Search Publications
Planck 2013 results. VII. HFI time response and beams
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +220 more
This paper characterizes the effective beams, the effective beam window functions and the associated errors for the Planck High Frequency Instrument (HFI) detectors. The effective beam is theangular response including the effect of the optics, detectors, data processing and the scan strategy. The window function is the representation of this beam …
Thermal desorption of circumstellar and cometary ice analogs
Martín-Doménech, R.; Muñoz Caro, G. M.; Bueno, J. +1 more
Context. Thermal annealing of interstellar ices takes place in several stages of star formation. Knowledge of this process comes from a combination of astronomical observations and laboratory simulations under astrophysically relevant conditions.
Aims: For the first time we present the results of temperature programmed desorption (TPD) experi…
The VLT-FLAMES Tarantula Survey. XIV. The O-type stellar content of 30 Doradus
Lennon, D. J.; Simón-Díaz, S.; de Koter, A. +6 more
Detailed spectral classifications are presented for 352 O-B0 stars in the VLT-FLAMES Tarantula Survey ESO Large Programme, of which 213 O-type are judged of sufficiently high quality for further morphological analysis. Among them, six subcategories of special interest are distinguished. (1) Several new examples of the earliest spectral types O2-O3…
Dust in the diffuse interstellar medium. Extinction, emission, linear and circular polarisation
Siebenmorgen, R.; Bagnulo, S.; Voshchinnikov, N. V.
We present a model for the diffuse interstellar dust that explains the observed wavelength-dependence of extinction, emission, and the linear and circular polarisation of light. The model is set up with a small number of parameters. It consists of a mixture of amorphous carbon and silicate grains with sizes from the molecular domain of 0.5 up to a…
Secular- and merger-built bulges in barred galaxies
Corsini, E. M.; Aguerri, J. A. L.; Méndez-Abreu, J. +1 more
Context. Historically, galaxy bulges were thought to be single-component objects at the center of galaxies. However, this picture is now questioned since different bulge types with different formation paths, namely classical and pseudobulges, have been found coexisting within the same galaxy.
Aims: We study the incidence and nature of composi…
Planck 2013 results. XIV. Zodiacal emission
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +229 more
The Planck satellite provides a set of all-sky maps at nine frequencies from 30 GHz to 857 GHz. Planets, minor bodies, and diffuse interplanetary dust emission (IPD) are all observed. The IPD can be separated from Galactic and other emissions because Planck views a given point on the celestial sphere multiple times, through different columns of IP…
The SPoCA-suite: Software for extraction, characterization, and tracking of active regions and coronal holes on EUV images
Verbeeck, C.; Delouille, V.; Mampaey, B. +1 more
Context. Precise localization and characterization of active regions (AR) and coronal holes (CH) as observed by extreme ultra violet (EUV) imagers are crucial for a wide range of solar and helio-physics studies.
Aims: We introduce a set of segmentation procedures (known as the SPoCA-suite) that allows one to retrieve AR and CH properties on E…
Interstellar chemistry of nitrogen hydrides in dark clouds
Maret, S.; Hily-Blant, P.; Pineau des Forêts, G. +3 more
Nitrogen, amongst the most abundant metals in the interstellar medium, has a peculiar chemistry that differs from those of carbon and oxygen. Recent observations of several nitrogen-bearing species in the interstellar medium suggest abundances in sharp disagreement with current chemical models. Although some of these observations show that some ga…
High-resolution, 3D radiative transfer modeling. I. The grand-design spiral galaxy M 51
Lebouteiller, Vianney; Wilson, Christine D.; De Looze, Ilse +20 more
Context. Dust reprocesses about half of the stellar radiation in galaxies. The thermal re-emission by dust of absorbed energy is considered to be driven merely by young stars so is often applied to tracing the star formation rate in galaxies. Recent studies have argued that the old stellar population might be responsible for a non-negligible fract…
Rapidly growing black holes and host galaxies in the distant Universe from the Herschel Radio Galaxy Evolution Project
Stern, D.; Bauer, F. E.; Ibar, E. +14 more
We present results from a comprehensive survey of 70 radio galaxies at redshifts 1 <z< 5.2 using the PACS and SPIRE instruments on board the Herschel Space Observatory. Combined with existing mid-IR photometry from the Spitzer Space Telescope, published 870 µm photometry, and new observations obtained with LABOCA on the APEX telescope,…