Search Publications
OSIRIS observations of meter-sized exposures of H2O ice at the surface of 67P/Churyumov-Gerasimenko and interpretation using laboratory experiments
Jorda, L.; Lamy, P. L.; Bertaux, J. -L. +52 more
Since OSIRIS started acquiring high-resolution observations of the surface of the nucleus of comet 67P/Churyumov-Gerasimenko, over one hundred meter-sized bright spots have been identified in numerous types of geomorphologic regions, but mostly located in areas receiving low insolation. The bright spots are either clustered, in debris fields close…
Photometric properties of comet 67P/Churyumov-Gerasimenko from VIRTIS-M onboard Rosetta
Bellucci, G.; Mottola, S.; Fornasier, S. +17 more
Aims: We investigate the nucleus photometric properties of the comet 67P/Churyumov-Gerasimenko as observed by the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) onboard the Rosetta spacecraft. Both full-disk and disk-resolved images of the comet have been analyzed, deriving light and phase curves as well as a photometric reduction…
Planck 2013 results. XXXII. The updated Planck catalogue of Sunyaev-Zeldovich sources
Böhringer, H.; Kneissl, R.; Dahle, H. +275 more
We update the all-sky Planck catalogue of 1227 clusters and cluster candidates (PSZ1) published in March 2013, derived from detections of the Sunyaev-Zeldovich (SZ) effect using the first 15.5 months of Planck satellite observations. As an addendum, we deliver an updated version of the PSZ1 catalogue, reporting the further confirmation of 86 Planc…
Occurrence of radio halos in galaxy clusters. Insight from a mass-selected sample
Brunetti, G.; Kale, R.; Venturi, T. +4 more
Context. Giant radio halos (RH) are diffuse Mpc-scale synchrotron sources detected in some massive and merging galaxy clusters. An unbiased study of the statistical properties of RHs is crucial to constraining their origin and evolution.
Aims: We investigate the occurrence of RHs and its dependence on the cluster mass in a Sunyaev-Zel'dovich …
Galaxy-wide outflows in z ~ 1.5 luminous obscured quasars revealed through near-IR slit-resolved spectroscopy
Maiolino, R.; Salvato, M.; Marconi, A. +10 more
Aims: The co-evolution of galaxies and supermassive black holes (SMBHs) requires that some sort of feedback mechanism is operating during the active galactic nuclei (AGN) phases. AGN driven winds are the most likely candidates for such feedback mechanism, but direct observational evidence of their existence and of their effects on the host ga…
Molecular depletion times and the CO-to-H2 conversion factor in metal-poor galaxies
Maiolino, R.; Menten, K. M.; Hunt, L. K. +8 more
Tracing molecular hydrogen content with carbon monoxide in low-metallicity galaxies has been exceedingly difficult. Here we present a new effort, with IRAM 30-m observations of 12CO(1-0) of a sample of 8 dwarf galaxies having oxygen abundances ranging from 12 + log(O/H) ~ 7.7 to 8.4. CO emission is detected in all galaxies, including th…
Molecular gas content in strongly lensed z ~ 1.5-3 star-forming galaxies with low infrared luminosities
Kneib, J. -P.; Schaerer, D.; Dessauges-Zavadsky, M. +10 more
To extend the molecular gas measurements to more typical star-forming galaxies (SFGs) with star formation rates SFR< 40 M⊙ yr-1 and stellar masses M∗< 2.5 × 1010M⊙ at z ~ 1.5-3, we have observed CO emission with the IRAM Plateau de Bure Interferometer and the IRAM 30 m telescope for five…
Planck intermediate results. XXI. Comparison of polarized thermal emission from Galactic dust at 353 GHz with interstellar polarization in the visible
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +193 more
The Planck survey provides unprecedented full-sky coverage of the submillimetre polarized emission from Galactic dust. In addition to the information on the direction of the Galactic magnetic field, this also brings new constraints on the properties of dust. The dust grains that emit the radiation seen by Planck in the submillimetre also extinguis…
The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs in wide orbits. I. Sample definition and characterization
Moutou, C.; Henning, T.; Alcalá, J. M. +28 more
Context. Young, close stars are ideal targets for searching planets using the direct imaging technique. The determination of stellar parameters is crucial for the interpretation of imaging survey results, particularly since the luminosity of substellar objects has a strong dependence on system age.
Aims: We have conducted a large program with…
What drives the dust activity of comet 67P/Churyumov-Gerasimenko?
Blum, J.; Gundlach, B.; Keller, H. U. +1 more
Context. The gas-driven dust activity of comets is still an unsolved question in cometary physics. Homogeneous dust layers composed of micrometer-sized grains possess tensile strengths of ~1 kPa, which is far higher than typical gas pressures caused by the sublimation of the ices beneath the covering dust layer. This implies that the dust grains c…