Search Publications
The XXL survey. XLVI. Forward cosmological analysis of the C1 cluster sample
Umetsu, Keiichi; Gastaldello, Fabio; Sereno, Mauro +15 more
Context. We present the forward cosmological analysis of an XMM-selected sample of galaxy clusters out to a redshift of unity. We derive mass-observable relations in a self-consistent manner using the sample alone. Special care is given to the modelling of selection effects.
Aims: Following our previous 2018 study based on the dn/dz quantity …
The Sagittarius stream in Gaia Early Data Release 3 and the origin of the bifurcations
Antoja, T.; Ramos, P.; Arentsen, A. +6 more
Context. The Sagittarius dwarf spheroidal (Sgr) is a dissolving galaxy being tidally disrupted by the Milky Way (MW). Its stellar stream still poses serious modelling challenges, which hinders our ability to use it effectively as a prospective probe of the MW gravitational potential at large radii.
Aims: Our goal is to construct the largest a…
Lithium depletion boundary, stellar associations, and Gaia
Montesinos, B.; Bayo, A.; Huélamo, N. +9 more
Context. Stellar ages are key to improving our understanding of different astrophysical phenomena. However, many techniques to estimate stellar ages are highly model-dependent. The lithium depletion boundary (LDB), based on the presence or absence of lithium in low-mass stars, can be used to derive ages in stellar associations of between 20 and 50…
The magnetic drivers of campfires seen by the Polarimetric and Helioseismic Imager (PHI) on Solar Orbiter
Schmidt, W.; Woch, J.; Peter, H. +56 more
Context. The Extreme Ultraviolet Imager (EUI) on board the Solar Orbiter (SO) spacecraft observed small extreme ultraviolet (EUV) bursts, termed campfires, that have been proposed to be brightenings near the apexes of low-lying loops in the quiet-Sun atmosphere. The underlying magnetic processes driving these campfires are not understood.
Aim…
Warm molecular and ionized gas kinematics in the type-2 quasar J0945+1737
Alexander, D. M.; Lapi, A.; Brusa, M. +11 more
We analyse Near-Infrared Integral Field Spectrograph (NIFS) observations of the type-2 quasar (QSO2) SDSS J094521.33+173753.2 to investigate its warm molecular and ionized gas kinematics. This QSO2 has a bolometric luminosity of 1045.7 erg s−1 and a redshift of z = 0.128. The K-band spectra provided by NIFS cover a range of 1…
Kinematic properties of white dwarfs. Galactic orbital parameters and age-velocity dispersion relation
Rebassa-Mansergas, Alberto; Raddi, Roberto; Torres, Santiago +9 more
Context. Kinematic and chemical tagging of stellar populations have both revealed much information on the past and recent history of the Milky Way, including its formation history, merger events, and mixing of populations across the Galactic disk and halo.
Aims: We present the first detailed 3D kinematic analysis of a sample of 3133 white dwa…
The CARMENES search for exoplanets around M dwarfs. Benchmarking the impact of activity in high-precision radial velocity measurements
Amado, P. J.; Caballero, J. A.; Czesla, S. +17 more
Context. Current exoplanet surveys using the radial velocity (RV) technique are targeting M dwarfs because any habitable zone terrestrial-mass planets will induce a high RV and orbit on shorter periods than for more massive stars. One of the main caveats is that M dwarfs show a wide range of activity levels from inactive to very active, which can …
Dark matter in galaxy clusters: Parametric strong-lensing approach
Jullo, Eric; Limousin, Marceau; Beauchesne, Benjamin
We present a parametric strong-lensing analysis of three massive galaxy clusters for which Hubble Space Telescope imaging is available, as well as spectroscopy of multiply imaged systems and galaxy cluster members. Our aim is to probe the inner shape of dark matter haloes, in particular the existence of a core. We adopted the following working hyp…
The chemical composition of globular clusters in the Local Group
Larsen, S. S.; Strader, J.; Bergemann, M. +5 more
We present detailed chemical abundance measurements for 45 globular clusters (GCs) associated with galaxies in (and, in one case, beyond) the Local Group. The measurements are based on new high-resolution integrated-light spectra of GCs in the galaxies NGC 185, NGC 205, M 31, M 33, and NGC 2403, combined with reanalysis of previously published obs…
Stellar wind properties of the nearly complete sample of O stars in the low metallicity young star cluster NGC 346 in the SMC galaxy
Hamann, W. -R.; Gallagher, J. S.; Prinja, R. K. +9 more
Context. Massive stars are among the main cosmic engines driving the evolution of star-forming galaxies. Their powerful ionising radiation and stellar winds inject a large amount of energy in the interstellar medium. Furthermore, mass-loss (Ṁ) through radiatively driven winds plays a key role in the evolution of massive stars. Even so, the wind ma…