Search Publications
HR 6819 is a binary system with no black hole. Revisiting the source with infrared interferometry and optical integral field spectroscopy
Rivinius, Th.; Baade, D.; Shenar, T. +16 more
Context. Two scenarios have been proposed to match the existing observational constraints of the object HR 6819. The system could consist of a close inner B-type giant plus a black hole (BH) binary with an additional Be companion in a wide orbit. Alternatively, it could be a binary composed of a stripped B star and a Be star in a close orbit. Eith…
LoTSS jellyfish galaxies. III. The first identification of jellyfish galaxies in the Perseus cluster
Botteon, A.; van Weeren, R. J.; Ignesti, A. +4 more
In this paper we report the first identification of jellyfish galaxies in the Perseus cluster (Abell 426). We identified four jellyfish galaxies (LEDA 2191078, MCG +07-07-070, UGC 2654, UGC 2665) within the central 2° ×2° (2.6 Mpc × 2.6 Mpc) of Perseus based on the presence of one-sided radio continuum tails that were detected at 144 MHz by the LO…
Non-LTE abundance corrections for late-type stars from 2000 Å to 3 µm. I. Na, Mg, and Al
Sneden, C.; Lind, K.; Barklem, P. S. +6 more
Context. It is well known that cool star atmospheres depart from local thermodynamic equilibrium (LTE). Making an accurate abundance determination requires taking those effects into account, but the necessary non-LTE (hereafter NLTE) calculations are often lacking.
Aims: Our goal is to provide detailed estimates of NLTE effects for FGK type s…
Survey of Orion Disks with ALMA (SODA). I. Cloud-level demographics of 873 protoplanetary disks
van Dishoeck, E. F.; Portegies Zwart, S.; Hacar, A. +2 more
Context. Surveys of protoplanetary disks in nearby star-forming regions (SFRs) have provided important information on their demographics. However, due to their sample sizes, these surveys cannot be used to study how disk properties vary with the environment.
Aims: We conduct a survey of the unresolved millimeter continuum emission of 873 prot…
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…