Search Publications
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…
Dissecting bombs and bursts: non-LTE inversions of low-atmosphere reconnection in SST and IRIS observations
Carlsson, M.; Rouppe van der Voort, L. H. M.; de la Cruz Rodríguez, J. +3 more
Ellerman bombs and UV bursts are transient brightenings that are ubiquitously observed in the lower atmospheres of active and emerging flux regions. As they are believed to pinpoint sites of magnetic reconnection in reconfiguring fields, understanding their occurrence and detailed evolution may provide useful insight into the overall evolution of …
Swift UVOT near-UV transit observations of WASP-121 b
Schmitt, J. H. M. M.; Czesla, S.; Salz, M. +3 more
Close-in gas planets are subject to continuous photoevaporation that can erode their volatile envelopes. Today, ongoing mass loss has been confirmed in a few individual systems via transit observations in the ultraviolet spectral range. We demonstrate that the Ultraviolet/Optical Telescope (UVOT) onboard the Neil Gehrels Swift Observatory enables …
The EBLM Project. V. Physical properties of ten fully convective, very-low-mass stars
Smalley, Barry; Hellier, Coel; Triaud, Amaury H. M. J. +28 more
Measurements of the physical properties of stars at the lower end of the main sequence are scarce. In this context we report masses, radii and surface gravities of ten very-low-mass stars in eclipsing binary systems, with orbital periods of the order of several days. The objects probe the stellar mass-radius relation in the fully convective regime…
SPHERE view of the jet and the envelope of RY Tauri
Ménard, F.; Fantinel, D.; Podio, L. +40 more
Context. Jets are rarely associated with pre-main sequence intermediate-mass stars. This contrasts with the frequent detection of jets in lower mass or younger stars. Optical and near-IR observations of jet-driving sources are often hindered by the presence of a natal envelope.
Aims: Jets around partly embedded sources are a useful diagnostic…