Search Publications
3D kinematics and age distribution of the open cluster population
Castro-Ginard, A.; Jordi, C.; Casamiquela, L. +14 more
Context. Open clusters (OCs) trace the evolution of the Galactic disc with great accuracy. Gaia and large ground-based spectroscopic surveys make it possible to determine their properties and study their kinematics with unprecedented precision.
Aims: We study the kinematical behaviour of the OC population over time. We take advantage of the l…
Extended stellar systems in the solar neighborhood. V. Discovery of coronae of nearby star clusters
Meingast, Stefan; Alves, João; Rottensteiner, Alena
We present a novel view on the morphology and dynamical state of ten prominent, nearby (≤500 pc), and young (∼30-300 Myr) open star clusters with Gaia DR2: α Per, Blanco 1, IC 2602, IC 2391, Messier 39, NGC 2451A, NGC 2516, NGC 2547, Platais 9, and the Pleiades. We introduce a pioneering member-identification method that is informed by cluster bul…
Gaia Early Data Release 3. Acceleration of the Solar System from Gaia astrometry
Prusti, T.; Mazeh, T.; Zucker, S. +414 more
Context. Gaia Early Data Release 3 (Gaia EDR3) provides accurate astrometry for about 1.6 million compact (QSO-like) extragalactic sources, 1.2 million of which have the best-quality five-parameter astrometric solutions.
Aims: The proper motions of QSO-like sources are used to reveal a systematic pattern due to the acceleration of the solar s…
The LOFAR Two-meter Sky Survey: Deep Fields Data Release 1. III. Host-galaxy identifications and value added catalogues
Bondi, M.; Prandoni, I.; Bowler, R. A. A. +40 more
We present the source associations, cross-identifications, and multi-wavelength properties of the faint radio source population detected in the deep tier of the LOFAR Two Metre Sky Survey (LoTSS): the LoTSS Deep Fields. The first LoTSS Deep Fields data release consists of deep radio imaging at 150 MHz of the ELAIS-N1, Lockman Hole, and Boötes fiel…
Improving the open cluster census. I. Comparison of clustering algorithms applied to Gaia DR2 data
Reffert, Sabine; Hunt, Emily L.
Context. The census of open clusters in the Milky Way is in a never-before seen state of flux. Recent works have reported hundreds of new open clusters thanks to the incredible astrometric quality of the Gaia satellite, but other works have also reported that many open clusters discovered in the pre Gaia era may be associations.
Aims: We aim …
The ART-XC telescope on board the SRG observatory
Sunyaev, R.; Krivonos, R.; Sazonov, S. +59 more
Astronomical Roentgen Telescope - X-ray Concentrator (ART-XC) is the hard X-ray instrument with grazing incidence imaging optics on board the Spektr-Roentgen-Gamma (SRG) observatory. The SRG observatory is the flagship astrophysical mission of the Russian Federal Space Program, which was successively launched into orbit around the second Lagrangia…
Cosmological implications of the anisotropy of ten galaxy cluster scaling relations
Lovisari, L.; Pacaud, F.; Ramos-Ceja, M. E. +5 more
The hypothesis that the late Universe is isotropic and homogeneous is adopted by most cosmological studies, including studies of galaxy clusters. The cosmic expansion rate H0 is thought to be spatially constant, while bulk flows are often presumed to be negligible compared to the Hubble expansion, even at local scales. The effects of bu…
A nearby galaxy perspective on dust evolution. Scaling relations and constraints on the dust build-up in galaxies with the DustPedia and DGS samples
De Looze, Ilse; Baes, Maarten; Fritz, Jacopo +13 more
Context. The efficiency of the different processes responsible for the evolution of interstellar dust on the scale of a galaxy are, to date, very uncertain, spanning several orders of magnitude in the literature. Yet, precise knowledge of the grain properties is key to addressing numerous open questions about the physics of the interstellar medium…
Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample. I. A catalogue of homogeneous chromospheric activity
Recio-Blanco, A.; de Laverny, P.; Monteiro, M. J. P. F. G. +9 more
Aims: The main objective of this project is to characterise chromospheric activity of FGK stars from the HARPS archive. We start, in this first paper, by presenting a catalogue of homogeneously determined chromospheric emission (CE), stellar atmospheric parameters, and ages for 1674 FGK main sequence (MS), subgiant, and giant stars. The analy…
Internal calibration of Gaia BP/RP low-resolution spectra
Jordi, C.; Evans, D. W.; van Leeuwen, F. +6 more
Context. The full third Gaia data release will provide, for the first time, the calibrated spectra obtained with the blue and red Gaia slitless spectrophotometers (BP and RP, respectively). Gaia is a very complex mission and cannot be considered as a single instrument, but rather as many instruments. The two lines of sight with wide fields of view…