Search Publications
XMM-Newton Observations of G32.45+0.1 and G38.55+0.0: Diffuse Hard X-Ray Sources Found by the ASCA Galactic Plane Survey
Ueno, Masaru; Yamaguchi, Hiroya; Koyama, Katsuji +2 more
We report on XMM-Newton observations of G32.45+0.1 and G38.55+0.0. These were discovered as diffuse hard X-ray sources by the ASCA Galactic Plane Survey, but the limited spatial resolution of ASCA could not conclude whether these are truly diffuse or a group of unresolved point-sources. XMM-Newton, with higher spatial resolution than ASCA, confirm…
W Hya: Molecular inventory by ISO-SWS
Waters, L. B. F. M.; Feuchtgruber, H.; Justtanont, K. +2 more
Infrared spectroscopy is a powerful tool to probe the inventory of solid state and molecular species in circumstellar ejecta. Here we analyse the infrared spectrum of the Asymptotic Giant Branch star W Hya, obtained by the Short and Long Wavelength Spectrometers on board of the Infrared Satellite Observatory. These spectra show evidence for the pr…
ISOCAM observations in the Lockman Hole . II. The 14.3 µm deep survey: Data reduction, catalogue and source counts
Elbaz, D.; Rodighiero, G.; Cesarsky, C. +3 more
We present a new analysis of the ISOCAM 14.3 µm deep survey in a 20 × 20 square arcmins area in the Lockman Hole. This survey is intermediate between the ultra-deep surveys and the shallow surveys in the ELAIS fields. The data have been analyzed with the method presented by Lari et al. (\cite{Lar01}). We have produced a catalogue of 283 sour…
Hydrogen in the atmosphere of the evolved WN3 Wolf-Rayet star WR 3: defying an evolutionary paradigm?
Crowther, P. A.; Morel, T.; Chené, A. -N. +6 more
WR 3 is the brightest very early-type WN star in the sky. Based on several years of time-resolved spectroscopy and precision photometry on various time-scales, we deduce that WR 3 is most likely a single, weak-lined star of type WN3ha (contrary to its current catalogue-type of WN3 + O4), with H lines occurring both in emission and absorption in it…
X-ray spectroscopy of the W UMa-type binary VW Cephei
Gondoin, P.
VW Cephei, a W UMa-type binary system, was observed twice with a four week interval in October 2002 by the XMM-Newton space observatory. During the first observation, the source appears to be quiescent. A shallow dip in the X-ray light curve during primary eclipse indicates that the primary and secondary stars both contribute to the X-ray emission…
Integral field spectroscopy of extended Lyα emission from the DLA galaxy in Q2233+131
Jahnke, K.; Popović, L. Č.; Christensen, L. +5 more
This paper presents observations of an extended Lyman-α emission nebula surrounding the galaxy responsible for the Damped Lyman-α Absorption (DLA) line in the spectrum of the quasar
Chemical composition of Titan's haze: Are PAHs present?
McKay, Christopher P.; Toon, Owen B.; Trainer, Melissa G. +4 more
Previous laboratory studies of haze aerosols analogous to those in Titan's atmosphere have shown evidence of the formation of polycyclic aromatic hydrocarbons (PAHs). If present, PAHs may provide a mechanism for both particle formation and nitrogen incorporation. We have conducted new experiments simulating Titan haze production using an Aerosol M…
Kinematics of stellar associations: the epicycle approximation and the convergent point method
Olling, Rob P.; Makarov, Valeri V.; Teuben, Peter J.
Employing analytical and numerical tools, we expound the Galactic epicycle theory to describe the kinematic evolution of stellar, gravitationally unbound associations in the vicinity of the Sun. We estimate the limits of applicability of the analytical epicycle approximation and harmonic vertical motion by numerical integration of test orbits with…
High resolution millimeter imaging of the proto-planetary nebula He 3-1475
Bachiller, R.; Forveille, T.; Cox, P. +2 more
We report high resolution (1 arcsec-2 arcsec) imaging of the CO 2-1 line and the millimeter continuum in the proto-planetary nebula He 3-1475. The observations reveal the presence of a massive (∼ 0.6 M⊙) envelope of molecular gas around the origin of the remarkable bipolar jet system seen in optical images with the HST. The CO kinematic…
Orientation and motion of a discontinuity from single-spacecraft measurements of plasma velocity and density: Minimum mass flux residue
Balogh, A.; Lavraud, B.; Dunlop, M. W. +4 more
A simple analytical solution is presented to the problem of determining the orientation and motion of a one-dimensional discontinuity in plasma velocity and density, measured by a single spacecraft as the discontinuity moves past it. The method developed is called Minimum Massflux Residue (MMR). Illustrations of the method, based on Cluster measur…