Search Publications
Jurassic: A chemically anomalous structure in the Galactic halo
Beers, Timothy C.; Minniti, Dante; Fernández-Trincado, José G.
Detailed elemental-abundance patterns of giant stars in the Galactic halo measured by the Apache Point Observatory Galactic Evolution Experiment (APOGEE-2) have revealed the existence of a unique and significant stellar subpopulation of silicon-enhanced ([Si/Fe] ≳ +0.5) metal-poor stars, spanning a wide range of metallicities (-1.5 ≲ [Fe/H] ≲ -0.8…
The role of Galactic H II regions in the formation of filaments. High-resolution submilimeter imaging of RCW 120 with ArTéMiS
Roussel, H.; André, Ph.; Arzoumanian, D. +13 more
Context. Massive stars and their associated ionized (H II) regions could play a key role in the formation and evolution of filaments that host star formation. However, the properties of filaments that interact with H II regions are still poorly known.
Aims: To investigate the impact of H II regions on the formation of filaments, we imaged the…
The Forgotten Quadrant Survey. 12CO and 13CO (1-0) survey of the Galactic plane in the range 220° <l <240° -2.°5 < b < 0°
Rygl, K. L. J.; Testi, L.; Benedettini, M. +12 more
Aims: We present the Forgotten Quadrant Survey (FQS), an ESO large project that used the 12 m antenna of the Arizona Radio Observatory to map the Galactic plane in the range 220° < l < 240° and -2.°5 < b < 0°, both in 12CO (1-0) and 13CO (1-0), at a spectral resolution of 0.65 km s-1 and 0.26 km s<…
A search for the origin of the interstellar comet 2I/Borisov
Bailer-Jones, Coryn A. L.; Meech, Karen J.; Ye, Quanzhi +2 more
The discovery of the second interstellar object 2I/Borisov on 2019 August 30 raises the question of whether it was ejected recently from a nearby stellar system. Here we compute the asymptotic incoming trajectory of 2I/Borisov, based on both recent and pre-discovery data extending back to December 2018, using a range of force models that account f…
ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT). I. CO, CS, CN, and H2CO around DG Tau B
Podio, L.; Bacciotti, F.; Fedele, D. +7 more
The chemical composition of planets is determined by the distribution of the various molecular species in the protoplanetary disk at the time of their formation. To date, only a handful of disks have been imaged in multiple spectral lines with high spatial resolution. As part of a small campaign devoted to the chemical characterization of disk-out…
The influence of NLTE effects in Fe I lines on an inverted atmosphere. I. 6301 Å and 6302 Å lines formed in 1D NLTE
Solanki, S. K.; van Noort, M.; Smitha, H. N. +1 more
Context. Ultraviolet overionisation of iron atoms in the solar atmosphere leads to deviations in their level populations based on Saha-Boltzmann statistics. This causes their line profiles to form in non-local thermodynamic equilibrium (NLTE) conditions. When inverting such profiles to determine atmospheric parameters, the NLTE effects are often n…
Stellar Population Astrophysics (SPA) with TNG. The old open clusters Collinder 350, Gulliver 51, NGC 7044, and Ruprecht 171
Vallenari, A.; Sordo, R.; Bragaglia, A. +9 more
Context. Open clusters are excellent tracers of the chemical evolution of the Galactic disc. The spatial distribution of their elemental abundances, through the analysis of high-quality and high-resolution spectra, provides insight into the chemical evolution and mechanisms of element nucleosynthesis in regions characterised by different condition…
High-resolution, 3D radiative transfer modelling. II. The early-type spiral galaxy M 81
Clark, Christopher J. R.; Mosenkov, Aleksandr V.; De Looze, Ilse +14 more
Context. Interstellar dust absorbs stellar light very efficiently, thus shaping the energy output of galaxies. Studying the impact of different stellar populations on the dust heating continues to be a challenge because it requires decoupling the relative geometry of stars and dust and also involves complex processes such as scattering and non-loc…
Spirals inside the millimeter cavity of transition disk SR 21
Ménard, F.; Henning, T.; Ginski, C. +22 more
Context. Hydrodynamical simulations of planet-disk interactions suggest that planets may be responsible for a number of the substructures frequently observed in disks in both scattered light and dust thermal emission. Despite the ubiquity of these features, direct evidence of planets embedded in disks and of the specific interaction features like …
Constraining the masses of high-redshift clusters with weak lensing: Revised shape calibration testing for the impact of stronger shears and increased blending
Gladders, M. D.; Schrabback, T.; Hernández-Martín, B. +7 more
Weak lensing measurements suffer from well-known shear estimation biases, which can be partially corrected for with the use of image simulations. In this work we present an analysis of simulated images that mimic Hubble Space Telescope/Advance Camera for Surveys observations of high-redshift galaxy clusters, including cluster specific issues such …