Search Publications
Possible depletion of metals into dust grains in the core of the Centaurus cluster of galaxies
Mernier, F.; Werner, N.; Lakhchaura, K.
We present azimuthally averaged metal abundance profiles from a full, comprehensive, and conservative re-analysis of the deep (∼800 ks total net exposure) Chandra/ACIS-S observation of the Centaurus cluster core (NGC 4696). After carefully checking various sources of systematic uncertainties, including the choice of the spectral deprojection metho…
Spectroscopic orbits of nearby stars
Tokovinin, A.; Sperauskas, J.; Deveikis, V.
Aims: We observed stars with variable radial velocities to determine their spectroscopic orbits.
Methods: Velocities are presented of 132 targets taken over a time span reaching 30 years. These were measured with the correlation radial velocity spectrometers (1917 velocities) and the new VUES echelle spectrograph (627 velocities), with a…
The MURALES survey. II. Presentation of MUSE observations of 20 3C low-z radio galaxies and first results
Marconi, A.; Capetti, A.; Gilli, R. +12 more
We present observations of a complete sub-sample of 20 radio galaxies from the Third Cambridge Catalog (3C) with redshift < 0.3 obtained from VLT/MUSE optical integral field spectrograph. These data have been obtained as part of the survey MURALES (a MUse RAdio Loud Emission line Snapshot survey) with the main goal of exploring the active galac…
Radiative and mechanical feedback into the molecular gas in the Large Magellanic Cloud. II. 30 Doradus
Lebouteiller, V.; Madden, S. C.; Galliano, F. +6 more
With an aim of probing the physical conditions and excitation mechanisms of warm molecular gas in individual star-forming regions, we performed Herschel SPIRE Fourier Transform Spectrometer (FTS) observations of 30 Doradus in the Large Magellanic Cloud. In our FTS observations, important far-infrared (FIR) cooling lines in the interstellar medium,…
A comprehensive study of NGC 2345, a young open cluster with a low metallicity
Castro, N.; Negueruela, I.; Tabernero, H. M. +3 more
Context. NGC 2345 is a young open cluster that hosts seven blue and red supergiants, low metallicity, and a high fraction of Be stars, which makes it a privileged laboratory to study stellar evolution.
Aims: We aim to improve the determination of the cluster parameters and study the Be phenomenon. Our objective is also to characterise the sev…
Local Bubble contribution to the 353-GHz dust polarized emission
Pelgrims, V.; Skalidis, R.
It has not been shown so far whether the diffuse Galactic polarized emission at frequencies relevant for cosmic microwave background (CMB) studies originates from nearby or more distant regions of our Galaxy. This questions previous attempts that have been made to constrain magnetic field models at local and large scales. The scope of this work is…
The HST/ACS star formation history of the Tucana dwarf spheroidal galaxy: clues from the horizontal branch
Salaris, M.; Monelli, M.; Tolstoy, E. +2 more
We report a new star formation history for the Tucana dwarf spheroidal galaxy, obtained from a new look at a deep HST/ACS colour-magnitude diagram. We combined information from the main sequence turn-off and the horizontal branch to resolve the ancient star formation rates on a finer temporal scale than previously possible. We show that Tucana exp…
The CARMENES search for exoplanets around M dwarfs. The enigmatic planetary system GJ 4276: one eccentric planet or two planets in a 2:1 resonance?
Schmitt, J. H. M. M.; Nagel, E.; Amado, P. J. +25 more
We report the detection of a Neptune-mass exoplanet around the M4.0 dwarf GJ 4276 (G 232-070) based on radial velocity (RV) observations obtained with the CARMENES spectrograph. The RV variations of GJ 4276 are best explained by the presence of a planetary companion that has a minimum mass of mb sin i ≈ 16 M⊕ on a Pb
The EUV spectrum of the Sun: Quiet- and active-Sun irradiances and chemical composition
Del Zanna, G.
We benchmark new atomic data against a selection of irradiances obtained from medium-resolution quiet-Sun spectra in the extreme ultraviolet (EUV), from 60 to 1040 Å. We used as a baseline the irradiances measured during solar minimum on 2008 April 14 by the prototype (PEVE) of the Solar Dynamics Observatory Extreme ultraviolet Variability Experim…
HST/COS observations of the newly discovered obscuring outflow in NGC 3783
Kaastra, J. S.; Kriss, G. A.; Arav, N. +24 more
Aims: To understand the nature of transient obscuring outflows in active galactic nuclei, we use simultaneous multiwavelength observations with XMM-Newton, NuSTAR, the Hubble Space Telescope (HST), and the Max Planck Gesellschaft/European Southern Observatory (ESO) 2.2 m telescope triggered by soft X-ray absorption detected by Swift.
Met…