Search Publications
The ultra-diffuse galaxy NGC 1052-DF2 with MUSE. II. The population of DF2: stars, clusters, and planetary nebulae
Emsellem, Eric; Müller, Oliver; Peng, Eric W. +13 more
NGC 1052-DF2, an ultra-diffuse galaxy (UDG), has been the subject of intense debate. Its alleged absence of dark matter, and the brightness and number excess of its globular clusters (GCs) at an initially assumed distance of 20 Mpc suggest a new formation channel for UDGs. We present the first systematic spectroscopic analysis of the stellar body …
Open clusters in APOGEE and GALAH. Combining Gaia and ground-based spectroscopic surveys
Jordi, C.; Casamiquela, L.; Cantat-Gaudin, T. +7 more
Context. Open clusters are ideal laboratories to investigate a variety of astrophysical topics, from the properties of the Galactic disc to stellar-evolution models. Knowing their metallicity and possibly detailed chemical abundances is therefore important. However, the number of systems with chemical abundances determined from high-resolution spe…
Exoplanet atmospheres with GIANO. II. Detection of molecular absorption in the dayside spectrum of HD 102195b
Sozzetti, A.; Giacobbe, P.; Bonomo, A. S. +4 more
Context. The study of exoplanetary atmospheres is key to understanding the differences between their physical, chemical, and dynamical processes. Until now, the bulk of atmospheric characterization analyses have been conducted on transiting planets. On a number of sufficiently bright targets, high-resolution spectroscopy (HRS) has also been succes…
A 5D view of the α Per, Pleiades, and Praesepe clusters
Smart, R. L.; Lodieu, N.; Pérez-Garrido, A. +1 more
Aims: Our scientific goal is to provide revised membership lists of the α Per, Pleiades, and Praesepe clusters exploiting the second data release of Gaia and produce five-dimensional maps (α, δ, π, µα cos δ, µδ) of these clusters.
Methods: We implemented the kinematic method combined with the statistical…
Ellerman bombs and UV bursts: transient events in chromospheric current sheets
Carlsson, M.; Pereira, T. M. D.; Hansteen, V. +3 more
Context. Ellerman bombs (EBs), observed in the photospheric wings of the Hα line, and UV bursts, observed in the transition region Si IV line, are both brightenings related to flux emergence regions and specifically to magnetic flux of opposite polarity that meet in the photosphere. These two reconnection-related phenomena, nominally formed far ap…
The Wolf-Rayet binaries of the nitrogen sequence in the Large Magellanic Cloud. Spectroscopy, orbital analysis, formation, and evolution
Hamann, W. -R.; Oskinova, L. M.; Sander, A. A. C. +11 more
Context. Massive Wolf-Rayet (WR) stars dominate the radiative and mechanical energy budget of galaxies and probe a critical phase in the evolution of massive stars prior to core collapse. It is not known whether core He-burning WR stars (classical WR; cWR) form predominantly through wind stripping (w-WR) or binary stripping (b-WR). Whereas spectro…
Enhanced cluster lensing models with measured galaxy kinematics
Rodighiero, G.; Grillo, C.; Rosati, P. +10 more
We present an improved determination of the total mass distribution of three massive clusters from the Cluster Lensing and Supernova Survey with Hubble and Hubble Frontier Fields, MACS J1206.2-0847 (z = 0.44), MACS J0416.1-2403 (z = 0.40), Abell S1063 (z = 0.35). We specifically reconstructed the sub-halo mass component with robust stellar kinemat…
Cold dust and stellar emissions in dust-rich galaxies observed with ALMA: a challenge for SED-fitting techniques
Ciesla, L.; Buat, V.; Boquien, M. +2 more
Context. Over the past few years the Atacama Large Millimeter Array (ALMA) has detected dust-rich galaxies whose cold dust emission is spatially disconnected from the ultraviolet (UV) rest-frame emission. This represents a challenge for modeling their spectral energy distributions (SED) with codes based on an energy budget between the stellar and …
The VIMOS Ultra-Deep Survey: evidence for AGN feedback in galaxies with CIII]-λ1908 Å emission 10.8 to 12.5 Gyr ago
Maccagni, D.; Cimatti, A.; Schaerer, D. +19 more
We analyze the CIII]-λ1908 Å emission properties in a sample of 3899 star-forming galaxies (SFGs) at 2 < z < 3.8 drawn from the VIMOS Ultra-Deep Survey (VUDS). We find a median rest-frame equivalent width EW(CIII]) = 2.0 ± 0.2 to 2.2 ± 0.2 Å for the whole SFG population at 2 < z < 3 and 3 < z < 4, respectively. About 24% of SFGs …
Structure, kinematics, and ages of the young stellar populations in the Orion region
Brown, A. G. A.; de Zeeuw, P. T.; Zari, E.
We present a study of the three dimensional structure, kinematics, and age distribution of the Orion OB association, based on the second data release of the Gaia satellite (Gaia DR2). Our goal is to obtain a complete picture of the star formation history of the Orion complex and to relate our findings to theories of sequential and triggered star f…