Search Publications
The XMM-LSS survey: optical assessment and properties of different X-ray selected cluster classes
Maccagni, D.; Chiappetti, L.; Altieri, B. +29 more
Context. XMM and Chandra opened a new area for the study of clusters of galaxies not only for cluster physics, but also for the detection of faint and distant clusters that were inaccessible with previous missions.
Aims: This article presents 66 spectroscopically confirmed clusters (0.05 ≤ z ≤ 1.5) within an area of 6 deg2 enclosed…
The bolometric output and host-galaxy properties of obscured AGN in the XMM-COSMOS survey
Treister, E.; Merloni, A.; Bolzonella, M. +15 more
We present a study of the multi-wavelength properties, from the mid-infrared to the hard X-rays, of a sample of 255 spectroscopically identified X-ray selected type-2 AGN from the XMM-COSMOS survey. Most of them are obscured and the X-ray absorbing column density is determined by either X-ray spectral analyses (for 45% of the sample), or from hard…
A critical analysis of the UV luminosity function at redshift ~7 from deep WFC3 data
Giavalisco, M.; Castellano, M.; Pentericci, L. +7 more
Context. The study of the luminosity function (LF) of Lyman break galaxies (LBGs) at z = 7 is very important for ascertaining their role in the reionization of the Universe. These galaxies can be used also to investigate in detail the processes of formation and evolution of galactic structures in the infancy of our Universe.
Aims: In this wor…
Direct detection of the Enceladus water torus with Herschel
Hartogh, P.; Lellouch, E.; Crovisier, J. +9 more
Cryovolcanic activity near the south pole of Saturn's moon Enceladus produces plumes of H2O-dominated gases and ice particles, which escape and populate a torus-shaped cloud. Using submillimeter spectroscopy with Herschel, we report the direct detection of the Enceladus water vapor torus in four rotational lines of water at 557, 987, 11…
The unusual protoplanetary disk around the T Tauri star ET Chamaeleontis
Ménard, F.; Duchêne, G.; Dent, W. R. F. +15 more
We present new continuum and line observations, along with modelling, of the faint (6-8) Myr old T Tauri star ET Cha belonging to the η Chamaeleontis cluster. We have acquired Herschel/PACS photometric fluxes at 70 µm and 160 µm, as well as a detection of the [OI] 63 µm fine-structure line in emission, and derived upper limits fo…
η Carinae: a very large hadron collider
Farnier, C.; Walter, R.; Leyder, J. -C.
Context. η Carinae is the colliding wind binary with the highest mass-loss rate in our Galaxy and the only one in which hard X-ray emission has been detected.
Aims: η Carinae is therefore a primary candidate to search for particle acceleration by probing its gamma-ray emission.
Methods: We used the first 21 months of Fermi/LAT data to ex…
A large population of ultra-compact dwarf galaxies in the Hydra I cluster
Hilker, M.; Georgiev, I. Y.; Richtler, T. +3 more
Aims: We performed a large spectroscopic survey of compact, unresolved objects in the core of the Hydra I galaxy cluster (Abell 1060), with the aim of identifying ultra-compact dwarf galaxies (UCDs) and investigating the properties of the globular cluster (GC) system around the central cD galaxy NGC 3311.
Methods: We obtained VIMOS mediu…
Integral field spectroscopy of nitrogen overabundant blue compact dwarf galaxies
Kehrig, C.; Pérez-Montero, E.; Vílchez, J. M. +6 more
Context. The oxygen and nitrogen-to-oxygen abundances relation is characterized by a plateau around log(N/O) = -1.6 at metallicities lower than 12+log(O/H) ~ 8.25. However, there is a subset of blue compact dwarf galaxies (BCDs) with unexpectedly high N/O values.
Aims: We want to study the spatial distribution of the physical properties and o…
Galactic cold cores. II. Herschel study of the extended dust emission around the first Planck detections
Abergel, A.; Bernard, J. -P.; Dickinson, C. +15 more
Context. Within the project Galacticcoldcores we are carrying out Herschel photometric observations of cold interstellar clouds detected with the Planck satellite. The three fields observed as part of the Herschel science demonstration phase (SDP) provided the first glimpse into the nature of these sources. The aim of the project is to derive the …
Excitation of H2 in photodissociation regions as seen by Spitzer
Boulanger, F.; Abergel, A.; Le Bourlot, J. +5 more
Aims: We present spectroscopic observations obtained with the infrared Spitzer Space Telescope, which provide insight into the H2 physics and gas energetics in photodissociation regions (PDRs) of low to moderate far-ultraviolet (FUV) fields and densities.
Methods: We analyze data on six well known Galactic PDRs (L1721, Califor…