Search Publications
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,…
Discovery of a rich proto-cluster at z = 2.9 and associated diffuse cold gas in the VIMOS Ultra-Deep Survey (VUDS)
Maccagni, D.; Cimatti, A.; Ilbert, O. +42 more
High-density environments are crucial places for studying the link between hierarchical structure formation and stellar mass growth in galaxies. In this work, we characterise a massive proto-cluster at z = 2.895 that we found in the COSMOS field using the spectroscopic sample of the VIMOS Ultra-Deep Survey (VUDS). This is one of the rare structure…
The extended ROSAT-ESO Flux Limited X-ray Galaxy Cluster Survey (REFLEX II). IV. X-ray luminosity function and first constraints on cosmological parameters
Collins, Chris A.; Böhringer, Hans; Chon, Gayoung
The X-ray luminosity function that is closely related to the cluster mass function is an important statistic of the census of galaxy clusters in our Universe. It is also an important means to probe the cosmological model of our Universe. Based on our recently completed REFLEX II cluster sample comprising 910 galaxy clusters with redshifts we const…
JKCS 041: a Coma cluster progenitor at z = 1.803
Andreon, S.; Treu, T.; Newman, A. B. +3 more
Using deep two-color near-infrared HST imaging and unbiased grism spectroscopy, we present a detailed study of the z = 1.803 JKCS 041 cluster. We confirm, for the first time for a high-redshift cluster, a mass of log M ≳ 14.2 in solar units using four different techniques based on the X-ray temperature, the X-ray luminosity, the gas mass, and the …