Search Publications
HARPS-N high spectral resolution observations of Cepheids. II. The impact of the surface-brightness color relation on the Baade-Wesselink projection factor of η Aql
Poretti, E.; Rainer, M.; Kervella, P. +16 more
Context. The Baade-Wesselink (BW) method of distance determination of Cepheids is used to calibrate the distance scale. Various versions of this method are mainly based on interferometry and/or the surface-brightness color relation (SBCR).
Aims: We quantify the impact of the SBCR, its slope, and its zero point on the projection factor. This q…
The galaxy mass-size relation in CARLA clusters and proto-clusters at 1.4 < z < 2.8: Larger cluster galaxy sizes
Noirot, Gaël; Gonzalez, Anthony H.; Stern, Daniel +12 more
We study the galaxy mass-size relation in 15 spectroscopically confirmed clusters at 1.4 < z < 2.8 from the CARLA survey. Our clusters span a total stellar mass in the range 11.3 < log(M*c/M⊙) < 12.6 (with an approximate halo mass in the range 13.5 ≲ log(Mhc/M⊙) ≲ 14.5).…
Galactic runaway O and Be stars found using Gaia DR3
Paredes, J. M.; Ribó, M.; Carretero-Castrillo, M.
Context. A relevant fraction of massive stars are runaway stars. These stars move with a significant peculiar velocity with respect to their environment.
Aims: We aim to discover and characterize the population of massive and early-type runaway stars in the GOSC and BeSS catalogs using Gaia DR3 astrometric data.
Methods: We present a two…
Temporal variation of the photometric magnetic activity for the Sun and Kepler solar-like stars
García, R. A.; Mathur, S.; Jiménez, A. +9 more
Context. The photometric time series of solar-like stars can exhibit rotational modulation, that is, brightness variations due to active regions co-rotating with the stellar surface. These signatures allow us to constrain properties of stellar rotation and magnetic activity.
Aims: In this work we investigate the behavior, particularly the var…
Streamlined lensed quasar identification in multiband images via ensemble networks
Eilers, Anna-Christina; Yue, Minghao; Suyu, Sherry H. +6 more
Quasars experiencing strong lensing offer unique viewpoints on subjects related to the cosmic expansion rate, the dark matter profile within the foreground deflectors, and the quasar host galaxies. Unfortunately, identifying them in astronomical images is challenging since they are overwhelmed by the abundance of non-lenses. To address this, we ha…
Impact of the Galactic bar on tidal streams within the Galactic disc. The case of the tidal stream of the Hyades
Laporte, Chervin F. P.; de Laverny, Patrick; Famaey, Benoit +5 more
Tidal streams of disrupted clusters are powerful probes of the gravitational potential of the Galaxy and they are routinely detected in the stellar halo of the Milky Way. It was recently shown that tidal streams of open clusters can now also be detected within the Milky Way disc. In this work, we highlight the fact that disc tidal streams also pro…
The formation history of our Galaxy's nuclear stellar disc constrained from HST observations of the Quintuplet field
Rich, R. M.; Lu, J.; Nogueras-Lara, F. +9 more
Context. Until recently it was thought that the nuclear stellar disc at the centre of our Galaxy was formed via quasi-continuous star formation over billions of years. However, an analysis of GALACTICNUCLEUS survey data indicates that > 80% of the mass of the stellar disc formed at least 8 Gyr ago and about 5% roughly 1 Gyr ago.
Aims: Our …
Investigating the turbulent hot gas in X-COP galaxy clusters
Pointecouteau, E.; Eckert, D.; Ettori, S. +3 more
Context. Turbulent processes at work in the intracluster medium perturb this environments, impacting its properties, displacing gas, and creating local density fluctuations that can be quantified via X-ray surface brightness fluctuation analyses. Improved knowledge of these phenomena would allow for a more accurate determination of the mass of gal…
Supercritical colliding wind binaries
Romero, Gustavo E.; Abaroa, Leandro; Sotomayor, Pablo
Context. Particle-accelerating colliding-wind binaries (PACWBs) are systems that are formed by two massive and hot stars and produce nonthermal radiation. The key elements of these systems are fast winds and the shocks that they create when they collide. Binaries with nonaccreting young pulsars have also been detected as nonthermal emitters, again…
NGC 2992: Interplay between the multiphase disc, wind, and radio bubbles
Fiore, F.; Massardi, M.; Lapi, A. +13 more
We present an analysis of the gas kinematics in NGC 2992 based on VLT/MUSE, ALMA, and VLA data. Our aim is to characterise the disc, the wind, and their interplay in the cold molecular and warm ionised phases. NGC 2992 is a changing-look Seyfert known to host both a nuclear ultrafast outflow (UFO), and an AGN-driven kiloparsec-scale ionised wind. …