Search Publications
GOODS-Herschel: dust attenuation properties of UV selected high redshift galaxies
Elbaz, D.; Dickinson, M.; Pannella, M. +9 more
Context. Dust attenuation in galaxies is poorly known, especially at high redshift. And yet the amount of dust attenuation is a key parameter to deduce accurate star formation rates from ultraviolet (UV) rest-frame measurements. The wavelength dependence of the dust attenuation is also of fundamental importance to interpret the observed spectral e…
Star-formation laws in luminous infrared galaxies. New observational constraints on models
Colina, L.; Planesas, P.; Arribas, S. +5 more
Context. The observational study of star-formation relations in galaxies is central for unraveling the related physical processes that are at work on local and global scales. It is still debated whether star formation can be described by a universal law that remains valid in different populations of galaxies.
Aims: We aim to expand the sample…
Age and helium content of the open cluster NGC 6791 from multiple eclipsing binary members. II. Age dependencies and new insights
Grundahl, F.; Milone, A. P.; Stello, D. +11 more
Context. Models of stellar structure and evolution can be constrained by measuring accurate parameters of detached eclipsing binaries in open clusters. Multiple binary stars provide the means to determine helium abundances in these old stellar systems, and in turn, to improve estimates of their age.
Aims: In the first paper of this series, we…
Faint high-redshift AGN in the Chandra deep field south: the evolution of the AGN luminosity function and black hole demography
Pannella, M.; Fiore, F.; Castellano, M. +14 more
Context. We present detection and analysis of faint X-ray sources in the Chandra deep field south (CDFS) using the 4 Ms Chandra observation.
Aims: We place constraints on active galactic nuclei (AGN) luminosity functions at z = 3-7, its cosmological evolution, and high-redshift black hole and AGN demography.
Methods: We use a new detecti…
Herschel/PACS spectroscopy of NGC 4418 and Arp 220: H2O, H218O, OH, 18OH, O I, HCN, and NH3
Lutz, D.; Genzel, R.; Poglitsch, A. +14 more
Full range Herschel/PACS spectroscopy of the (ultra)luminous infrared galaxies NGC 4418 and Arp 220, observed as part of the SHINING key programme, reveals high excitation in H2O, OH, HCN, and NH3. In NGC 4418, absorption lines were detected with Elower > 800 K (H2O), 600 K (OH), 1075 K (HCN), and 600…
Properties of Galactic early-type O-supergiants. A combined FUV-UV and optical analysis
Bouret, J. -C.; Hillier, D. J.; Fullerton, A. W. +1 more
Aims: We aim to constrain the properties and evolutionary status of early and mid-spectral type supergiants (from O4 to O7.5). These posses the highest mass-loss rates among the O stars, and exhibit conspicuous wind profiles.
Methods: Using the non-LTE wind code cmfgen we simultaneously analyzed the FUV-UV and optical spectral range to d…
A multi-scale, multi-wavelength source extraction method: getsources
André, Ph.; Schneider, N.; Men'shchikov, A. +3 more
We present a multi-scale, multi-wavelength source extraction algorithm called getsources. Although it has been designed primarily for use in the far-infrared surveys of Galactic star-forming regions with Herschel, the method can be applied to many other astronomical images. Instead of the traditional approach of extracting sources in the observed …
Hint of a transiting extended atmosphere on 55 Cancri b
Moutou, C.; Bonfils, X.; Ehrenreich, D. +9 more
The naked-eye star
The dominant role of mergers in the size evolution of massive early-type galaxies since z ~ 1
Kneib, J. -P.; Aussel, H.; Cimatti, A. +60 more
Aims: The role of galaxy mergers in massive galaxy evolution, and in particular to mass assembly and size growth, remains an open question. In this paper we measure the merger fraction and rate, both minor and major, of massive early-type galaxies (M ⋆ ≥ 1011 M⊙) in the COSMOS field, and study their role in m…
Observations of Herbig Ae/Be stars with Herschel/PACS. The atomic and molecular contents of their protoplanetary discs
Pinte, C.; Ménard, F.; Dent, W. R. F. +15 more
We observed a sample of 20 representative Herbig Ae/Be stars and 5 A-type debris discs with PACS onboard Herschel, as part of the GAS in Protoplanetary Systems (GASPS) project. The observations were done in spectroscopic mode, and cover the far-infrared lines of [O i], [C ii], CO, CH+, H2O, and OH. We have a [O i] 63 µm…