Search Publications
Galaxy populations in the most distant SPT-SZ clusters. II. Galaxy structural properties in massive clusters at 1.4 ≲ z ≲ 1.7
Bayliss, M. B.; Sharon, K.; Pannella, M. +12 more
We investigate structural properties of massive galaxy populations in the central regions (< 0.7 r500) of five very massive (M200 > 4 × 1014 M⊙), high-redshift (1.4 ≲ z ≲ 1.7) galaxy clusters from the 2500 deg2 South Pole Telescope Sunyaev Zel'dovich effect (SPT-SZ) survey. We probe the …
A Herschel study of the high-mass protostar IRAS 20126+4104
Testi, L.; Molinari, S.; Lorenzani, A. +3 more
We performed Herschel observations of the continuum and line emission from the high-mass star-forming region IRAS 20126+4104, which hosts a well-studied B-type (proto)star powering a bipolar outflow and is associated with a Keplerian circumstellar disk. The continuum images at six wavelengths allowed us to derive an accurate estimate of the bolome…
A multi-wavelength view of the multiple activity cycles of ϵ Eridani
Czesla, S.; Schneider, P. C.; Stelzer, B. +3 more
ϵ Eridani is a highly active young K2 star with an activity cycle of about 3 yr established using Ca II H& K line index measurements (SMWO). This relatively short cycle has been demonstrated to be consistent with X-ray and magnetic flux measurements. Recent work suggested a change in the cyclic behaviour. Here, we report new X-ray f…
Extinction towards the cluster R136 in the Large Magellanic Cloud. An extinction law from the near-infrared to the ultraviolet
Kaper, Lex; Brands, Sarah A.; Crowther, Paul A. +4 more
Context. The cluster R136 in the giant star-forming region 30 Doradus in the Large Magellanic Cloud (LMC) offers a unique opportunity to resolve a stellar population in a starburst-like environment. Knowledge of the extinction towards this region is key for the accurate determination of stellar masses, and for the correct interpretation of observa…
The contribution of faint Lyman-α emitters to extended Lyman-α halos constrained by MUSE clustering measurements
Krumpe, M.; Wisotzki, L.; Miyaji, T. +3 more
Recent detections of extended Lyman-α halos around Lyα emitters (LAEs) have been reported on a regular basis, but their origin is still under investigation. Simulation studies predict that the outer regions of the extended halos contain a major contribution from the Lyα emission of faint, individually undetected LAEs. To address this matter from a…
An inner warp discovered in the disk around HD 110058 using VLT/SPHERE and HST/STIS
Ménard, F.; Milli, J.; Boccaletti, A. +16 more
Context. An edge-on debris disk was detected in 2015 around the young, nearby A0V star HD 110058. The disk showed features resembling those seen in the disk of β Pictoris that could indicate the presence of a perturbing planetary-mass companion in the system.
Aims: We investigated new and archival scattered light images of the disk in order t…
Sulfur abundances in three Galactic clusters: Ruprecht 106, Trumpler 5, and Trumpler 20
Bonifacio, P.; Caffau, E.; Monaco, L. +4 more
Context. Sulfur (S) is one of the lesser-studied α-elements. Published investigations of its behavior have so far focused on local stars, and only a few clusters of the Milky Way have been considered to study this topic. We aim to study the S content of the globular cluster Ruprecht 106 - which has never before been studied for this purpose, but i…
The blue supergiant Sher 25 revisited in the Gaia era
Butler, K.; Weßmayer, D.; Przybilla, N. +2 more
Aims: The evolutionary status of the blue supergiant Sher 25 and its membership to the massive cluster NGC 3603 are investigated.
Methods: A hybrid non-local thermodynamic equilibrium (non-LTE) spectrum synthesis approach is employed to analyse a high-resolution optical spectrum of Sher 25 and five similar early B-type comparison stars i…
The effect of variations in the magnetic field direction from turbulence on kinetic-scale instabilities
Verscharen, Daniel; Chen, Christopher H. K.; Opie, Simon +2 more
At kinetic scales in the solar wind, instabilities transfer energy from particles to fluctuations in the electromagnetic fields while restoring plasma conditions towards thermodynamic equilibrium. We investigate the interplay between background turbulent fluctuations at the small-scale end of the inertial range and kinetic instabilities acting to …
Multiple stellar populations found outside the tidal radius of NGC 1851 via Gaia DR3 XP spectra
Milone, Antonino P.; Lagioia, Edoardo P.; Marino, Anna F. +6 more
Aims: Ancient galactic globular clusters (GCs) have long fascinated astronomers due to their intriguing multiple stellar populations (MPs), which are characterized by variations in light element abundances. Among these clusters, type II GCs stand out as they exhibit stars with large differences in heavy-element chemical abundances. These enig…