Search Publications
Truncation of stellar disks in galaxies at z ≈ 1
Pérez, I.
We report here the first evidence for stellar disk truncation at high redshift, based on surface photometry of a sample of 16 high redshift (0.6<z<1.0) disk galaxies from the GOODS HST/ACS data. The radial profiles are best fit by a double exponential profile. This result agrees with the profile of disks in local galaxies. The cosmological s…
Discovery of X-ray absorption features from the dipping low-mass X-ray binary XB 1916-053 with XMM-Newton
Parmar, A. N.; Boirin, L.; Paltani, S. +2 more
We report the discovery of narrow Fe XXV and Fe XXVI Kα X-ray absorption lines at 6.65+0.05-0.02 and 6.95+0.05-0.04 keV in the persistent emission of the dipping low-mass X-ray binary (LMXB) XB 1916-053 during an XMM-Newton observation performed in September 2002. In addition, there is marginal evidence …
On the network structures in solar equatorial coronal holes. Observations of SUMER and MDI on SOHO
Wilhelm, K.; Marsch, E.; Xia, L. D.
By combining observations of the Sun made by SUMER and MDI aboard SOHO, the network structures in equatorial coronal holes have been studied, in particular the relationship between the ultraviolet emission-line parameters (line radiance, Doppler shift and line width) and the underlying magnetic field. The bases of coronal holes seen in chromospher…
First observation of Jupiter by XMM-Newton
Branduardi-Raymont, G.; Soria, R.; Ramsay, G. +4 more
We present the first X-ray observation of Jupiter by XMM-Newton. Images taken with the EPIC cameras show prominent emission, essentially all confined to the 0.2-2.0 keV band, from the planet's auroral spots; their spectra can be modelled with a combination of unresolved emission lines of highly ionised oxygen (OVII and OVIII), and a pseudo-continu…
Organic matter in Seyfert 2 nuclei: Comparison with our Galactic center lines of sight
Dartois, E.; d'Hendecourt, L.; Marco, O. +3 more
We present ESO - Very Large Telescope and ESA - Infrared Space Observatory 3 to 4 µm spectra of Seyfert 2 nuclei as compared to our galactic center lines of sight. The diffuse interstellar medium probed in both environments displays the characteristic 3.4 µm aliphatic CH stretch absorptions of refractory carbonaceous material. The prof…
Abundance analysis of targets for the COROT/MONS asteroseismology missions. II. Abundance analysis of the COROT main targets
Magain, P.; Catala, C.; Bikmaev, I. F. +13 more
One of the goals of the ground-based support program for the COROT and MONS/RÖMER satellite missions is to characterize suitable target stars for the part of the missions dedicated to asteroseismology. We present the detailed abundance analysis of nine of the potential COROT main targets using the semi-automatic software VWA. For two additional CO…
Comparison between KPVT/SPM and SoHO/MDI magnetograms with an application to solar irradiance reconstructions
Solanki, S. K.; Krivova, N. A.; Wenzler, T. +1 more
To be able to use both space- and ground-based solar magnetograms and construct long time series of derived parameters it is important to cross-calibrate them so that we can estimate their reliability and combine them. Using two different techniques, we compare magnetograms as well as continuum images recorded by the Spectropolarimeter (SPM) on Ki…
Monte Carlo simulations of the halo white dwarf population
Burkert, A.; Torres, S.; Isern, J. +1 more
The interpretation of microlensing results towards the Large Magellanic Cloud (LMC) still remains controversial. While white dwarfs have been proposed to explain these results and, hence, to contribute significantly to the mass budget of our Galaxy, there are also several constraints on the role played by white dwarfs. In this paper we analyze sel…
EUVE observations of the helium glow: Interstellar and solar parameters
Lallement, R.; Lemoine, M.; Vallerga, J. +2 more
We present new observations of the diffuse He I 58.4 nm background recorded in 1998 and 2000 by the Extreme Ultraviolet Explorer (EUVE). This emission is due to resonant scattering of the solar EUV radiation by interstellar and geocoronal helium. Depending on the geometry and relative velocity, a fraction of the interstellar helium glow can be abs…
Arrival time of halo coronal mass ejections in the vicinity of the Earth
Gopalswamy, N.; Lara, A.; Manoharan, P. K. +1 more
We describe an empirical model to predict the 1-AU arrival time of halo CMEs. This model is based on the effective acceleration described by Gopalswamy et al. (\cite{Gopalswamy00}a, Geophys. Res. Lett., 27, 145). We verify the Helios/Pioneer Venus Orbiter(PVO) estimation of the effective acceleration profile (Gopalswamy et al. \cite{Gopalswamy01}a…