Search Publications
Probing the 2D temperature structure of protoplanetary disks with Herschel observations of high-J CO lines
Fedele, D.; van Dishoeck, E. F.; Bruderer, S. +2 more
The gas temperature structure of protoplanetary disks is a key ingredient for interpreting various disk observations and for quantifying the subsequent evolution of these systems. The comparison of low- and mid-J CO rotational lines is a powerful tool for assessing the temperature gradient in the warm molecular layer of disks. Spectrally resolved …
Planck intermediate results. XL. The Sunyaev-Zeldovich signal from the Virgo cluster
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +202 more
The Virgo cluster is the largest Sunyaev-Zeldovich (SZ) source in the sky, both in terms of angular size and total integrated flux. Planck's wide angular scale and frequency coverage, together with its high sensitivity, enable a detailed study of this big object through the SZ effect. Virgo is well resolved by Planck, showing an elongated structur…
A model of short-lived outbursts on the 67P from fractured terrains
Keller, H. U.; Hartogh, P.; Rezac, L. +2 more
Aims: We develop a physical model to explain the potent outbursts that occurred in the fractured terrain of comet 67P near perihelion, and predict its temporal characteristics.
Methods: The feasibility of the proposed mechanism is studied using a numerical model accounting for the relevant microscopic/macroscopic processes. We rely on th…
Multi-wavelength characterisation of z ~ 2 clustered, dusty star-forming galaxies discovered by Planck
Le Floc'h, E.; Dole, H.; Lagache, G. +9 more
We report the discovery of PHz G95.5-61.6, a complex structure detected in emission in the Planck all-sky survey that corresponds to two over-densities of high-redshift (I.e. z> 1) galaxies. This is the first source from the Planck catalogue of high-z candidates (proto-clusters and lensed systems) that has been completely characterised with fol…
Cosmic microwave background reconstruction from WMAP and Planck PR2 data
Starck, J. -L.; Sureau, F.; Bobin, J.
We describe a new estimate of the cosmic microwave background (CMB) intensity map reconstructed by a joint analysis of the full Planck 2015 data (PR2) and nine years of WMAP data. The proposed map provides more than a mere update of the CMB map introduced in a previous paper since it benefits from an improvement of the component separation method …
Galactic cold cores. VII. Filament formation and evolution: Methods and observational constraints
Bernard, J. -P.; Juvela, M.; Marshall, D. J. +15 more
Context. The association of filaments with protostellar objects has made these structures a priority target in star formation studies. However, little is known about the link between filament properties and their local environment.
Aims: The datasets from the Herschel Galactic Cold cores key programme allow for a statistical study of filament…
Star-forming dwarf galaxies in the Virgo cluster: the link between molecular gas, atomic gas, and dust
Riguccini, L.; De Looze, I.; Hunt, L. K. +11 more
We present 12CO(1-0) and 12CO(2-1) observations of a sample of 20 star-forming dwarfs selected from the Herschel Virgo Cluster Survey, with oxygen abundances ranging from 12 + log (O / H) ~ 8.1 to 8.8. CO emission is observed in ten galaxies and marginally detected in another one. CO fluxes correlate with the FIR 250 µm…
Anisotropies in the HI gas distribution toward 3C 196
Kerp, J.; Kalberla, P. M. W.
Context. The local Galactic Hi gas was found to contain cold neutral medium (CNM) filaments that are aligned with polarized dust emission. These filaments appear to be dominated by the magnetic field and in this case turbulence is expected to show distinct anisotropies.
Aims: We use the Galactic Effelsberg-Bonn Hi Survey (EBHIS) to derive 2D …
Conditions for electron-cyclotron maser emission in the solar corona
Bloomfield, D. S.; Zucca, P.; Gallagher, P. T. +1 more
Context. The Sun is an active source of radio emission ranging from long duration radio bursts associated with solar flares and coronal mass ejections to more complex, short duration radio bursts such as solar S bursts, radio spikes and fibre bursts. While plasma emission is thought to be the dominant emission mechanism for most radio bursts, the …
Radical-induced chemistry from VUV photolysis of interstellar ice analogues containing formaldehyde
Danger, Grégoire; Chiavassa, Thierry; Duvernay, Fabrice +1 more
Surface processes and radical chemistry within interstellar ices are increasingly suspected to play an important role in the formation of complex organic molecules (COMs) observed in several astrophysical regions and cometary environments. We present new laboratory experiments on the low-temperature solid state formation of complex organic molecul…