Search Publications
GIADA: The Grain Impact Analyser and Dust Accumulator for the Rosetta space mission
Lopez Moreno, J. J.; Rodriguez, J.; Colangeli, L. +13 more
The ESA ROSETTA mission will perform a rendezvous with comet 67P/Churyumov-Gerasimenko and will follow and study it from about 3.25 AU to perihelion at 1.34 AU and, during the foreseen extended mission, up to 2 AU post-perihelion, in order to observe for the first time the onset of activity of a comet and to follow its evolution. The GIADA (Grain …
A Study of Compact Radio Sources in Nearby Face-on Spiral Galaxies. II. Multiwavelength Analyses of Sources in M51
Schinnerer, E.; Kilgard, R. E.; Cowan, J. J. +2 more
We report the analysis of deep radio observations of the interacting galaxy system M51 from the Very Large Array, with the goal of understanding the nature of the population of compact radio sources in nearby spiral galaxies. We detect 107 compact radio sources, 64% of which have optical counterparts in a deep Hα Hubble Space Telescope image. Thir…
Imaging of star clusters in unperturbed spiral galaxies with the Advanced Camera for Surveys. I. The low luminosity galaxy NGC 45
Larsen, S. S.; Kissler-Patig, M.; Mora, M. D.
Context: Star clusters are present in almost all types of galaxies. Here we investigate the star cluster population in the low-luminosity, unperturbed spiral galaxy
Aims: Previous ground-based observ…
Chandra Detections of Diffuse X-Ray Emission from Globular Clusters
Kokubun, Motohide; Makishima, Kazuo; Yuasa, Takayuki +1 more
Using Chandra, extended X-ray emission was detected from the direction of 6 globular clusters: 47 Tucanae, NGC 6752, M 5, ω Centauri, M 80, and NGC 6266. These X-ray sources, extending to a few arcmin, are located 1'--6' away from the cluster centers, and some are found in the direction of cluster motion through the Galactic halo. All of these sou…
Carbonates in Space: The Challenge of Low-Temperature Data
Mutschke, H.; Henning, Th.; Posch, Th. +1 more
Carbonates have repeatedly been discussed as possible carriers of stardust emission bands. However, the band assignments proposed so far were mainly based on room-temperature powder transmission spectra of the respective minerals. Since very cold calcite grains have been claimed to be present in protostars and in planetary nebulae (PNs) such as NG…
The CoRoT primary target HD 52265: models and seismic tests
Vauclair, G.; Vauclair, S.; Laymand, M. +1 more
Aims:HD 52265 is the only known exoplanet-host star selected as a main target for the seismology programme of the CoRoT satellite. As such, it will be observed continuously during five months, which is of particular interest when studying planetary systems. This star was misclassified as a giant in the Bright Star Catalog, while it is more probabl…
Is There a High-Energy Particle Population in the Quiet Solar Corona?
Doschek, G. A.; Feldman, U.; Ralchenko, Yu.
A study of spectra emitted by the quiet solar corona indicates that the majority of line intensities originating in low-lying levels are consistent with isothermal plasma of ~1.3×106 K. Nevertheless, a number of line intensities and, in particular, those belonging to ions that are typical of higher temperatures are brighter than expecte…
Deconvolution of HST images of the Cloverleaf gravitational lens. Detection of the lensing galaxy and a partial Einstein ring
Magain, P.; Chantry, V.
Archival HST/NICMOS-2 images of the Cloverleaf gravitational lens (H1413+117), a quadruply-imaged quasar, were analysed with a new method derived from the MCS deconvolution algorithm (Magain et al. 1998). This method is based on an iterative process which simultaneously allows us to determine the Point Spread Function (PSF) and to perform a deconv…
Newly Identified Star Clusters in M33. I. Integrated Photometry and Color-Magnitude Diagrams
Sarajedini, Ata; Schommer, Robert; Barker, M. K. +2 more
We present integrated photometry and color-magnitude diagrams (CMDs) for 24 star clusters in M33, of which 12 were previously uncataloged. These results are based on Advanced Camera for Surveys observations from the Hubble Space Telescope of two fields in M33. Our integrated V magnitudes and V-I colors for the previously identified objects are in …
The Rosetta Alpha Particle X-Ray Spectrometer (APXS)
Klingelhöfer, G.; Brückner, J.; D'uston, C. +2 more
The Alpha Particle X-Ray Spectrometer (APXS) is a small instrument to determine the elemental composition of a given sample. For the ESA Rosetta mission, the periodical comet 67P/Churyumov-Gerasimenko was selected as the target comet, where the lander PHILAE (after landing) will carry out in-situ observations. One of the instruments onboard is the…