Search Publications
COSMOS2020: Manifold learning to estimate physical parameters in large galaxy surveys
Sanders, D. B.; Ilbert, O.; Moneti, A. +16 more
We present a novel method for estimating galaxy physical properties from spectral energy distributions (SEDs) as an alternative to template fitting techniques and based on self-organizing maps (SOMs) to learn the high-dimensional manifold of a photometric galaxy catalog. The method has previously been tested with hydrodynamical simulations in Davi…
Spatially resolved star-formation relations of dense molecular gas in NGC 1068
Colina, L.; García-Burillo, S.; Fuente, A. +5 more
Context. According to the current understanding of star formation (SF), the regulation of this phenomenon in galaxy disks reflects a complex balance between processes that operate in molecular gas on local cloud scales as well as on global disk scales.
Aims: We analyse the influence of the dynamical environment on the SF relations of the dens…
ESPRESSO observations of HE 0107−5240 and other CEMP-no stars with [Fe/H] ≤ -4.5
Rebolo, R.; Zapatero Osorio, M. R.; Allende Prieto, C. +22 more
Context. HE 0107−5240 is a hyper metal-poor star with [Fe/H] = −5.39, one of the lowest-metallicity stars known. Its stellar atmosphere is enhanced in carbon, with [C/Fe] = +4.0, without a detectable presence of neutron-capture elements. Therefore, it belongs to the carbon-enhanced metal-poor (CEMP−no) group, along with the majority of the most me…
Tidally induced spiral arm wraps encoded in phase space
Anders, F.; Antoja, T.; Bernet, M. +3 more
Context. The impact of Sagittarius and other satellite galaxies such as the Large Magellanic Cloud on our Galaxy and in particular its disc is gradually being disclosed. Simulations tailored to the interaction of the Milky Way (MW) and Sagittarius show rings and spiral arms appearing in the Galaxy disc. However, spiral arms can also be induced by …
Compact molecular gas emission in local LIRGs among low- and high-z galaxies
Rigopoulou, D.; Colina, L.; Valentino, F. +12 more
We present new CO(2-1) observations of a representative sample of 24 local (z < 0.02) luminous infrared galaxies (LIRGs) at high spatial resolution (< 100 pc) from the Atacama Large Millimeter/submillimeter Array (ALMA). Our LIRGs lie above the main sequence (MS), with typical stellar masses in the range 1010-1011 M
The Milky Way's middle-aged inner ring
Clarke, Jonathan P.; Wylie, Shola M.; Gerhard, Ortwin E.
Aims: We investigate the metallicity, age, and orbital anatomy of the inner Milky Way, specifically focussing on the outer bar region.
Methods: We integrated a sample of APOGEE DR16 inner Galaxy stars in a state of the art bar-bulge potential with a slow pattern speed and investigated the link between the resulting orbits and their [Fe/H…
The Solar ALMA Science Archive (SALSA). First release, SALAT, and FITS header standard
Mohan, Atul; Wedemeyer, Sven; Jafarzadeh, Shahin +5 more
In December 2016, the Atacama Large Millimeter/submillimeter Array (ALMA) carried out the first regular observations of the Sun. These early observations and the reduction of the respective data posed a challenge due to the novelty and complexity of observing the Sun with ALMA. The difficulties with producing science-ready, time-resolved imaging p…
Relationship between Ca and Hα chromospheric emission in F-G-K stars: Indication of stellar filaments?
Kretzschmar, M.; Meunier, N.; Delfosse, X. +2 more
Context. Different relationships between the Hα and Ca II chromospheric emissions have been reported in solar-type stars. In particular, the time-series of emissions in these two lines are clearly anti-correlated for a few percent of the stars, contrary to what is observed on the Sun.
Aims: Our objective is to characterise these relationships…
The eROSITA Final Equatorial-Depth Survey (eFEDS). Variability catalogue and multi-epoch comparison
Schmitt, J. H. M. M.; Georgakakis, A.; Salvato, M. +10 more
The 140-square-degrees Final Equatorial-Depth Survey (eFEDS) field, observed with the extended ROentgen Survey with an Imaging Telescope Array (eROSITA) on board the Spectrum-Roentgen-Gamma mission, provides a first look at the variable eROSITA sky. We analysed the intrinsic X-ray variability of the eFEDS sources and provide X-ray light curves and…
Bulge formation inside quiescent lopsided stellar disks: Connecting accretion, star formation, and morphological transformation in a z ∼ 3 galaxy group
Daddi, Emanuele; Pety, Jérôme; Tan, Qinghua +10 more
We present well-resolved near-IR and submillimeter analysis of the three highly star-forming massive (> 1011 M⊙) galaxies within the core of the RO-1001 galaxy group at z = 2.91. Each of them displays kpc scale compact starbursting cores with properties consistent with forming galaxy bulges, embedded at the center of exten…