Search Publications
The Araucaria project: High-precision orbital parallax and masses of eclipsing binaries from infrared interferometry
Weber, M.; Kervella, P.; Tkachenko, A. +9 more
Context. The precise determinations of stellar mass at ≲1% provide important constraints on stellar evolution models. Accurate parallax measurements can also serve as independent benchmarks for the next Gaia data release.
Aims: We measured the masses and distance of binary systems with a precision level better than 1% using a fully geometrica…
The angular momentum of disc galaxies at z = 1
Fraternali, F.; Di Teodoro, E. M.; Oosterloo, T. +3 more
We investigate the relation between stellar mass (M⋆) and specific stellar angular momentum (j⋆), or "Fall relation", for a sample of 17 isolated, regularly rotating disc galaxies at z ∼ 1. All galaxies have rotation curves determined from Hα emission-line data; HST imaging in optical and infrared filters; and robust determin…
Multi-scale analysis of the Monoceros OB 1 star-forming region. II. Colliding filaments in the Monoceros OB1 molecular cloud
Sanhueza, Patricio; Soam, Archana; Doi, Yasuo +24 more
Context. We started a multi-scale analysis of star formation in G202.3+2.5, an intertwined filamentary sub-region of the Monoceros OB1 molecular complex, in order to provide observational constraints on current theories and models that attempt to explain star formation globally. In the first paper (Paper I), we examined the distributions of dense …
Exploring the R CrA environment with SPHERE. Discovery of a new stellar companion
Lodato, G.; Barbieri, M.; Henning, T. +39 more
Aims: R Coronae Australis (R CrA) is the brightest star of the Coronet nebula of the Corona Australis (CrA) star forming region. This star is very red in color, probably due to dust absorption, and is strongly variable. High-contrast instruments allow for an unprecedented direct exploration of the immediate circumstellar environment of this s…
A stellar census in globular clusters with MUSE: multiple populations chemistry in NGC 2808
Dreizler, S.; Bastian, N.; Latour, M. +8 more
Context. Galactic globular clusters (GCs) are now known to host multiple populations displaying particular abundance variations. The different populations within a GC can be well distinguished following their position in the pseudo two-colors diagrams, also referred to as "chromosome maps". These maps are constructed using optical and near-UV phot…
Simulating MOS science on the ELT: Lyα forest tomography
Kaper, L.; Yang, Y.; Gendron, E. +14 more
Mapping the large-scale structure through cosmic time has numerous applications in studies of cosmology and galaxy evolution. At z ≳ 2, the structure can be traced by the neutral intergalactic medium (IGM) by way of observing the Lyα forest towards densely sampled lines of sight of bright background sources, such as quasars and star-forming galaxi…
SDSS-IV/SPIDERS: A catalogue of X-ray selected AGN properties. Spectral properties and black hole mass estimates for SPIDERS SDSS DR14 type 1 AGN
Salvato, M.; Schulze, A.; Nandra, K. +7 more
This work presents the catalogue of optical spectral properties for all X-ray selected SPIDERS active galactic nuclei (AGN) up to SDSS DR14. SPIDERS (SPectroscopic IDentification of eROSITA Sources) is an SDSS-IV programme that is currently conducting optical spectroscopy of the counterparts to the X-ray selected sources detected in the ROSAT all-…
The Most Massive galaxy Clusters (M2C) across cosmic time: link between radial total mass distribution and dynamical state
Arnaud, M.; Pratt, G. W.; Bartalucci, I. +2 more
We study the dynamical state and the integrated total mass profiles of 75 massive (M500 > 5 × 1014 M⊙) Sunyaev-Zeldovich(SZ)-selected clusters at 0.08 < z < 1.1. The sample is built from the Planck catalogue, with the addition of four SPT clusters at z > 0.9. Using XMM-Newton imaging observations, we ch…
Weak-lensing shear measurement with machine learning. Teaching artificial neural networks about feature noise
Schrabback, T.; Hildebrandt, H.; Courbin, F. +3 more
Cosmic shear, that is weak gravitational lensing by the large-scale matter structure of the Universe, is a primary cosmological probe for several present and upcoming surveys investigating dark matter and dark energy, such as Euclid or WFIRST. The probe requires an extremely accurate measurement of the shapes of millions of galaxies based on imagi…
Linking surface morphology, composition, and activity on the nucleus of 67P/Churyumov-Gerasimenko
Lamy, P. L.; Bertaux, J. -L.; Shi, X. +37 more
Aims: The Rosetta space probe accompanied comet 67P/Churyumov-Gerasimenko for more than two years, obtaining an unprecedented amount of unique data of the comet nucleus and inner coma. This has enabled us to study its activity almost continuously from 4 au inbound to 3.6 au outbound, including the perihelion passage at 1.24 au. This work focu…