Search Publications
Galactic cold cores: Herschel study of first Planck detections
Bernard, J. -P.; Giard, M.; Juvela, M. +25 more
Context. We present the first results from the project Galactic cold cores, where the cold interstellar clouds detected by the Planck satellite are studied with Herschel photometric observations. The final Planck catalogue is expected to contain several thousand sources. The Herschel observations during the science demonstration phase provided the…
Dissecting the Moth: discovery of an off-centered ring in the HD 61005 debris disk with high-resolution imaging
Ménard, F.; Quanz, S. P.; Henning, T. +17 more
The debris disk known as “The Moth” is named after its unusually asymmetric surface brightness distribution. It is located around the ~90 Myr old G8V star HD 61005 at 34.5 pc and has previously been imaged by the HST at 1.1 and 0.6 µm. Polarimetric observations suggested that the circumstellar material consists of two distinct components, a …
Proton velocity distribution in thin current sheets: Cluster observations and theory of transient trajectories
Petrukovich, A. A.; Zelenyi, L. M.; Nakamura, R. +1 more
The structure of thin current sheets in the Earth magnetotail is studied on the basis of 43 crossings by Cluster spacecraft. Current sheet embedding is described as the ratio of the magnitudes of magnetic field at the thin current sheet boundary and in the lobe. This ratio is found to be ∼0.4 on average. The proton population consists of the curre…
The HerMES SPIRE submillimeter local luminosity function
Altieri, B.; Aussel, H.; Elbaz, D. +77 more
Local luminosity functions are fundamental benchmarks for high-redshift galaxy formation and evolution studies as well as for models describing these processes. Determining the local luminosity function in the submillimeter range can help to better constrain in particular the bolometric luminosity density in the local Universe, and Herschel offers…
Radiolysis of H2O:CO2 ices by heavy energetic cosmic ray analogs
Pilling, S.; Seperuelo Duarte, E.; da Silveira, E. F. +3 more
An experimental study of the interaction of heavy, highly charged, and energetic ions (52 MeV 58Ni13+) with pure H2O, pure CO2 and mixed H2O:CO2 astrophysical ice analogs is presented. This analysis aims to simulate the chemical and the physicochemical interactions induced by heavy …
XMM-Newton Observations of HD 189733 During Planetary Transits
Knutson, H.; Pillitteri, I.; Henry, G. W. +4 more
We report on two XMM-Newton observations of the planetary host star HD 189733. The system has a close in planet and it can potentially affect the coronal structure via interactions with the magnetosphere. We have obtained X-ray spectra and light curves from EPIC and the Reflection Grating Spectrometer on board XMM-Newton which we have analyzed and…
Large density fluctuations in the martian ionosphere as observed by the Mars Express radar sounder
Gurnett, D. A.; Barabash, S.; Winningham, J. D. +5 more
The MARSIS (Mars Advanced Radar for Subsurface and Ionosphere Sounding) instrument on the Mars Express spacecraft provides both local and remote measurements of electron densities and measurements of magnetic fields in the martian ionosphere. The density measurements show a persistent level of large fluctuations, sometimes as much as a factor of t…
Ultra-deep Mid-infrared Spectroscopy of Luminous Infrared Galaxies at z ~ 1 and z ~ 2
Veilleux, Sylvain; Wuyts, Stijn; Fadda, Dario +11 more
We present ultra-deep mid-infrared spectra of 48 infrared-luminous galaxies in the GOODS-south field obtained with the Infrared Spectrograph on the Spitzer Space Telescope. These galaxies are selected among faint infrared sources (0.14-0.5 mJy at 24 µm) in two redshift bins (0.76-1.05 and 1.75-2.4) to sample the major contributors to the cos…
Impact cratering records of the mid-sized, icy saturnian satellites
Schenk, Paul; Kirchoff, Michelle R.
Resolution of Voyager 1 and 2 images of the mid-sized, icy saturnian satellites was generally not much better than 1 km per line pair, except for a few, isolated higher resolution images. Therefore, analyses of impact crater distributions were generally limited to diameters ( D) of tens of kilometers. Even with the limitation, however, these analy…
Near-infrared dust and line emission from the central region of Mrk1066: constraints from Gemini NIFS
Storchi-Bergmann, Thaisa; Nagar, Neil M.; Riffel, Rogemar A.
We present integral field spectroscopy of the inner 700 × 700pc2 of the Seyfert galaxy Mrk1066 obtained with Gemini's Near-Infrared Integral Field Spectrograph (NIFS) at a spatial resolution of ~35pc. This high spatial resolution allowed us to observe, for the first time in this galaxy, an unresolved dust concentration with mass ~1.4 × …