Search Publications
The first Frontier Fields cluster: 4.5 µm excess in a z ~ 8 galaxy candidate in Abell 2744
Kneib, J. -P.; Pérez-Fournon, I.; Schaerer, D. +10 more
Aims: We present in this letter the first analysis of a z ~ 8 galaxy candidate found in the Hubble and Spitzer imaging data of Abell 2744 as part of the Hubble Frontier Fields legacy program.
Methods: We applied the most commonly used methods to select exceptionally high-redshift galaxies by combining non-detection and color criteria usi…
Gaia photometry for white dwarfs
Jordi, C.; Luri, X.; Carrasco, J. M. +5 more
Context. White dwarfs can be used to study the structure and evolution of the Galaxy by analysing their luminosity function and initial mass function. Among them, the very cool white dwarfs provide the information for the early ages of each population. Because white dwarfs are intrinsically faint only the nearby (~ 20 pc) sample is reasonably comp…
The first submillimeter observation of CO in the stratosphere of Uranus
Fletcher, L. N.; Hartogh, P.; Lellouch, E. +8 more
Context. Carbon monoxide (CO) has been detected in all giant planets and its origin is both internal and external in Jupiter and Neptune. Despite its first detection in Uranus a decade ago, the magnitude of its internal and external sources remains unconstrained.
Aims: We targeted CO lines in Uranus in the submillimeter range to constrain its…
Correlations between the stellar, planetary, and debris components of exoplanet systems observed by Herschel
Ivison, R. J.; Olofsson, G.; Eiroa, C. +18 more
Context. Stars form surrounded by gas- and dust-rich protoplanetary discs. Generally, these discs dissipate over a few (3-10) Myr, leaving a faint tenuous debris disc composed of second-generation dust produced by the attrition of larger bodies formed in the protoplanetary disc. Giant planets detected in radial velocity and transit surveys of main…
Measurement of the TCMB evolution from the Sunyaev-Zel'dovich effect
Aghanim, N.; Douspis, M.; Hurier, G. +1 more
In the standard hot cosmological model, the black-body temperature of the cosmic microwave background (CMB), TCMB, increases linearly with redshift. Across the line of sight CMB photons interact with the hot (~ 107-8 K ) and diffuse gas of electrons from galaxy clusters. This interaction leads to the well-known thermal Sunyae…
Theoretical power spectra of mixed modes in low-mass red giant stars
Dupret, M. -A.; Samadi, R.; Mosser, B. +3 more
Context. CoRoT and Kepler observations of red giant stars revealed very rich spectra of non-radial solar-like oscillations. Of particular interest was the detection of mixed modes that exhibit significant amplitude, both in the core and at the surface of the stars. It opens the possibility of probing the internal structure from their innermost lay…
MAGIC long-term study of the distant TeV blazar PKS 1424+240 in a multiwavelength context
Maraschi, L.; Covino, S.; Antonelli, L. A. +170 more
Aims: We present a study of the very high-energy (VHE; E> 100 GeV) γ-ray emission of the blazar PKS 1424+240 observed with the MAGIC telescopes. The primary aim of this paper is the multiwavelength spectral characterization and modeling of this blazar, which is made particularly interesting by the recent discovery of a lower limit of its r…
On helium-dominated stellar evolution: the mysterious role of the O(He)-type stars
Rauch, T.; Werner, K.; Kruk, J. W. +2 more
Context. About a quarter of all post-asymptotic giant branch (AGB) stars are hydrogen-deficient. Stellar evolutionary models explain the carbon-dominated H-deficient stars by a (very) late thermal pulse scenario where the hydrogen-rich envelope is mixed with the helium-rich intershell layer. Depending on the particular time at which the final flas…
The dynamics and star-forming potential of the massive Galactic centre cloud G0.253+0.016
Henning, Th.; Beuther, H.; Linz, H. +3 more
Context. The massive infrared dark cloud G0.253+0.016 projected ~45 pc from the Galactic centre contains ~105 M⊙ of dense gas whilst being mostly devoid of observed star-formation tracers.
Aims: Our goals are therefore to scrutinise the physical properties, dynamics and structure of this cloud with reference to its star-…
Long-period intensity pulsations in the solar corona during activity cycle 23
Auchère, F.; Bocchialini, K.; Solomon, J. +1 more
We report on the detection (10σ) of 917 events of long-period (3 to 16 h) intensity pulsations in the 19.5 nm passband of the SOHO Extreme ultraviolet Imaging Telescope. The data set spans from January 1997 to July 2010, i.e. the entire solar cycle 23 and the beginning of cycle 24. The events can last for up to six days and have relative amplitude…