Search Publications
In pursuit of giants. I. The evolution of the dust-to-stellar mass ratio in distant dusty galaxies
Gómez-Guijarro, C.; Małek, K.; Feltre, A. +11 more
The dust-to-stellar mass ratio (Mdust/M⋆) is a crucial, albeit poorly constrained, parameter for improving our understanding of the complex physical processes involved in the production of dust, metals, and stars in galaxy evolution. In this work, we explore trends of Mdust/M⋆ with different physical par…
Collimated synchrotron threads linking the radio lobes of ESO 137-006
Govoni, F.; Ramaila, A. J. T.; Serra, P. +14 more
We present MeerKAT 1000 MHz and 1400 MHz observations of a bright radio galaxy in the southern hemisphere, ESO 137-006. The galaxy lies at the centre of the massive and merging Norma galaxy cluster. The MeerKAT continuum images (rms ∼0.02 mJy beam-1 at ∼10″ resolution) reveal new features that have never been seen in a radio galaxy befo…
Hic sunt dracones: Cartography of the Milky Way spiral arms and bar resonances with Gaia Data Release 2
Katz, D.; Haywood, M.; Gerhard, O. +5 more
In this paper we introduce a new method for analysing Milky Way phase-space which allows us to reveal the imprint left by the Milky Way bar and spiral arms on the stars with full phase-space data in Gaia Data Release 2. The unprecedented quality and extended spatial coverage of these data allowed us to discover six prominent stellar density struct…
The Gaia reference frame for bright sources examined using VLBI observations of radio stars
Lindegren, Lennart
Context. Positions and proper motions of Gaia sources are expressed in a reference frame that ideally should be non-rotating relative to distant extragalactic objects, coincident with the International Celestial Reference System (ICRS), and consistent across all magnitudes. For sources fainter than 16th magnitude, this is achieved through Gaia's d…
The GALAH survey: multiple stars and our Galaxy. I. A comprehensive method for deriving properties of FGK binary stars
Munari, U.; Wittenmyer, R. A.; Stello, D. +24 more
Context. Binary stellar systems form a large fraction of the Galaxy's stars. They are useful as laboratories for studying the physical processes taking place within stars, and must be correctly taken into account when observations of stars are used to study the structure and evolution of the Galaxy. The advent of large-scale spectroscopic and phot…
An all-sky proper-motion map of the Sagittarius stream using Gaia DR2
Jordi, C.; Anders, F.; Helmi, A. +4 more
Aims: We aim to measure the proper motion along the Sagittarius stream, which is the missing piece in determining its full 6D phase space coordinates.
Methods: We conduct a blind search of over-densities in proper motion from the Gaia second data release in a broad region around the Sagittarius stream by applying wavelet transform techni…
The ALPINE-ALMA [CII] survey. Circumgalactic medium pollution and gas mixing by tidal stripping in a merging system at z ∼ 4.57
Maiolino, R.; Schaerer, D.; Béthermin, M. +25 more
We present ALMA observations of a merging system at z ∼ 4.57, observed as a part of the ALMA Large Program to INvestigate [CII] at Early times (ALPINE) survey. Combining ALMA [CII]158 µm and far-infrared continuum data with multi-wavelength ancillary data, we find that the system is composed of two massive (M⋆ ≳ 1010 M<…
Shadowing and multiple rings in the protoplanetary disk of HD 139614
Ménard, F.; Matter, A.; Henning, T. +20 more
Context. Shadows in scattered light images of protoplanetary disks are a common feature and support the presence of warps or misalignments between disk regions. These warps are possibly caused by an inclined (sub-)stellar companion embedded in the disk.
Aims: We aim to study the morphology of the protoplanetary disk around the Herbig Ae star …
Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era
Jasniewicz, G.; Lagarde, N.; Smiljanic, R. +7 more
Context. Li is extensively known to be a good tracer of non-standard mixing processes occurring in stellar interiors.
Aims: We present the results of a new large Li survey in red giant stars and combine it with surveys from the literature to probe the impact of rotation-induced mixing and thermohaline double-diffusive instability along stella…
GOODS-ALMA: The slow downfall of star formation in z = 2-3 massive galaxies
Magnelli, B.; Daddi, E.; Elbaz, D. +34 more
We investigate the properties of a sample of 35 galaxies, detected with the Atacama Large Millimeter/Submillimeter Array (ALMA) at 1.1 mm in the GOODS-ALMA field (area of 69 arcmin2, resolution = 0.60″, rms ≃ 0.18 mJy beam-1). Using the ultraviolet-to-radio deep multiwavelength coverage of the GOODS-South field, we fit the sp…