Search Publications
The gaia survey contribution to EChO target selection and characterization
Sozzetti, Alessandro; Damasso, Mario
The scientific output of the proposed EChO mission (in terms of spectroscopic characterization of the atmospheres of transiting extrasolar planets) will be maximized by a careful selection of targets and by a detailed characterization of the main physical parameters (such as masses and radii) of both the planets and their stellar hosts. To achieve…
Eruption of the magnetic flux rope in a quick decaying active region
Yang, Shangbin; Liu, Jihong; Xie, Wenbin
An isolated and quickly decaying active region (NOAA 9729) was observed as it passed across the solar disk. There was only one CME associated with the active region, which provides a good opportunity to investigate the whole process of the CME. A filament in this active region was observed to rise rapidly before stalling and disintegrating into fl…
Ultraviolet Spectroscopy of PQ Gem and V405 Aur from the HST and IUE Satellites
Sanad, M. R.
Ultraviolet spectra of two intermediate polars (IPs), PQ Gem and V405 Aur, observed with Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph and Faint Object Spectrograph and International Ultraviolet Explorer (IUE) satellites were analyzed during the period between 1994-2000. We estimated the reddening of the two systems from the 22…
Simulations of cm-wavelength Sunyaev-Zel'dovich galaxy cluster and point source blind sky surveys and predictions for the RT32/OCRA-f and the Hevelius 100-m radio telescope
Birkinshaw, Mark; Lew, Bartosz; Wilkinson, Peter +1 more
We investigate the effectiveness of blind surveys for radio sources and galaxy cluster thermal Sunyaev-Zel'dovich effects (TSZEs) using the four-pair, beam-switched OCRA-f radiometer on the 32-m radio telescope in Poland. The predictions are based on mock maps that include the cosmic microwave background, TSZEs from hydrodynamical simulations of l…
Astrometric observations of Phobos with the SRC on Mars Express. New data and comparison of different measurement techniques
Oberst, J.; Hoffmann, H.; Willner, K. +7 more
Aims: From April 2008 to August 2011 Mars Express carried out 74 Phobos flybys at distances between 669 and 5579 km. Images taken with the Super Resolution Channel (SRC) were used to determine the spacecraft-centered right ascension and declination of this Martian moon.
Methods: Image positions of Phobos were measured using the limb-fit …
Mass distribution in an assembling super galaxy group at z = 0.37
Tran, Kim-Vy H.; Schrabback, Tim; Moustakas, John +4 more
Aims: We present a weak gravitational lensing analysis of supergroup SG1120-1202, consisting of four distinct X-ray-luminous groups that will merge to form a cluster comparable in mass to Coma at z = 0. These groups lie within a projected separation of 1 to 4 Mpc and within Δv = 550 km s-1 and form a unique protocluster to study th…
A new estimate of the Local Standard of Rest from data on young objects
Bobylev, V. V.; Bajkova, A. T.
To estimate the peculiar velocity of the Sun with respect to the Local Standard of Rest (LSR), we use young objects in the Solar neighborhood with distance measurement errors within 10%--15%. These objects include the nearest Hipparcos O--B2.5 type stars, masers with VLBI trigonometric parallaxes, and two samples consisting of the youngest and mid…
Determination of fundamental asteroseismic parameters using the Hilbert transform
Roth, Markus; Schad, Ariane; Kiefer, René +1 more
Context. Solar-like oscillations exhibit a regular pattern of frequencies. This pattern is dominated by the small and large frequency separations between modes. The accurate determination of these parameters is of great interest, because they give information about e.g. the evolutionary state and the mass of a star.
Aims: We want to develop a…
Comparisons of electron acceleration efficiency among different structures during magnetic reconnection: a Cluster multicase study
Li, H.; Zhou, M.; Li, T. +2 more
Magnetic reconnection has long been believed to be an efficient engine for energetic electrons production. Four different structures have been proposed for electrons being energized: flux pileup region, density cavity located around the separatrix, magnetic island and thin current sheet. In this paper, we compare the electron acceleration efficien…
The legacy of Venus Express: highlights from the first European planetary mission to Venus
Drossart, Pierre; Montmessin, Franck
The ESA/Venus Express mission spent more than 8 years in orbit around Venus to extensively study its atmosphere, ionosphere and plasma environment and unveil new aspects of its surface. Extensive reviews of the work of Venus Express are underway, to cover in-depth studies of the new face of Venus revealed by Venus Express and ground-based concurre…