Search Publications
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…
Global survey of star clusters in the Milky Way. VII. Tidal parameters and mass function
Kovaleva, D. A.; Piskunov, A. E.; Just, A. +2 more
Aims: We built Galactic open star cluster mass functions (CMFs) for different age sub-samples and spatial locations in the wider solar neighbourhood. Here, we present a simple cluster formation and evolution model to reproduce the main features of the CMFs.
Methods: We used an unbiased working sample of 2227 clusters of the Milky Way Sta…
Ultracool dwarfs in Gaia DR3
Recio-Blanco, A.; de Laverny, P.; Bailer-Jones, C. A. L. +36 more
Context. Previous Gaia data releases offered the opportunity to uncover ultracool dwarfs (UCDs) through astrometric, rather than purely photometric, selection. The most recent, the third data release (DR3), offers in addition the opportunity to use low-resolution spectra to refine and widen the selection.
Aims: In this work we use the Gaia DR…
How the origin of stars in the Galaxy impacts the composition of planetary building blocks
Diakite, S.; Lagarde, N.; Guilbert-Lepoutre, A. +2 more
Context. Our Galaxy is composed of different stellar populations with varying chemical abundances, which are thought to imprint the composition of planet building blocks (PBBs). As such, the properties of stars should affect the properties of planets and small bodies formed in their systems. In this context, high-resolution spectroscopic surveys o…
Compact jets dominate the continuum emission in low-luminosity active galactic nuclei
Fernández-Ontiveros, J. A.; Prieto, A.; López-López, X.
Low-luminosity active galactic nuclei (LLAGN) are special among their kind due to the profound structural changes that the central engine experiences at low accretion rates (≲ 10−3 in Eddington units). The disappearance of the accretion disc - the blue bump - leaves behind a faint optical nuclear continuum whose nature has been largely …
Observations of neutral carbon in 29 high-z lensed dusty star-forming galaxies and the comparison of gas mass tracers
Weiss, A.; Greve, T. R.; Vieira, J. D. +10 more
Context. The nature and evolution of high-redshift dusty star-forming galaxies (high-z DSFGs) remain open questions. Their massive gas reservoirs play an important role in driving the intense star formation rates hosted in these galaxies.
Aims: Our aim is to estimate the molecular gas content of high-z DSFGs by using various gas mass tracers,…