Search Publications
Interactions between large-scale radio structures and gas in a sample of optically selected type 2 quasars
Humphrey, A.; Storchi-Bergmann, T.; Bellocchi, E. +5 more
Context. The role of radio mode feedback in non radio-loud quasars needs to be explored in depth to determine its true importance. Its effects can be identified based on the evidence of interactions between the radio structures and the ambient ionised gas.
Aims: We investigate this interaction in a sample of 13 optically selected type 2 quasa…
Solar wind current sheets and deHoffmann-Teller analysis. First results from Solar Orbiter's DC electric field measurements
André, N.; Fedorov, A.; Lavraud, B. +25 more
Context. Solar Orbiter was launched on 10 February 2020 with the purpose of investigating solar and heliospheric physics using a payload of instruments designed for both remote and in situ studies. Similar to the recently launched Parker Solar Probe, and unlike earlier missions, Solar Orbiter carries instruments designed to measure low-frequency D…
Discovery of O stars in the tidal Magellanic Bridge. Stellar parameters, abundances, and feedback of the nearest metal-poor massive stars and their implication for the Magellanic System ecology
Hamann, W. -R.; Oskinova, L. M.; Ramachandran, V.
The Magellanic Bridge, stretching between the Small and the Large Magellanic Cloud (SMC and LMC), is the nearest tidally stripped intergalactic environment. The Bridge has a significantly low average metallicity of Z ≲ 0.1 Z⊙. Here we report the first discovery of O-type stars in the Magellanic Bridge. Three massive O stars were identif…
Outflows, envelopes, and disks as evolutionary indicators in Lupus young stellar objects
de Gregorio-Monsalvo, I.; Lopez, C.; Fernández-López, M. +4 more
Context. The Lupus star-forming complex includes some of the closest low-mass star-forming regions, and together they house objects that span evolutionary stages from prestellar to premain sequence.
Aims: By studying seven objects in the Lupus clouds from prestellar to protostellar stages, we aim to test if a coherence exists between commonly…
Evidence of the multi-thermal nature of spicular downflows. Impact on solar atmospheric heating
Joshi, Jayant; Martínez-Sykora, Juan; De Pontieu, Bart +4 more
Context. Spectroscopic observations of the emission lines formed in the solar transition region commonly show persistent downflows on the order of 10−15 km s−1. The cause of such downflows, however, is still not fully clear and has remained a matter of debate.
Aims: We aim to understand the cause of such downflows by studying the c…
Measuring chemical abundances with infrared nebular lines: HII-CHI-MISTRY-IR
Spinoglio, L.; Amorín, R.; Pérez-Montero, E. +2 more
We provide a new method for deriving heavy element abundances taking advantage of the unique suite of fine-structure lines in the mid- to far-infrared (IR) range. Using grids of photo-ionisation models that cover a wide range in O/H and N/O abundances and ionisation parameter, our code HII-CHI-MISTRY-IR (HCM-IR) provides model-based abundances bas…
The AMBRE Project: Origin and evolution of sulfur in the Milky Way
Recio-Blanco, A.; de Laverny, P.; Álvarez, M. A. +4 more
Context. Sulfur is a volatile chemical element that plays an important role in tracing the chemical evolution of the Milky Way and external galaxies. However, its nucleosynthesis origin and abundance variations in the Galaxy are still unclear because the number of available stellar sulfur abundance measurements is currently rather small.
Aims…
Activity of TRAPPIST-1 analog stars observed with TESS
Pál, András; Moór, Attila; Vida, Krisztián +2 more
As more exoplanets are being discovered around ultracool dwarfs, understanding their magnetic activity and the implications for habitability is of prime importance. To find stellar flares and photometric signatures related to starspots, continuous monitoring is necessary, which can be achieved with spaceborne observatories such as the Transiting E…
The outer disc in shambles: Blind detection of Monoceros and the ACS with Gaia's astrometric sample
Anders, F.; Antoja, T.; Ramos, P. +5 more
Context. The Gaia astrometric sample allows us to study the outermost Galactic disc, the halo, and their interface. It is precisely at the very edge of the disc where the effects of external perturbations are expected to be the most noticeable.
Aims: Our goal is to detect the kinematic substructure present in the halo and at the edge of the M…
Confirmation of two new Galactic bulge globular clusters: FSR 19 and FSR 25
Minniti, D.; Alonso-García, J.; Gómez, M. +1 more
Context. Globular clusters (GCs) in the Milky Way (MW) bulge are very difficult to study for the following reasons: (i) they suffer from the severe crowding and Galactic extinction, which are characteristic of these inner Galactic regions; (ii) they are more prone to the effects of dynamical processes. Therefore, they are relatively faint and diff…