Search Publications
Measuring the dark matter velocity anisotropy in galaxy clusters
Piffaretti, R.; Hansen, S. H.
Aims:The Universe contains approximately 6 times more dark matter than normal baryonic matter, and directly observed fundamental difference between dark matter and baryons would both be significant for our understanding of dark matter structures and provide us with information about the basic characteristics of the dark matter particle. We discuss…
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…
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…
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…
Determination of the light curve of the Rosetta target asteroid (2867) Steins by the OSIRIS cameras onboard Rosetta
Lamy, P.; Keller, H. U.; Mottola, S. +9 more
Context: In 2004 asteroid (2867) Steins has been selected as a flyby target for the Rosetta mission. Determination of its spin period and the orientation of its rotation axis are essential for optimization of the flyby planning.
Aims: Measurement of the rotation period and light curve of asteroid (2867) Steins at a phase angle larger than achi…
Mrk 609 : resolving the circumnuclear structure with near-infrared integral field spectroscopy
Hasinger, G.; Pott, J. -U.; Eckart, A. +5 more
Aims:We present first results of near-infrared (NIR) J and H + K ESO-SINFONI integral field spectroscopy of the composite starburst/Seyfert 1.8 galaxy Mrk 609. The data were taken during the science verification period of SINFONI. We aim to investigate the morphology and excitation conditions within the central 2 kpc. Additional Nobeyama 45 m CO(1…
The host galaxy/AGN connection. Brightness profiles of early-type galaxies hosting Seyfert nuclei
Capetti, A.; Balmaverde, B.
We recently presented evidence of a connection between the brightness profiles of nearby early-type galaxies and the properties of the AGN they host. The radio loudness of the AGN appears to be univocally related to the host's brightness profile: radio-loud nuclei are only hosted by “core” galaxies while radio-quiet AGN are only found in “power-la…
Are solar maximum fan streamers a consequence of twisting sheet structures?
Habbal, S. R.; Morgan, H.
Context: Fan streamers are often observed at low to mid latitudes in the corona at solar maximum, appearing narrow in latitudinal extent near the Sun, and fanning out with height, adopting an approximately linear, but not necessarily radial, configuration above ~3 R⊙.
Aims: We offer arguments to support the conjecture that such stru…
Low surface brightness galaxies around the HDF-S. II. Distances and volume densities
Bomans, D. J.; Dettmar, R. -J.; Haberzettl, L.
Aims:With this study we aim at the spectroscopic verification of a photometrically selected sample of Low Surface Brightness (LSB) galaxy candidates in a field around the Hubble Deep Field-South (HDF-S). The sample helps to extend the parameter space for LSB galaxies to lower central surface brightnesses and to provide better estimates on the volu…
Using VO tools to investigate distant radio starbursts hosting obscured AGN in the HDF(N) region
Muxlow, T. W. B.; Beswick, R.; Walton, N. A. +16 more
Context: A 10-arcmin region around the Hubble Deep Field (North) contains 92 radio sources brighter than 40 µJy which are well-resolved by MERLIN+VLA at 0.2arcsec-2' resolution (average size ~1"). 55 of these have Chandra X-ray counterparts in the 2-Ms CDF(N) field including at least 17 with a hard X-ray photon index and high luminosity char…