Search Publications
The narrow Fe Kα line and the molecular torus in active galactic nuclei: an IR/X-ray view
Paltani, S.; Gandhi, P.; Stalevski, M. +5 more
The narrow component of the iron Kα is an almost ubiquitous feature in the X-ray spectra of active galactic nuclei (AGN) and is believed to originate in neutral material, possibly located in the molecular torus. This would imply a tight connection between the Fe Kα equivalent width (EW) and the physical properties of the torus. In a recent work we…
Detailed modelling of the circumstellar molecular line emission of the S-type AGB star W Aquilae
Olofsson, H.; Justtanont, K.; Lombaert, R. +5 more
Context. S-type AGB stars have a C/O ratio which suggests that they are transition objects between oxygen-rich M-type stars and carbon-rich C-type stars. As such, their circumstellar compositions of gas and dust are thought to be sensitive to their precise C/O ratio, and it is therefore of particular interest to examine their circumstellar propert…
Probing spatial homogeneity with LTB models: a detailed discussion
Bartelmann, M.; Lewis, G. F.; Meyer, S. +2 more
Do current observational data confirm the assumptions of the cosmological principle, or is there statistical evidence for deviations from spatial homogeneity on large scales? To address these questions, we developed a flexible framework based on spherically symmetric, but radially inhomogeneous Lemaître-Tolman-Bondi (LTB) models with synchronous B…
Mining the gap: evolution of the magnitude gap in X-ray galaxy groups from the 3-square-degree XMM coverage of CFHTLS
Finoguenov, A.; Popesso, P.; Salvato, M. +15 more
We present a catalog of 129 X-ray galaxy groups, covering a redshift range 0.04 <z< 1.23, selected in the ~3 deg2 part of the CFHTLS W1 field overlapping XMM observations performed under the XMM-LSS project. We carry out a statistical study of the redshift evolution out to redshift one of the magnitude gap between the first and th…
Spatially resolved kinematics, galactic wind, and quenching of star formation in the luminous infrared galaxy IRAS F11506-3851
Maiolino, R.; Colina, L.; Arribas, S. +4 more
We present a multi-wavelength integral field spectroscopic (IFS) study of the low-z luminous infrared galaxy IRAS F11506-3851 (ESO 320-G030) on the basis of the moderate spectral resolution observations (R ~ 3400-4000) taken with the VIMOS and SINFONI instruments at the ESO VLT. The morphology and the 2D kinematics of the gaseous (neutral and ioni…
Spatially-resolved dust properties of the GRB 980425 host galaxy
Berta, S.; Le Floc'h, E.; Covino, S. +30 more
Gamma-ray bursts (GRBs) have been proposed as a tool for studying star formation in the Universe, so it is crucial to investigate whether their host galaxies and immediate environments are in any way special compared with other star-forming galaxies. Here we present spatially resolved maps of dust emission of the host galaxyof the closest known GR…
Outflow of hot and cold molecular gas from the obscured secondary nucleus of NGC 3256: closing in on feedback physics
Colina, L.; Villar-Martín, M.; Arribas, S. +5 more
The nuclei of merging galaxies are often deeply buried in dense layers of gas and dust. In these regions, gas outflows driven by starburst and active galactic nuclear activity are believed to play a crucial role in the evolution of these galaxies. However, to fully understand this process it is essential to resolve the morphology and kinematics of…
Shockingly low water abundances in Herschel/PACS observations of low-mass protostars in Perseus
Fedele, D.; van Dishoeck, E. F.; Evans, N. J. +16 more
Context. Protostars interact with their surroundings through jets and winds impinging on the envelope and creating shocks, but the nature of these shocks is still poorly understood.
Aims: Our aim is to survey far-infrared molecular line emission from a uniform and significant sample of deeply-embedded low-mass young stellar objects (YSOs) in …
IPHAS and the symbiotic stars. III. New discoveries and their IR spectral energy distributions
Munari, U.; Corradi, R. L. M.; Santander-García, M. +5 more
Context. The IPHAS Hα survey provides a rich database to search for emission-line sources in the northern Galactic plane.
Aims: We are systematically searching for symbiotic stars in the Milky Way using IPHAS. Our final goal, a complete census of this class of objects in the Galaxy, is a fundamental figure for discussing their overall propert…
Monte Carlo modelling of the propagation and annihilation of nucleosynthesis positrons in the Galaxy
Jean, P.; Ferrière, K.; Alexis, A. +1 more
Aims: We want to estimate whether the positrons produced by the β+-decay of 26Al, 44Ti, and 56Ni synthesised in massive stars and supernovae are sufficient to explain the 511 keV annihilation emission observed in our Galaxy. Such a possibility has often been put forward in the past. In a previous st…