Search Publications
Impact of the Galactic bar on tidal streams within the Galactic disc. The case of the tidal stream of the Hyades
Laporte, Chervin F. P.; de Laverny, Patrick; Famaey, Benoit +5 more
Tidal streams of disrupted clusters are powerful probes of the gravitational potential of the Galaxy and they are routinely detected in the stellar halo of the Milky Way. It was recently shown that tidal streams of open clusters can now also be detected within the Milky Way disc. In this work, we highlight the fact that disc tidal streams also pro…
The formation history of our Galaxy's nuclear stellar disc constrained from HST observations of the Quintuplet field
Rich, R. M.; Lu, J.; Nogueras-Lara, F. +9 more
Context. Until recently it was thought that the nuclear stellar disc at the centre of our Galaxy was formed via quasi-continuous star formation over billions of years. However, an analysis of GALACTICNUCLEUS survey data indicates that > 80% of the mass of the stellar disc formed at least 8 Gyr ago and about 5% roughly 1 Gyr ago.
Aims: Our …
Investigating the turbulent hot gas in X-COP galaxy clusters
Pointecouteau, E.; Eckert, D.; Ettori, S. +3 more
Context. Turbulent processes at work in the intracluster medium perturb this environments, impacting its properties, displacing gas, and creating local density fluctuations that can be quantified via X-ray surface brightness fluctuation analyses. Improved knowledge of these phenomena would allow for a more accurate determination of the mass of gal…
Supercritical colliding wind binaries
Romero, Gustavo E.; Abaroa, Leandro; Sotomayor, Pablo
Context. Particle-accelerating colliding-wind binaries (PACWBs) are systems that are formed by two massive and hot stars and produce nonthermal radiation. The key elements of these systems are fast winds and the shocks that they create when they collide. Binaries with nonaccreting young pulsars have also been detected as nonthermal emitters, again…
NGC 2992: Interplay between the multiphase disc, wind, and radio bubbles
Fiore, F.; Massardi, M.; Lapi, A. +13 more
We present an analysis of the gas kinematics in NGC 2992 based on VLT/MUSE, ALMA, and VLA data. Our aim is to characterise the disc, the wind, and their interplay in the cold molecular and warm ionised phases. NGC 2992 is a changing-look Seyfert known to host both a nuclear ultrafast outflow (UFO), and an AGN-driven kiloparsec-scale ionised wind. …
Nearby galaxies in the LOFAR Two-metre Sky Survey. II. The magnetic field-gas relation
Beck, R.; Drabent, A.; Brüggen, M. +8 more
Context. Magnetic fields, which regulate stellar feedback and star formation in galaxies, are key to understanding galaxy evolution.
Aims: We probe the origin of magnetic fields in late-type galaxies, measuring magnetic field strengths and exploring whether magnetic fields are only passive constituents of the interstellar medium or whether, b…
Barium stars as tracers of s-process nucleosynthesis in AGB stars. II. Using machine learning techniques on 169 stars
Pereira, C. B.; Cseh, B.; Drake, N. A. +7 more
Context. Barium (Ba) stars are characterised by an abundance of heavy elements made by the slow neutron capture process (s-process). This peculiar observed signature is due to the mass transfer from a stellar companion, bound in a binary stellar system, to the Ba star observed today. The signature is created when the stellar companion is an asympt…
Redshifting galaxies from DESI to JWST CEERS: Correction of biases and uncertainties in quantifying morphology
Cheng, Cheng; Sun, Fengwu; Yu, Si-Yue +2 more
Observations of high-redshift galaxies with unprecedented detail have now been rendered possible with the James Webb Space Telescope (JWST). However, accurately quantifying their morphology remains uncertain due to potential biases and uncertainties. To address this issue, we used a sample of 1816 nearby DESI galaxies, with a stellar mass range of…
Frequency analysis of the first-overtone RR Lyrae stars based on Extended Aperture Photometry from K2 data
Plachy, E.; Molnár, L.; Netzel, H. +1 more
Context. Additional low-amplitude signals have been observed in many RR Lyrae stars separate from pulsations in radial modes. The most common of these are short-period signals forming a period ratio of around 0.60-0.65 with the first overtone and long-period signals forming a period ratio of around 0.68. The RR Lyrae stars may also exhibit quasi-p…
Supervised machine learning on Galactic filaments. Revealing the filamentary structure of the Galactic interstellar medium
Arzoumanian, D.; Zavagno, A.; Elia, D. +11 more
Context. Filaments are ubiquitous in the Galaxy, and they host star formation. Detecting them in a reliable way is therefore key towards our understanding of the star formation process.
Aims: We explore whether supervised machine learning can identify filamentary structures on the whole Galactic plane.
Methods: We used two versions of UN…