Search Publications
Amorphous carbon in the disk around the post-AGB binary HR 4049. Discerning dust species with featureless opacity curves
Verhoelst, T.; Acke, B.; Lombaert, R. +7 more
Context. Infrared spectroscopy has been extensively used to determine the mineralogy of circumstellar dust. The identification of dust species with featureless opacities, however, is still ambiguous. Here we present a method to lift the degeneracy using the combination of infrared spectroscopy and interferometry.
Aims: The binary post-AGB sta…
Multi-wavelength landscape of the young galaxy cluster RX J1257.2+4738 at z = 0.866. I. The infrared view
Altieri, B.; Cepa, J.; Valtchanov, I. +16 more
Context. Many studies have shown how galaxy properties (e.g. colours, morphology, star-forming (SF) activity, active galactic nuclei population) change not only with redshift, but also with local galaxy density, revealing the important effect of the stellar/halo mass and the environment in the evolution of galaxies. A detailed analysis of the star…
Warm gas in the rotating disk of the Red Rectangle: accurate models of molecular line emission
Alcolea, J.; Bujarrabal, V.
Aims: We aim to study the excitation conditions of the molecular gas in the rotating disk of the Red Rectangle, the only post-asymptotic-giant-branch object in which the existence of an equatorial rotating disk has been demonstrated. For this purpose, we developed a complex numerical code that accurately treats radiative transfer in 2D, adapt…
CoRoT 102749568: mode identification in a δ Scuti star based on regular spacings
Auvergne, M.; Guenther, E. W.; Gandolfi, D. +10 more
Context. The high accuracy of space data increased the number of the periodicities determined for pulsating variable stars, but the mode identification is still a critical point in the non-asymptotic regime.
Aims: We use regularities in frequency spacings for identifying the pulsation modes of the recently discovered δ Sct star ID 102749568. …
Physical properties of asteroid 308635 (2005 YU55) derived from multi-instrument infrared observations during a very close Earth approach
Altieri, B.; Metcalfe, L.; Pál, A. +19 more
The near-Earth asteroid 308635 (2005 YU55) is a potentially hazardous asteroid which was discovered in 2005 and passed Earth on Nov. 8, 2011 at 0.85 lunar distances. This was the closest known approach by an asteroid of several hundred metres in diameter since 1976 when an object of similar size passed at 0.5 lunar distances. We observe…
Simultaneous XMM-Newton and HST-COS observation of 1H0419-577. The absorbing and emitting ionized gas
Kaastra, J. S.; Arav, N.; Edmonds, D. +7 more
In this paper we analyze the X-ray, UV, and optical data of the Seyfert 1.5 galaxy 1H0419-577 with the aim of detecting and studying an ionized-gas outflow. The source was observed simultaneously in the X-rays with XMM-Newton and in the UV with HST-COS. Optical data were also acquired with the XMM-Newton Optical Monitor. We detected a thin, lowly …
Thermodynamic fluctuations in solar photospheric three-dimensional convection simulations and observations
Rezaei, R.; Puschmann, K. G.; Moreno-Insertis, F. +2 more
Context. Numerical three-dimensional (3D) radiative (magneto-)hydrodynamical [(M)HD] simulations of solar convection are nowadays used to understand the physical properties of the solar photosphere and convective envelope, and, in particular, to determine the Sun's photospheric chemical abundances. To validate this approach, it is important to che…
Absence of hot gas within the Wolf-Rayet bubble around WR 16
Guerrero, M. A.; Toalá, J. A.
We present the analysis of XMM-Newton archival observations towards the Wolf-Rayet (WR) bubble around WR 16. Despite the closed bubble morphology of this WR nebula, the XMM-Newton observations show no evidence of diffuse emission in its interior as in the similar WR bubbles NGC 6888 and S 308. We use the present observations to estimate a 3-σ uppe…
XMM-Newton and Swift observations of XTE J1743-363
Campana, S.; Israel, G.; Stella, L. +5 more
XTE J1743-363 is a poorly known hard X-ray transient, which displays short and intense flares similar to those observed from supergiant fast X-ray transients. The probable optical counterpart shows spectral properties similar to those of an M8 III giant, thus suggesting that XTE J1743-363 belongs to the class of the symbiotic X-ray binaries class.…
The XMM Deep survey in the CDF-S. V. Iron K lines from active galactic nuclei in the distant Universe
Vignali, C.; Gilli, R.; Ranalli, P. +11 more
Context. X-ray spectroscopy of active galactic nuclei (AGN) offers the opportunity to directly probe the inner regions of the accretion disk. Reflection of the primary continuum on the circumnuclear accreting matter produces features in the X-ray spectrum that help to explore the physics and the geometry of the innermost region, close to the centr…