Search Publications
Spatial and diurnal variation of water outgassing on comet 67P/Churyumov-Gerasimenko observed from Rosetta/MIRO in August 2014
Jorda, L.; Sierks, H.; Keller, H. U. +23 more
Aims: We present the spatial and diurnal variation of water outgassing on comet 67P/Churyumov-Gerasimenko using the HO rotational transition line at 556.936 GHz observed from Rosetta/MIRO in August 2014.
Methods: The water line was analyzed with a non-LTE radiative transfer model and an optimal estimation method to retrieve the HO outgas…
Cool dust heating and temperature mixing in nearby star-forming galaxies
Helou, G.; Boquien, M.; Bianchi, S. +20 more
Physical conditions of the interstellar medium in galaxies are closely linked to the ambient radiation field and the heating of dust grains. In order to characterize dust properties in galaxies over a wide range of physical conditions, we present here the radial surface brightness profiles of the entire sample of 61 galaxies from Key Insights into…
Exceptional AGN-driven turbulence inhibits star formation in the 3C 326N radio galaxy
Boulanger, F.; Falgarone, E.; Combes, F. +4 more
We detect bright [Cii]λ158 µm line emission from the radio galaxy 3C 326N at z = 0.09, which shows no sign of ongoing or recent star formation (SFR< 0.07 M⊙ yr-1) despite having strong H2 line emission and a substantial amount of molecular gas (2 × 109 M⊙, inferred from the modeling o…
Cosmography of OB stars in the solar neighbourhood
Bouy, H.; Alves, J.
We construct a 3D map of the spatial density of OB stars within 500 pc from the Sun using the Hipparcos catalogue and find three large-scale stream-like structures that allow a new view on the solar neighbourhood. The spatial coherence of these blue streams and the monotonic age sequence over hundreds of parsecs suggest that they are made of young…
The host galaxies of X-ray selected active galactic nuclei to z = 2.5: Structure, star formation, and their relationships from CANDELS and Herschel/PACS
Berta, S.; Magnelli, B.; Lutz, D. +60 more
We study the relationship between the structure and star formation rate (SFR) of X-ray selected low and moderate luminosity active galactic nuclei (AGNs) in the two Chandra Deep Fields, using Hubble Space Telescope imaging from the Cosmic Assembly Near Infrared Extragalactic Legacy Survey (CANDELS) and deep far-infrared maps from the PEP+GOODS-Her…
SINFONI spectra of heavily obscured AGNs in COSMOS: Evidence of outflows in a MIR/O target at z ~ 2.5
Berta, S.; Lutz, D.; Le Floc'h, E. +9 more
Aims: We present new data for four candidate obscured Compton-Thick (CT) quasars at z ~ 1-2.5 observed with the SINFONI VLT spectrograph in adaptive optics (AO) mode. These sources were selected from a 24 µm Spitzer MIPS survey of the COSMOS field, on the basis of red mid-infrared to optical and optical to near-infrared colours, with th…
Temporal morphological changes in the Imhotep region of comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +45 more
Aims: We report on the first major temporal morphological changes observed on the surface of the nucleus of comet 67P/Churyumov-Gerasimenko in the smooth terrains of the Imhotep region.
Methods: We used images of the OSIRIS cameras onboard Rosetta to follow the temporal changes from 24 May 2015 to 11 July 2015.
Results: The morpholo…
Massive stars on the verge of exploding: the properties of oxygen sequence Wolf-Rayet stars
Kaper, L.; de Mink, S. E.; de Koter, A. +7 more
Context. Oxygen sequence Wolf-Rayet (WO) stars are a very rare stage in the evolution of massive stars. Their spectra show strong emission lines of helium-burning products, in particular highly ionized carbon and oxygen. The properties of WO stars can be used to provide unique constraints on the (post-)helium burning evolution of massive stars, an…
Suzaku X-ray study of the double radio relic galaxy cluster CIZA J2242.8+5301
Kaastra, J. S.; van Weeren, R. J.; Brüggen, M. +7 more
Context. We present the results from Suzaku observations of the merging cluster of galaxies
Aims: To study the physics of gas heating and particle acceleration in cluster mergers, we investigated the X-ray emission from
Properties of solar plage from a spatially coupled inversion of Hinode SP data
Solanki, S. K.; Lagg, A.; van Noort, M. +1 more
Aims: The properties of magnetic fields forming an extended plage region in AR 10953 were investigated.
Methods: Stokes spectra of the Fe I line pair at 6302 Å recorded by the spectropolarimeter aboard the Hinode satellite were inverted using the SPINOR code. The code performed a 2D spatially coupled inversion on the Stokes spectra, allo…