Search Publications
Carbon and oxygen in metal-poor halo stars
Asplund, M.; Amarsi, A. M.; Nissen, P. E. +2 more
Carbon and oxygen are key tracers of the Galactic chemical evolution; in particular, a reported upturn in [C/O] towards decreasing [O/H] in metal-poor halo stars could be a signature of nucleosynthesis by massive Population III stars. We reanalyse carbon, oxygen, and iron abundances in 39 metal-poor turn-off stars. For the first time, we take into…
Evidence for ram-pressure stripping in a cluster of galaxies at z = 0.7
Pointecouteau, E.; Boselli, A.; Brinchmann, J. +10 more
Multi-Unit Spectroscopic Explorer (MUSE) observations of the cluster of galaxies CGr32 (M200 ≃ 2 × 1014 M⊙) at z = 0.73 reveal the presence of two massive star-forming galaxies with extended tails of diffuse gas detected in the [O II]λλ3727-3729 Å emission-line doublet. The tails, which have a cometary shape with a…
Planck's Dusty GEMS. VII. Atomic carbon and molecular gas in dusty starburst galaxies at z = 2 to 4
Kneissl, R.; Le Floc'h, E.; Omont, A. +5 more
The bright 3P1-3P0 ([CI] 1-0) and 3P2-3P1 ([CI] 2-1) lines of atomic carbon are becoming more and more widely employed as tracers of the cold neutral gas in high-redshift galaxies. Here we present observations of these lines in the 11 galaxies of the set of Pla…
The VLT-FLAMES Tarantula Survey. XXX. Red stragglers in the clusters Hodge 301 and SL 639
van Loon, J. Th.; Lennon, D. J.; Herrero, A. +10 more
Aims: We estimate physical parameters for the late-type massive stars observed as part of the VLT-FLAMES Tarantula Survey (VFTS) in the 30 Doradus region of the Large Magellanic Cloud (LMC).
Methods: The observational sample comprises 20 candidate red supergiants (RSGs) which are the reddest ((B - V) > 1 mag) and brightest (V < 16 …
Radio continuum size evolution of star-forming galaxies over 0.35 < z < 2.25
Bondi, M.; Magnelli, B.; Smolčić, V. +18 more
To better constrain the physical mechanisms driving star formation, we present the first systematic study of the radio continuum size evolution of star-forming galaxies (SFGs) over the redshift range 0.35 < z < 2.25. We use the VLA COSMOS 3 GHz map (noise rms = 2.3 µJy beam-1, θbeam = 0.75 arcsec) to construct a m…
Molecular gas and dust properties of galaxies from the Great Observatories All-sky LIRG Survey
Sanders, D. B.; Frayer, D. T.; Kim, D. -C. +23 more
We present IRAM-30 m Telescope 12CO and 13CO observations of a sample of 55 luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) in the local universe. This sample is a subset of the Great Observatory All-Sky LIRG Survey (GOALS), for which we use ancillary multi-wavelength data to better understand their interstell…
Galactic tide and local stellar perturbations on the Oort cloud: creation of interstellar comets
Brown, A. G. A.; Torres, S.; Portegies Zwart, S. +1 more
Comets in the Oort cloud evolve under the influence of internal and external perturbations, such as giant planets, stellar passages, and the Galactic gravitational tidal field. We aim to study the dynamical evolution of the comets in the Oort cloud, accounting for the perturbation of the Galactic tidal field and passing stars. We base our study on…
Molecular complexity on disc scales uncovered by ALMA. Chemical composition of the high-mass protostar AFGL 4176
van Dishoeck, Ewine F.; Hogerheijde, Michiel R.; Ligterink, Niels F. W. +4 more
Context. The chemical composition of high-mass protostars reflects the physical evolution associated with different stages of star formation. In addition, the spatial distribution and velocity structure of different molecular species provide valuable information on the physical structure of these embedded objects. Despite an increasing number of i…
Relation between winds and jets in radio-loud AGN
Mehdipour, Missagh; Costantini, Elisa
We have investigated the relation between the two modes of outflow (wind and jet) in radio-loud active galactic nuclei (AGN). For this study we have carried out a systematic and homogeneous analysis of XMM-Newton spectra of a sample of 16 suitable radio-loud Seyfert-1 AGN. The ionised winds in these AGN are parameterised through high-resolution X-…
Gaia-DR2 extended kinematical maps . I. Method and application
López-Corredoira, M.; Sylos Labini, F.
Context. The Gaia Collaboration has used Gaia-DR2 sources with six-dimensional (6D) phase space information to derive kinematical maps within 5 kpc of the Sun, which is a reachable range for stars with relative error in distance lower than 20%.
Aims: Here we aim to extend the range of distances by a factor of two to three, thus adding the ran…