Search Publications
Rapid and multiband variability of the TeV bright active nucleus of the galaxy IC 310
Maraschi, L.; Covino, S.; Antonelli, L. A. +159 more
Context. The radio galaxy IC 310 has recently been identified as a γ-ray emitter based on observations at GeV energies with Fermi-LAT and at very high energies (VHE, E > 100 GeV) with the MAGIC telescopes. Originally classified as a head-tail radio galaxy, the nature of this object is subject of controversy since its nucleus shows blazar-like b…
Gas and dust in the beta Pictoris moving group as seen by the Herschel Space Observatory
Pinte, C.; Duchêne, G.; Dent, W. R. F. +11 more
Context. Debris discs are thought to be formed through the collisional grinding of planetesimals, and then can be considered as the outcome of planet formation. Understanding the properties of gas and dust in debris discs can help us comprehend the architecture of extrasolar planetary systems. Herschel Space Observatory far-infrared (IR) photometr…
Vigorous convection in a sunspot granular light bridge
Lagg, Andreas; Solanki, Sami K.; Danilovic, Sanja +1 more
Context. Light bridges are the most prominent manifestation of convection in sunspots. The brightest representatives are granular light bridges composed of features that appear to be similar to granules.
Aims: An in-depth study of the convective motions, temperature stratification, and magnetic field vector in and around light bridge granules…
Formation of pebble-pile planetesimals
Johansen, Anders; Wahlberg Jansson, Karl
Asteroids and Kuiper belt objects are remnant planetesimals from the epoch of planet formation. The first stage of planet formation is the accumulation of dust and ice grains into mm- and cm-sized pebbles. These pebbles can clump together through the streaming instability and form gravitationally bound pebble clouds. Pebbles inside such a cloud wi…
Ultraviolet to infrared emission of z > 1 galaxies: Can we derive reliable star formation rates and stellar masses?
Morrison, G.; Buat, V.; Boquien, M. +6 more
Aims: Our knowledge of the cosmic mass assembly relies on measurements of star formation rates (SFRs) and stellar masses (Mstar), of galaxies as a function of redshift. These parameters must be estimated in a consistent way with a good knowledge of systematics before studying their correlation and the variation of the specific SFR.…
TANAMI blazars in the IceCube PeV-neutrino fields
Gehrels, N.; Thompson, D. J.; Wilms, J. +39 more
The IceCube Collaboration has announced the discovery of a neutrino flux in excess of the atmospheric background. Owing to the steeply falling atmospheric background spectrum, events at PeV energies most likely have an extraterrestrial origin. We present the multiwavelength properties of the six radio-brightest blazars that are positionally coinci…
Variation in the dust emissivity index across M 33 with Herschel and Spitzer (HerM 33es)
Boquien, M.; Braine, J.; van der Werf, P. +12 more
We study the wavelength dependence of the dust emission as a function of position and environment across the disk of M 33 using Spitzer and Herschel photometric data. M 33 is a Local Group spiral with slightly subsolar metallicity, which makes it an ideal stepping-stone to less regular and lower-metallicity objects such as dwarf galaxies and, prob…
Herschel view of the large-scale structure in the Chamaeleon dark clouds
Prusti, T.; Pilbratt, G. L.; André, Ph. +17 more
Context. The Chamaeleon molecular cloud complex is one of the nearest star-forming sites and encompasses three molecular clouds (Cha I, II, and III) that have a different star-formation history, from quiescent (Cha III) to actively forming stars (Cha II), and one that reaches the end of star-formation (Cha I).
Aims: We aim at characterising t…
LOFAR tied-array imaging of Type III solar radio bursts
Magdalenić, J.; McKean, J. P.; Eislöffel, J. +82 more
Context. The Sun is an active source of radio emission which is often associated with energetic phenomena such as solar flares and coronal mass ejections (CMEs). At low radio frequencies (<100 MHz), the Sun has not been imaged extensively because of the instrumental limitations of previous radio telescopes.
Aims: Here, the combined high sp…
Revisiting the transits of CoRoT-7b at a lower activity level
Aigrain, S.; Alonso, R.; Bordé, P. +29 more
The first super-Earth with measured radius discovered was CoRoT-7b and it has opened the new field of rocky exoplanet characterisation. To better understand this interesting system, new observations were taken with the CoRoT satellite. During this run 90 new transits were obtained in the imagette mode. These were analysed together with the previou…