Search Publications
Variation in dust properties in a dense filament of the Taurus molecular complex (L1506)
Abergel, A.; Juvela, M.; Ristorcelli, I. +6 more
Aims: We observed the L1506 filament, which is located in the Taurus molecular complex, with the Herschel PACS and SPIRE instruments. Our aim is to prove the variation in grain properties along the entire length of the filament. In particular, we want to determine above which gas density this variation arises and what changes in the grain opt…
Massive stars at low metallicity. Evolution and surface abundances of O dwarfs in the SMC
Bouret, J. -C.; Martins, F.; Hillier, D. J. +4 more
Aims: We aim to study the properties of massive stars at low metallicity, with an emphasis on their evolution, rotation, and surface abundances. We focus on O-type dwarfs in the Small Magellanic Cloud. These stars are expected to have weak winds that do not remove significant amounts of their initial angular momentum.
Methods: We analyze…
High-fidelity view of the structure and fragmentation of the high-mass, filamentary IRDC G11.11-0.12
Henning, T.; Kainulainen, J.; Stutz, A. +1 more
Star formation in molecular clouds is intimately linked to their internal mass distribution. We present an unprecedentedly detailed analysis of the column density structure of a high-mass, filamentary molecular cloud, namely IRDC G11.11-0.12 (G11). We use two novel column density mapping techniques: high-resolution (FWHM = 2″, or ~0.035 pc) dust e…
Why circumstellar disks are so faint in scattered light: the case of HD 100546
Dominik, C.; Min, M.; Schneider, G. +2 more
Context. Scattered light images of circumstellar disks play an important role in characterizing the planet forming environments around young stars. The characteristic size of the scattering dust grains can be estimated from the observed brightness asymmetry between the near and far side of the disk, for example using standard Mie theory. Such mode…
The Extended GMRT Radio Halo Survey. I. New upper limits on radio halos and mini-halos
Brunetti, G.; Kale, R.; Giacintucci, S. +5 more
Context. A fraction of galaxy clusters host diffuse radio sources called radio halos, radio relics and mini-halos. These are associated with the relativistic electrons and magnetic fields present on ~Mpc scales in the intra-cluster medium.
Aims: We aim to carry out a systematic radio survey of all luminous galaxy clusters selected from the RE…
Structure of sunspot penumbral filaments: a remarkable uniformity of properties
Lagg, Andreas; Solanki, Sami K.; Tiwari, Sanjiv Kumar +1 more
Context. The sunspot penumbra comprises numerous thin, radially elongated filaments that are central for heat transport within the penumbra, but whose structure is still not clear.
Aims: We aim to investigate the fine-scale structure of these penumbral filaments.
Methods: We perform a depth-dependent inversion of spectropolarimetric data…
VLT/VIMOS integral field spectroscopy of luminous and ultraluminous infrared galaxies: 2D kinematic properties
Arribas, Santiago; Colina, Luis; Bellocchi, Enrica +1 more
Context. (Ultra) Luminous infrared galaxies [(U)LIRGs] host the most extreme star-forming events in the present universe and are places where a significant fraction of the past star formation beyond z ~ 1 has occurred. The kinematic characterization of this population is important to constrain the processes that govern such events.
Aims: We p…
The Herschel view of the massive star-forming region NGC 6334
Martin, P. G.; Hill, T.; Roussel, H. +30 more
Aims: Fundamental to any theory of high-mass star formation are gravity and turbulence. Their relative importance, which probably changes during cloud evolution, is not known. By investigating the spatial and density structure of the high-mass star-forming complex NGC 6334 we aim to disentangle the contributions of turbulence and gravity.
Abell 2142 at large scales: An extreme case for sloshing?
Rossetti, M.; Molendi, S.; De Grandi, S. +4 more
We present results obtained with a new XMM-Newton observation of A2142, a textbook example of a cluster with multiple cold fronts, which has been studied in detail with Chandra but whose large scale properties are presented here for the first time. We report the discovery of a new cold front, the most distant one ever detected in a galaxy cluster,…
First stars. XVI. HST/STIS abundances of heavy elements in the uranium-rich metal-poor star CS 31082-001
Bonifacio, P.; Caffau, E.; Spite, M. +14 more
Context. The origin and site(s) of the r-process nucleosynthesis is(are) still not known with certainty, but complete, detailed r-element abundances offer our best clues. The few extremely metal-poor (EMP) stars with large r-element excesses allow us to study the r-process signatures in great detail, with minimal interference from later stages of …