in XXL-North. A tale of two radio galaxies in a supercluster at z = 0.14
Chiappetti, L.; Smolčić, V.; Pierre, M. +21 more
Aims: We show how the XXL multiwavelength survey can be used to shed light on radio galaxies and their environment.
Methods: Two prominent radio galaxies were identified in a visual examination of the mosaic of XXL-North obtained with the Giant Metrewave Radio Telescope at 610 MHz. Counterparts were searched for in other bands. Spectrosc…