Search Publications
Catalogue of dual-field interferometric binary calibrators
Lutz, D.; Förster Schreiber, N. M.; Genzel, R. +96 more
Context. Dual-field interferometric observations with VLTI/GRAVITY sometimes require the use of a binary calibrator. This is a binary star whose individual components remain unresolved by the interferometer, with a separation between 400 and 2000 mas for observations with the Unit Telescopes (UTs), or 1200-3000 mas for the Auxiliary Telescopes (AT…
Gas-phase metallicity for the Seyfert galaxy NGC 7130
Lehmer, B. D.; Marconi, A.; Knapen, J. H. +2 more
Metallicity measurements in galaxies can provide valuable clues about galaxy evolution. One of the mechanisms postulated for metallicity redistribution in galaxies is gas flows induced by active galactic nuclei (AGNs), but the details of this process remain elusive. We report the discovery of a positive radial gradient in the gas-phase metallicity…
An optically dark merging system at z ∼ 6 detected by JWST
Rodighiero, G.; Vulcani, B.; Castellano, M. +16 more
Context. Near- to mid-infrared observations (from Spitzer and JWST) have revealed a hidden population of galaxies at redshift z = 3 ‑ 6 called optically dark objects, which are believed to be massive and dusty star-formers. They contribute substantially to the cosmic star-formation rate (SFR) density at z ∼ 4 ‑ 5 (up to 30 ‑ 40%). Aims. While opti…
A baseline on the relation between chemical patterns and the birth stellar cluster
Jofré, P.; Signor, T.; Martí, L. +1 more
Context. The chemical composition of a star's atmosphere reflects the chemical composition of its birth environment. Therefore, it should be feasible to recognize stars born together that have scattered throughout the galaxy, solely based on their chemistry. This concept, known as "strong chemical tagging", is a major objective of spectroscopic st…
VELOcities of CEpheids (VELOCE): II. Systematic search for spectroscopic binary cepheids
Anderson, Richard I.; Szabados, László; Mowlavi, Nami +4 more
Classical Cepheids provide valuable insights into the evolution of stellar multiplicity among intermediate-mass stars. Here, we present a systematic investigation of single-lined spectroscopic binaries (SB1s) based on high-precision velocities measured by the VELOcities of CEpheids (VELOCE) project. We detected 76 (29%) SB1 systems among the 258 M…
The YMCA (Yes, Magellanic Clouds Again) survey: Probing the outer regions of the Magellanic system with VST
Cignoni, M.; Tosi, M.; Ripepi, V. +9 more
Context. The Magellanic Clouds (MCs) are the Milky Way's most massive dwarf satellites. As they also represent the closest pair of galaxies in an ongoing tidal interaction while simultaneously infalling into the Milky Way halo, they provide a unique opportunity to study in detail an ongoing three-body encounter. Aims. We present the YMCA (Yes, Mag…
Strong Balmer break objects at z ∼ 7–10 uncovered with JWST
Schaerer, D.; Marques-Chaves, R.; Oesch, P. A. +4 more
We report the discovery of robust spectroscopically confirmed Balmer break (BB) galaxies and candidates, with secure spectroscopic redshifts 7.1 ≤ z ≤ 9.6, from publicly available James Webb Space Telescope (JWST) extra-galactic photometric and spectroscopic surveys. To achieve this, we used dedicated filters probing the BB and inspected the objec…
Magnetic fields in the outskirts of PSZ2 G096.88+24.18 from a depolarization analysis of radio relics
Vazza, F.; van Weeren, R. J.; Bonafede, A. +4 more
Context. Radio relics are diffuse, non-thermal radio sources present in a number of merging galaxy clusters. They are characterized by elongated arc-like shapes and highly polarized emission (up to ∼60%) at gigahertz frequencies, and are expected to trace shock waves in the cluster outskirts induced by galaxy cluster mergers. Their polarized emiss…
A new method of measuring Forbush decreases
Vršnak, B.; Dumbović, M.; Heber, B. +2 more
Context. Forbush decreases (FDs) are short-term depressions in the galactic cosmic ray (GCR) flux and one of the common signatures of coronal mass ejections (CMEs) in the heliosphere. They often show a two-step profile, the second one associated with the CME's magnetic structure. This second step can be described by the recently developed analytic…
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Westerlund 1 and 2 Open Clusters Survey
Umana, G.; Bayo, A.; Robberto, M. +48 more
Context. With a mass exceeding several 104 M⊙ and a rich and dense population of massive stars, supermassive young star clusters represent the most massive star-forming environment that is dominated by the feedback from massive stars and gravitational interactions among stars.
Aims: In this paper we present the Extended …