Search Publications
Molecular hydrogen in the circumstellar environments of Herbig Ae/Be stars probed by FUSE
Deleuil, M.; Bouret, J. -C.; Roberge, A. +7 more
Context: Molecular hydrogen (H2) gas is the most abundant molecule in the circumstellar (CS) environments of young stars. It is thus a key element in our understanding of the evolution of pre-main sequence stars and their environments towards the main sequence.
Aims: At the present time, little is known about the gas as compared to the dust in…
Diffuse stellar emission in X-ray luminous galaxy clusters at z ~ 0.3. I. Is the diffuse optical light boosted and rejuvenated in merging clusters?
Zhang, Y. -Y.; Finoguenov, A.; Böhringer, H. +4 more
Context: Clusters of galaxies host a diffuse population of intergalactic stars. Diffuse optical light is observed in clusters up to redshift z ∼ 0.4. Recent cosmological hydrodynamical simulations show that this intracluster light originates nearly in parallel with the build-up of the brightest cluster galaxy (BCG), as identified at z=0. However, …
Physical parameters along the boundaries of a mid-latitude streamer and in its adjacent regions
Susino, R.; Landi, E.; Spadaro, D. +2 more
Context: Coronal streamers appear to be strictly associated with the generation of the slow solar wind, even if a firm identification of the sources of the particle flux within these structures is still an unresolved issue.
Aims: The purpose of this work is to contribute to a better knowledge of the physical characteristics of streamers and of…
Net circular polarization of sunspots in high spatial resolution
Kubo, M.; Lites, B. W.; Ichimoto, K. +8 more
Context: Net circular polarization (NCP) of spectral lines in sunspots has been most successfully explained by the presense of discontinuities in the magnetic field inclination and flow velocity along the line-of-sight in the geometry of the embedded flux tube model of penumbrae (Δγ-effect).
Aims: The fine scale structure of NCP in a sunspot i…
The host of GRB 060206: kinematics of a distant galaxy
Vreeswijk, P. M.; Wijers, R. A. M. J.; Rol, E. +13 more
Context: GRB afterglow spectra are sensitive probes of interstellar matter along the line-of-sight in their host galaxies, as well as in intervening galaxies. The rapid fading of GRBs makes it very difficult to obtain spectra of sufficient resolution and S/N to allow for these kinds of studies.
Aims: We investigate the state and properties of …
Variability-selected active galactic nuclei from supernova search in the Chandra deep field south
Boutsia, K.; Cappellaro, E.; Puccetti, S. +2 more
Context: Variability is a property shared by virtually all active galactic nuclei (AGNs), and was adopted as a criterion for their selection using data from multi epoch surveys. Low Luminosity AGNs (LLAGNs) are contaminated by the light of their host galaxies, and cannot therefore be detected by the usual colour techniques. For this reason, their …
The environmental dependence of properties of galaxies around the RDCSJ0910+54 cluster at z = 1.1
Finoguenov, A.; Morokuma, T.; Tanaka, M. +6 more
We report on the environmental dependence of properties of galaxies around the RDCSJ0910+54 cluster at z=1.1. We obtained multi-band wide-field images of the cluster with Suprime-Cam and MOIRCS on Subaru and WFCAM on UKIRT. Also, an intensive spectroscopic campaign was carried out using LRIS on Keck and FOCAS on Subaru. We collected 161 spectra wi…
An occultation event in the nucleus of the planetary nebula M 2-29
Zijlstra, A. A.; Hajduk, M.; Gesicki, K.
Aims: Eclipses and occultations of post-AGB stars provide a powerful method of exploring the near-stellar environment, including close companions and circumstellar debris disks. Only six eclipsing systems and one dust-occultation system are currently known. New cases are important for our understanding of binary evolution during the AGB mass-loss …
The structure and dynamics of a bright point as seen with Hinode, SoHO and TRACE
Doyle, J. G.; Madjarska, M. S.; Maclean, R. C. +1 more
Context: Solar coronal bright points have been studied for more than three decades, but some fundamental questions about their formation and evolution still remain unanswered.
Aims: Our aim is to determine the plasma properties of a coronal bright point and compare its magnetic topology extrapolated from magnetogram data with its appearance in…
Where are the hot ion lines in classical T Tauri stars formed?
Schmitt, J. H. M. M.; Günther, H. M.
Context: Classical T Tauri stars (hereafter CTTS) show a plethora of in- and outflow signatures in a variety of wavelength bands.
Aims: In order to constrain gas velocities and temperatures, we analyse the emission in the hot ion lines.
Methods: We use all available archival FUSE spectra of CTTS to measure the widths, fluxes and shifts of …