Search Publications
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 …
Binary neutron star merger offsets from their host galaxies: GW 170817 as a case study
Lyman, J. D.; Levan, A. J.; Chrimes, A. A. +2 more
Aims. The locations of binary neutron star (BNS) mergers within their host galaxies encode the systemic kicks that these systems received in the supernova aftermath. We investigate how the galactic potential and the systemic kicks shape the offset distribution of BNS mergers with a case study of GW 170817 and its host NGC 4993. Methods. We derived…
Fractionation in young cores: Direct determinations of nitrogen and carbon fractionation in HCN
Caselli, P.; Jensen, S. S.; Spezzano, S. +4 more
Context. Nitrogen fractionation is a powerful tracer of the chemical evolution during star and planet formation. It requires robust determinations of the nitrogen fractionation across different evolutionary stages.
Aims: We aim to determine the 14N/15N and 12C/13C ratios for HCN in six starless and …