Search Publications
XMM-Newton X-ray study of early type stars in the Carina OB1 association
van der Hucht, K. A.; Rauw, G.; Vreux, J. -M. +2 more
Aims:X-ray properties of the stellar population in the Carina OB1 association are examined with special emphasis on early-type stars. Their spectral characteristics provide some clues to understanding the nature of X-ray formation mechanisms in the winds of single and binary early-type stars.
Methods: A timing and spectral analysis of five obs…
Radiation transport of heliospheric Lyman-α from combined Cassini and Voyager data sets
Quemerais, E.; Möbius, E.; Bzowski, M. +15 more
Aims: Heliospheric neutral hydrogen scatters solar Lyman-α radiation from the Sun with “27-day” intensity modulations observed near Earth due to the Sun's rotation combined with Earth's orbital motion. These modulations are increasingly damped in amplitude at larger distances from the Sun due to multiple scattering in the heliosphere, providing a …
The characteristics of the IR emission features in the spectra of Herbig Ae stars: evidence for chemical evolution
Waters, L. B. F. M.; Henning, T.; Tielens, A. G. G. M. +4 more
Context: Infrared (IR) spectra provide a prime tool to study the characteristics of polycyclic aromatic hydrocarbon (PAH) molecules in regions of star formation. Herbig Ae/Be stars are a class of young pre-main sequence stellar objects of intermediate mass. They are known to have varying amounts of natal cloud material still present in their direc…
Carriers of the mid-IR emission bands in PNe reanalysed. Evidence of a link between circumstellar and interstellar aromatic dust
Joblin, C.; Szczerba, R.; Berné, O. +1 more
Context: It has been shown that the diversity of the aromatic emission features can be rationalized into different classes of objects, in which differences between circumstellar and interstellar matter are emphasised.
Aims: We probe the links between the mid-IR emitters observed in planetary nebulae (PNe) and their counterparts in the interste…
A 2163: Merger events in the hottest Abell galaxy cluster. I. Dynamical analysis from optical data
Arnaud, M.; Pratt, G. W.; Bourdin, H. +7 more
Context: A 2163 is among the richest and most distant Abell clusters, presenting outstanding properties in different wavelength domains. X-ray observations have revealed a distorted gas morphology and strong features have been detected in the temperature map, suggesting that merging processes are important in this cluster. However, the merging sce…
Flare lines in Hinode EIS spectra
Del Zanna, G.
We aim to identify the brightest hot emission lines in Hinode EIS spectra, and suggest the best ones to be used in flare observations. The EIS database was searched in order to find suitable datasets to identify the prominent lines. A B2-class flare spectrum was found. Most previous identifications are confirmed, however some are revised by noting…
Resolving the circumbinary dust disk surrounding HH 30
Pety, J.; Gueth, F.; Guilloteau, S. +1 more
Context: The jet-disk connection is an important part of the star formation process. HH 30 is a rare and beautiful example of a system exhibiting a flared edge-on disk, an optical jet and a CO molecular outflow. A recent analysis of the jet wiggling has revealed that the central star is in reality a binary object. Therefore, the dust and gas disk …
Dynamical properties of a large young disk galaxy at z = 2.03
Wuyts, S.; Franx, M.; van der Werf, P. P. +3 more
Context: The study of high redshift Tully-Fisher relations (TFRs) is limited by the use of long slit spectrographs, rest frame B band and star formation selected galaxies.
Aims: We try to circumvent these issues by using integral field spectroscopy (SINFONI), by studying the rest frame K band and stellar mass TFR, and by selecting targets with…
The Seyfert 1 Galaxy Mrk 335 at a very low flux state: mapping the soft X-ray photoionised gas
Guainazzi, M.; Santos-Lleo, M.; Nucita, A. +1 more
Context: This paper reports on an XMM-Newton observation of the Seyfert 1 Galaxy Mrk 335 performed as a target of opportunity when the source was in an unusually low flux state.
Aims: The low level of continuum emission unveiled an underlying line-rich soft X-ray spectrum, which can be studied with the Reflection Grating Spectrometer.
Meth…
Evolution of the flaring active region NOAA 10540 as a sequence of nonlinear force-free field extrapolations
Wiegelmann, T.; Thalmann, J. K.
Context: The solar corona is structured by magnetic fields. As direct measurements of the coronal magnetic field are not routinely available, it is extrapolated from photospheric vector magnetograms. When magnetic flux emerges from below the solar surface and expands into the corona, the coronal magnetic field is destabilized, leading to explosive…