Search Publications
67P/Churyumov-Gerasimenko at large heliocentric distance
Agarwal, J.; Tubiana, C.; Ortiz, J. L. +3 more
Aims: The Jupiter family comet (JFC) 67P/Churyumov-Gerasimenko (67P/C-G) is the target of ESA's ROSETTA mission. Observational campaigns and theoretical investigations were performed to characterise 67P/C-G in terms of nucleus properties (e.g. size, surface colours, rotational period), gas and dust production, and plasma environment in prepar…
Implications for the structure of the relativistic jet from multiwavelength observations of NGC 6251
Gargano, F.; Giordano, F.; Giroletti, M. +8 more
NGC 6251 is a luminous radio galaxy ≈104 Mpc away that was detected significantly with the Fermi Gamma-ray Space Telescope, and before that with EGRET (onboard the Compton Gamma-ray Observatory). Different observational constraints favor a nuclear origin for the γ-ray emission. Here we present a study of the spectral energy distribution of the cor…
Abundances in planetary nebulae: NGC 1535, NGC 6629, He2-108, and Tc1
Pottasch, S. R.; Bernard-Salas, J.; Surendiranath, R.
Context. Models have been made of stars of a given mass that produce planetary nebulae that usually begin on the AGB (although they may begin earlier) and run to the white dwarf stage. While these models cover the so-called dredge-up phases when nuclear reactions occur and the newly formed products are brought to the surface, it is important to co…
Integral-field spectroscopy of (90482) Orcus-Vanth
Berthier, J.; Carry, B.; Hestroffer, D. +8 more
Aims: We seek to constrain the surface composition of the trans-Neptunian object (90482) Orcus and its small satellite Vanth, as well as their mass and density.
Methods: We acquired near-infrared spectra (1.4-2.4 µm) of (90482) Orcus and its companion Vanth using the adaptive-optics-fed integral-field spectrograph SINFONI mounted o…
From large scale gas compression to cluster formation in the Antennae overlap region
Boulanger, F.; Nesvadba, N. P. H.; Herrera, C. N.
We present a detailed observational analysis of how merger-driven turbulence may regulate the star-formation efficiency during galaxy interactions and set the initial conditions for the formation of super star clusters. Using VLT/SINFONI, we obtained near-infrared imaging spectroscopy of a small region in the Antennae overlap region, coincident wi…
Transiting exoplanets from the CoRoT space mission. XVI. CoRoT-14b: an unusually dense very hot Jupiter
Mazeh, T.; Aigrain, S.; Alonso, R. +46 more
In this paper, the CoRoT ExoplanetScience Team announces its 14th discovery. Herein, we discuss the observations and analyses that allowed us to derive the parameters of this system: a hot Jupiter with a mass of 7.6 ± 0.6 Jupiter masses orbiting a solar-type star (F9V) with a period of only 1.5 d, less than 5 stellar radii from its parent star. It…
Internal dynamics of Abell 2254: a merging galaxy cluster with a clumpy, diffuse radio emission
Gastaldello, F.; Nonino, M.; Bardelli, S. +3 more
Context. The mechanisms giving rise to diffuse radio emission in galaxy clusters and, in particular, their connection with cluster mergers are still being debated.
Aims: We explore the internal dynamics of Abell 2254, which has been shown to host a very clumpy and irregular radio halo.
Methods: Our analysis is mainly based on redshift da…
Tracing the energetics and evolution of dust with Spitzer: a chapter in the history of the Eagle Nebula
Boulanger, F.; Paladini, R.; Noriega-Crespo, A. +5 more
Context. The Spitzer GLIMPSE and MIPSGAL surveys have revealed a wealth of details about the Galactic plane in the infrared (IR) with orders of magnitude higher sensitivity, higher resolution, and wider coverage than previous IR observations. The structure of the interstellar medium (ISM) is tightly connected to the countless star-forming regions.…
The location of an active nucleus and a shadow of a tidal tail in the ULIRG Mrk 273
Veilleux, S.; Sanders, D. B.; Surace, J. A. +9 more
Analysis of data from the Chandra X-ray Observatory for the double nucleus ULIRG Mrk 273 reveals an absorbed hard X-ray source coincident with the southwest nucleus, implying that this unresolved, near-infrared source is where an active nucleus resides, while the northern nuclear region contains a powerful starburst that dominates the far infrared…
Discovery of gamma- and X-ray pulsations from the young and energetic PSR J1357-6429 with Fermi and XMM-Newton
Camilo, F.; Cohen-Tanugi, J.; Grondin, M. -H. +20 more
Context. Since the launch of the Fermi satellite, the number of known gamma-ray pulsars has increased tenfold. Most gamma-ray detected pulsars are young and energetic, and many are associated with TeV sources. PSR J1357-6429 is a high spin-down power pulsar (Ė = 3.1 × 1036 erg s-1), discovered during the Parkes multibeam surv…