Search Publications
Time variability of X-ray sources in the M 31 centre field
Stiele, H.; Pietsch, W.; Haberl, F. +1 more
Aims:We present an extension to our XMM-Newton X-ray source catalogue of
Methods: As a source list we used our extended ca…
Asteroid 2867 Steins. III. Spitzer Space Telescope observations, size determination, and thermal properties
Jorda, L.; Lamy, P. L.; Barucci, M. A. +6 more
Context: Asteroid 2867 Steins is the first target of the Rosetta space mission with a flyby scheduled in September 2008.
Aims: An early characterization is needed to optimize the flyby parameters and the science operations, and to maximize the scientific return.
Methods: We used the infrared spectrograph (IRS) of the Spitzer Space Telescop…
Spectroscopy and multiband photometry of the afterglow of intermediate duration γ-ray burst GRB 040924 and its host galaxy
Hornstrup, A.; Vreeswijk, P. M.; Wijers, R. A. M. J. +19 more
Aims: We present optical photometry and spectroscopy of the afterglow and host galaxy of gamma-ray burst GRB 040924. This GRB had a rather short duration of T90 ~2.4 s, and a well sampled optical afterglow light curve. We aim to use this dataset to find further evidence that this burst is consistent with a massive star core-collapse pro…
The serendipituous discovery of a short-period eclipsing polar in 2XMMp
Watson, M. G.; Schwope, A.; Osborne, J. P. +3 more
We report the serendipituous discovery of the new eclipsing polar 2XMMp J131223.4+173659. Its striking X-ray light curve attracted immediate interest when we were visually inspecting the source products of the 2XMMp catalogue. This light curve revealed its likely nature as a magnetic cataclysmic variable of AM Herculis (or polar) type with an orbi…
Observational consequences of the recently proposed Super-Earth orbiting GJ 436
Bean, J. L.; Seifahrt, A.
Ribas and collaborators have recently proposed that an additional, ~5 M⊕ planet orbits the transiting planet host star GJ 436. Long-term dynamical interactions between the two planets leading to eccentricity excitation might provide an explanation for the transiting planet's unexpectedly large orbital eccentricity. We examine whether th…
Analysis of the Fe X and Fe XIV line width in the solar corona using LASCO-C1 spectral data
Schwenn, R.; Mierla, M.; Teriaca, L. +2 more
Aims:The purpose of this paper is to analyze the variation in the line width with height in the inner corona (region above 1.1 R⊙), by using the spectral data from LASCO-C1 aboard SOHO. We used data acquired at activity minimum (August-October 1996) and during the ascending phase of the solar cycle (March 1998).
Methods: Series of i…
Properties of high-degree oscillation modes of the Sun observed with Hinode/SOT
Kosovichev, A. G.; Mitra-Kraev, U.; Sekii, T.
Aims:With the Solar Optical Telescope on Hinode, we investigate the basic properties of high-degree solar oscillations observed at two levels in the solar atmosphere, in the G-band (formed in the photosphere) and in the Ca II H line (chromospheric emission).
Methods: We analyzed the data by calculating the individual power spectra as well as t…
Obscured and powerful AGN and starburst activities at z ~ 3.5
Berta, S.; Omont, A.; Stalin, C. S. +9 more
Aims: Short phases of coeval powerful starburst and AGN activity during the lifetimes of the most massive galaxies are predicted by various models of galaxy formation and evolution. In spite of their recurrence and high luminosity, such events are rarely observed. Finding such systems, understanding their nature, and constraining their number dens…
Integral field spectroscopy of four lensed quasars: analysis of their neighborhood and evidence for microlensing
Kneib, J. -P.; Faure, C.; Alloin, D. +4 more
Context: Gravitationally lensed quasars constitute an independent tool to derive the Hubble constant through the time-delays of their different images; they offer as well the opportunity to study the mass distribution and interstellar medium of their lensing galaxies and, through microlensing due to stars in their lensing galaxy, they also allow o…
A HST study of the environment of the Herbig Ae/Be star LkHα 233 and its bipolar jet
Ray, T. P.; Eislöffel, J.; Bacciotti, F. +3 more
Context: LkHα 233 is a Herbig Ae/Be star with a collimated bipolar jet. As such, it may be a high-mass analogue to the classical T Tauri stars and their outflows.
Aims: We investigate optical forbidden lines along the LkHα 233 jet to determine physical parameters of this jet (electron density ne, hydrogen ionisation fraction xe…