Search Publications
CSI 2264: Probing the inner disks of AA Tauri-like systems in NGC 2264
Aigrain, S.; Dougados, C.; Bouvier, J. +20 more
Context. The classical T Tauri star (CTTS) AA Tau has presented photometric variability that was attributed to an inner disk warp, caused by the interaction between the inner disk and an inclined magnetosphere. Previous studies of the young cluster NGC 2264 have shown that similar photometric behavior is common among CTTS.
Aims: The goal of t…
Planck intermediate results. XXIV. Constraints on variations in fundamental constants
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +167 more
Any variation in the fundamental physical constants, more particularly in the fine structure constant, α, or in the mass of the electron, me, affects the recombination history of the Universe and cause an imprint on the cosmic microwave background angular power spectra. We show that the Planck data allow one to improve the constraint on…
Planck's dusty GEMS: The brightest gravitationally lensed galaxies discovered with the Planck all-sky survey
Kneissl, R.; Altieri, B.; Le Floc'h, E. +30 more
We present an analysis of CO spectroscopy and infrared-to-millimetre dust photometry of 11 exceptionally bright far-infrared (FIR) and sub-mm sources discovered through a combination of the Planck all-sky survey and follow-up Herschel-SPIRE imaging - "Planck's Dusty Gravitationally Enhanced subMillimetre Sources". Each source has a secure spectros…
Molecular clouds have power-law probability distribution functions
Alves, João; Lada, Charles J.; Lombardi, Marco
In this Letter we investigate the shape of the probability distribution of column densities (PDF) in molecular clouds. Through the use of low-noise, extinction-calibrated Herschel/Planck emission data for eight molecular clouds, we demonstrate that, contrary to common belief, the PDFs of molecular clouds are not described well by log-normal functi…
Excitation of kink oscillations of coronal loops: statistical study
Zimovets, I. V.; Nakariakov, V. M.
Context. Solar flares are often accompanied by kink (transverse) oscillations of coronal loops. Despite intensive study of these oscillations in recent years, the mechanisms that excite them are still not known.
Aims: We aim to clarify the excitation mechanisms for these kink oscillations of coronal loops.
Methods: We analysed 58 kink-os…
Wolf-Rayet stars in the Small Magellanic Cloud. I. Analysis of the single WN stars
Sander, A.; Hamann, W. -R.; Shenar, T. +3 more
Context. Wolf-Rayet (WR) stars have a severe impact on their environments owing to their strong ionizing radiation fields and powerful stellar winds. Since these winds are considered to be driven by radiation pressure, it is theoretically expected that the degree of the wind mass-loss depends on the initial metallicity of WR stars.
Aims: Foll…
Planck intermediate results. XXIII. Galactic plane emission components derived from Planck with ancillary data
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +189 more
Planck data when combined with ancillary data provide a unique opportunity to separate the diffuse emission components of the inner Galaxy. The purpose of the paper is to elucidate the morphology of the various emission components in the strong star-formation region lying inside the solar radius and to clarify the relationship between the various …
Size-frequency distribution of boulders ≥7 m on comet 67P/Churyumov-Gerasimenko
Bertaux, Jean-Loup; Da Deppo, Vania; Naletto, Giampiero +55 more
Aims: We derive for the first time the size-frequency distribution of boulders on a comet, 67P/Churyumov-Gerasimenko (67P), computed from the images taken by the Rosetta/OSIRIS imaging system. We highlight the possible physical processes that lead to these boulder size distributions.
Methods: We used images acquired by the OSIRIS Narrow …
The truncated and evolving inner accretion disc of the black hole GX 339-4
Ponti, G.; Fender, R. P.; Muñoz-Darias, T. +2 more
The nature of accretion onto stellar mass black holes in the low/hard state remains unresolved, with some evidence suggesting that the inner accretion disc is truncated and replaced by a hot flow. However, the detection of relativistic broadened Fe emission lines, even at relatively low luminosities, seems to require an accretion disc extending fu…
Extreme emission-line galaxies out to z ~ 1 in zCOSMOS. I. Sample and characterization of global properties
Kneib, J. -P.; Silverman, J. D.; Bolzonella, M. +37 more
Context. The study of large and representative samples of low-metallicity star-forming galaxies at different cosmic epochs is of great interest to the detailed understanding of the assembly history and evolution of low-mass galaxies.
Aims: We present a thorough characterization of a large sample of 183 extreme emission-line galaxies (EELGs) a…