Search Publications
Photo-chemo-dynamical analysis and the origin of the bulge globular cluster Palomar 6
Valentini, M.; Anders, F.; Chiappini, C. +7 more
Context. Palomar 6 (Pal6) is a moderately metal-poor globular cluster projected towards the Galactic bulge. A full analysis of the cluster can give hints on the early chemical enrichment of the Galaxy and a plausible origin of the cluster.
Aims: The aim of this study is threefold: a detailed analysis of high-resolution spectroscopic data obta…
Multi-tracer analysis of straight depolarisation canals in the surroundings of the 3C 196 field
Haverkorn, Marijke; Turić, Luka; Jelić, Vibor +6 more
Context. Faraday tomography of a field centred on the extragalactic point source 3C 196 with the LOw Frequency ARray (LOFAR) revealed an intertwined structure of diffuse polarised emission with straight depolarisation canals and tracers of the magnetised and multi-phase interstellar medium (ISM), such as dust and line emission from atomic hydrogen…
First-year ion-acoustic wave observations in the solar wind by the RPW/TDS instrument on board Solar Orbiter
Maksimovic, M.; Bale, S. D.; Chust, T. +21 more
Context. Electric field measurements of the Time Domain Sampler (TDS) receiver, part of the Radio and Plasma Waves (RPW) instrument on board Solar Orbiter, often exhibit very intense broadband wave emissions at frequencies below 20 kHz in the spacecraft frame. During the first year of the mission, the RPW/TDS instrument was operating from the firs…
The most luminous blue quasars at 3.0 < z < 3.3. II. C IV/X-ray emission and accretion disc physics
Marconi, A.; Vignali, C.; Gilli, R. +12 more
We analyse the properties of the high-ionisation C IVλ1549 broad emission line in connection with the X-ray emission of 30 bright, optically selected quasars at z ≃ 3.0−3.3 with pointed XMM-Newton observations, which were selected to test the suitability of active galactic nuclei as cosmological tools. In our previous work, we found that a large f…
A MUSE spectro-imaging study of the Th 28 jet: Precession in the inner jet
Ray, T. P.; Eislöffel, J.; Bacciotti, F. +5 more
Context. Th 28 is a Classical T Tauri star in the Lupus 3 cloud that drives an extended bipolar jet. Previous studies of the inner jet identified signatures of rotation around the outflow axis, a key result for theories of jet launching. Thus this is an important source in which to investigate the poorly understood jet launching mechanism.
Ai…
Toward the true number of flaring giant stars in the Kepler field. Are their flaring specialities associated with their being giant stars?
Pál, A.; Günther, M. N.; Oláh, K. +4 more
Aims: We aim to give a reliable estimate of the number of flaring giant stars in the Kepler field. By analyzing the flaring activity of these stars, we explored their flare statistics and the released flare energies. The role of oscillation in suppressing magnetic activity was also investigated. We searched for flaring specialities that may b…
The HARPS search for southern extra-solar planets. XLVI. 12 super-Earths around the solar type stars HD 39194, HD 93385, HD 96700, HD 154088, and HD 189567
Alonso, R.; Bouchy, F.; Deleuil, M. +23 more
Context. We present precise radial-velocity measurements of five solar-type stars observed with the HARPS Echelle spectrograph mounted on the 3.6-m telescope in La Silla (ESO, Chile). With a time span of more than 10 yr and a fairly dense sampling, the survey is sensitive to low mass planets down to super-Earths on orbital periods up to 100 days. …
Solar surges related to UV bursts. Characterization through k-means, inversions, and density diagnostics
Guglielmino, S. L.; Sainz Dalda, A.; Nóbrega-Siverio, D.
Context. Surges are cool and dense ejections typically observed in chromospheric lines and closely related to other solar phenomena such as UV bursts or coronal jets. Even though surges have been observed for decades now, questions regarding their fundamental physical properties such as temperature and density, as well as their impact on upper lay…
Characterizing the morphology of the debris disk around the low-mass star GSC 07396-00759
Bayo, A.; Ginski, C.; Henning, Th. +17 more
Context. Debris disks have commonly been studied around intermediate-mass stars. Their intense radiation fields are believed to efficiently remove the small dust grains that are constantly replenished by collisions. For lower-mass central objects, in particular M stars, the dust removal mechanism needs to be further investigated given the much wea…
Water and methanol ice in L 1544
Alves, J.; Caselli, P.; Jiménez-Serra, I. +4 more
Context. Methanol and complex organic molecules have been found in cold starless cores, where a standard warm-up scenario would not work because of the absence of heat sources. A recent chemical model attributed the presence of methanol and large organics to the efficient chemical desorption and a class of neutral-neutral reactions that proceed fa…