Search Publications
Abell 611. II. X-ray and strong lensing analyses
Giordano, F.; Ettori, S.; Gavazzi, R. +10 more
We present the results of our analyses of the X-ray emission and of the strong lensing systems in the galaxy cluster Abell 611 [z = 0.288]. This cluster is an optimal candidate for a comparison of the mass reconstructions obtained through X-ray and lensing techniques, because of its very relaxed dynamical appearance and its exceptional strong lens…
The extent of dust in NGC 891 from Herschel/SPIRE images
Bianchi, S.; Xilouris, E. M.
We analyse Herschel/SPIRE images of the edge-on spiral galaxy NGC 891 at 250, 350, and 500 µm. Using a 3D radiative transfer model we confirm that the dust has radial fall-off similar to the stellar disk. The dust disk shows a break at about 12 kpc from the centre, where the profile becomes steeper. Beyond this break, emission can be traced …
Discovery of multiple dust shells beyond 1 arcmin in the circumstellar envelope of IRC +10216 using Herschel/PACS
Blommaert, J. A. D. L.; Barlow, M. J.; Ottensamer, R. +9 more
We present new Herschel/PACS images at 70, 100, and 160 µm of the well-known, nearby, carbon-rich asymptotic giant branch star IRC+10216 revealing multiple dust shells in its circumstellar envelope. For the first time, dust shells (or arcs) are detected until 320''. The almost spherical shells are non-concentric and have an angular extent be…
Star-formation efficiency and metal enrichment of the intracluster medium in local massive clusters of galaxies
Zhang, Y. -Y.; Schneider, P.; Reiprich, T. H. +3 more
We have investigated the baryon-mass content in a subsample of 19 clusters of galaxies extracted from the X-ray flux-limited sample HIFLUGCS according to their positions in the sky. For these clusters, we measured total masses and characteristic radii on the basis of a rich optical spectroscopic data set, the physical properties of the intracluste…
Plaskett's star: analysis of the CoRoT photometric data
Auvergne, M.; Gosset, E.; Baudin, F. +13 more
Context. The second short run (SRa02) of the CoRoT space mission for asteroseismology was partly devoted to stars belonging to the Mon OB2 association. An intense monitoring has been performed on Plaskett's star (HD 47129) and the unprecedented quality of the light curve allows us to shed new light on this very massive, non-eclipsing binary system…
A deep wide-field sub-mm survey of the Carina Nebula complex
Menten, K. M.; Preibisch, T.; Zinnecker, H. +3 more
Context. The Great Nebula in Carina is one of the most massive (Mast,total ⪆ 25 000 M_⊙) star-forming complexes in our Galaxy and contains several stars with (initial) masses exceeding ≈ 100 M_⊙; it is therefore a superb location in which to study the physics of violent massive star-formation and the resulting feedback effects, includin…
Mid-infrared interferometry towards the massive young stellar object CRL 2136: inside the dust rim
Lumsden, S. L.; Hoare, M. G.; de Wit, W. J. +3 more
Context. Establishing the importance of circumstellar disks and their properties is crucial to fully understand massive star formation.
Aims: We aim to spatially resolve the various components that make-up the accretion environment of a massive young stellar object (⪉100 AU), and reproduce the emission from near-infrared to millimeter wavelen…
A disc inside the bipolar planetary nebula M2-9
Smith, N.; Balick, B.; Lykou, F. +4 more
Aims: Bipolarity in proto-planetary and planetary nebulae is associated with events occurring in or around their cores. Past infrared observations have revealed the presence of dusty structures around the cores, many in the form of discs. Characterising those dusty discs provides invaluable constraints on the physical processes that govern th…
The merging cluster Abell 1758 revisited: multi-wavelength observations and numerical simulations
Durret, F.; Laganá, T. F.; Haider, M.
Context. Cluster properties can be more distinctly studied in pairs of clusters, where we expect the effects of interactions to be strong.
Aims: We here discuss the properties of the double cluster Abell 1758 at a redshift z ~ 0.279. These clusters show strong evidence for merging.
Methods: We analyse the optical properties of the North …
A solar eruption triggered by the interaction between two magnetic flux systems with opposite magnetic helicity
Romano, P.; Pariat, E.; Zuccarello, F. +1 more
Context. In recent years the accumulation of magnetic helicity via emergence of new magnetic flux and/or shearing photospheric motions has been considered to play an important role in the destabilization processes that lead to eruptive phenomena occurring in the solar atmosphere.
Aims: In this paper we want to highlight a specific aspect of m…