Search Publications
The complex multi-component outflow of the Seyfert galaxy NGC 7130
Knapen, J. H.; Comerón, S.; Ramos Almeida, C. +1 more
Active galactic nuclei (AGN) are a key ingredient for understanding galactic evolution, as their activity is coupled to the host galaxy properties through feedback processes. AGN-driven outflows are one of the manifestations of this feedback. The laser guide star adaptive optics mode for MUSE at the VLT now permits us to study the innermost tens o…
Aggregates of clusters in the Gaia data
Paunzen, E.; Piecka, M.
Context. The precision of the parallax measurements by Gaia is unprecedented. As of Gaia Data Release 2, the number of known nearby open clusters has increased. Some of the clusters appear to be relatively close to each other and form aggregates, which makes them interesting objects to study.
Aims: We study the aggregates of clusters which sh…
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE). VIII. Modeling ram pressure stripping of diffuse gas in the Virgo cluster spiral galaxy NGC 4330
Boquien, M.; Soida, M.; Boselli, A. +7 more
NGC 4330 is one of the Virgo galaxies whose UV emission distributions show a tail structure. An associated tail structure is also observed in the HI and Hα emission distributions. Previous dynamical modeling has shown that the galaxy is approaching the cluster center and is therefore undergoing increasing ram pressure stripping. Recent stellar pop…
Lucky spectroscopy, an equivalent technique to lucky imaging. II. Spatially resolved intermediate-resolution blue-violet spectroscopy of 19 close massive binaries using the William Herschel Telescope
Simón-Díaz, S.; Maíz Apellániz, J.; Negueruela, I. +5 more
Context. Many massive stars have nearby companions. These hamper a characterization of massive stars through spectroscopy.
Aims: We continue to obtain spatially resolved spectroscopy of close massive visual binaries to derive their spectral types.
Methods: We used the lucky spectroscopy technique to obtain a large number of short long-sl…
Possible single-armed spiral in the protoplanetary disk around HD 34282
Ménard, F.; van der Plas, G.; Avenhaus, H. +17 more
Context. During the evolution of protoplanetary disks into planetary systems we expect to detect signatures that trace mechanisms such as planet-disk interaction. Protoplanetary disks display a large variety of structures in recently published high-spatial resolution images. However, the three-dimensional morphology of these disks is often difficu…
A CHEOPS white dwarf transit search
Lendl, Monika; Brandeker, Alexis; Heng, Kevin +2 more
White dwarf spectroscopy shows that nearly half of white dwarf atmospheres contain metals that must have been accreted from planetary material that survived the red giant phases of stellar evolution. We can use metal pollution in white dwarf atmospheres as flags, signalling recent accretion, in order to prioritize an efficient sample of white dwar…
The first coronal mass ejection observed in both visible-light and UV H I Ly-α channels of the Metis coronagraph on board Solar Orbiter
Heinzel, P.; Vial, J. -C.; Woch, J. +68 more
Context. The Metis coronagraph on board Solar Orbiter offers a new view of coronal mass ejections (CMEs), observing them for the first time with simultaneous images acquired with a broad-band filter in the visible-light interval and with a narrow-band filter around the H I Ly-α line at 121.567 nm, the so-called Metis UV channel.
Aims: We show…
A random forest-based selection of optically variable AGN in the VST-COSMOS field
Bauer, F. E.; Brandt, W. N.; Vaccari, M. +6 more
Context. The survey of the COSMOS field by the VLT Survey Telescope is an appealing testing ground for variability studies of active galactic nuclei (AGN). With 54 r-band visits over 3.3 yr and a single-visit depth of 24.6 r-band mag, the dataset is also particularly interesting in the context of performance forecasting for the Vera C. Rubin Obser…
Recurrence of galactic cosmic-ray intensity and anisotropy in solar minima 23/24 and 24/25 observed by ACE/CRIS, STEREO, SOHO/EPHIN and neutron monitors. Fourier and wavelet analysis
Modzelewska, R.; Gil, A.
Aims: We studied the 27-day variations of galactic cosmic rays (GCRs) based on neutron monitor (NM), ACE/CRIS, STEREO, and SOHO/EPHIN measurements in the solar minima 23/24 and 24/25, which are characterized by the opposite polarities of solar magnetic cycle. We used the opportunity to reanalyze the polarity dependence of the amplitudes of th…
Nebular Hα emission in Type Ia supernova 2016jae
Cappellaro, E.; Benetti, S.; Morrell, N. +7 more
There is a wide consensus that Type Ia supernovae (SNe Ia) originate from the thermonuclear explosion of CO white dwarfs (WDs), with the lack of hydrogen in the observed spectra as a distinctive feature. Here, we present supernova (SN) 2016jae, which was classified as an SN Ia from a spectrum obtained soon after its discovery. The SN reached a B-b…