Search Publications
Cool circumgalactic gas of passive galaxies from cosmological inflow
Afruni, Andrea; Fraternali, Filippo; Pezzulli, Gabriele
The circumgalactic medium (CGM) of galaxies consists of a multi-phase gas with components at very different temperatures, from 104 K to 107 K. One of the greatest puzzles about this medium is the presence of a large amount of low-temperature (T ∼ 104 K) gas around quiescent early-type galaxies (ETGs). Using semi-an…
Dust properties and star formation of approximately a thousand local galaxies
Barmby, P.; Lehnert, M.; Lianou, S. +2 more
Aims: We derived the dust properties for 753 local galaxies and examine how these relate to some of their physical properties. We present the derived dust emission properties, including model spectral energy distribution (SEDs), star formation rates (SFRs) and stellar masses, as well as their relations.
Methods: We modelled the global du…
X-ray spectra of the Fe-L complex
Raassen, A. J. J.; Gu, Liyi; Mao, Junjie +7 more
The Hitomi results on the Perseus cluster have led to improvements in our knowledge of atomic physics that are crucial for the precise diagnostic of hot astrophysical plasma observed with high-resolution X-ray spectrometers. However, modeling uncertainties remains, both within but especially beyond Hitomi's spectral window. A major challenge in sp…
Tracing Hercules in Galactic azimuth with Gaia DR2
Monari, G.; Siebert, A.; Famaey, B. +4 more
The second data release of the Gaia mission has revealed, in stellar velocity and action space, multiple ridges, the exact origin of which is still debated. Recently, we demonstrated that a large Galactic bar with pattern speed 39 km s-1 kpc-1 creates most of the observed ridges. Among these ridges, the Hercules moving group …
Organic molecules in the protoplanetary disk of DG Tauri revealed by ALMA
Kamp, I.; Podio, L.; Bacciotti, F. +10 more
Context. Planets form in protoplanetary disks and inherit their chemical compositions.
Aims: It is thus crucial to map the distribution and investigate the formation of simple organics, such as formaldehyde and methanol, in protoplanetary disks.
Methods: We analyze ALMA observations of the nearby disk-jet system around the T Tauri star D…
Discovery of a galaxy overdensity around a powerful, heavily obscured FRII radio galaxy at z = 1.7: star formation promoted by large-scale AGN feedback?
Prandoni, I.; Vignali, C.; Gilli, R. +25 more
We report the discovery of a galaxy overdensity around a Compton-thick Fanaroff-Riley type II (FRII) radio galaxy at z = 1.7 in the deep multiband survey around the z = 6.3 quasi-stellar object (QSO) SDSS J1030+0524. Based on a 6 h VLT/MUSE and on a 4 h LBT/LUCI observation, we identify at least eight galaxy members in this structure with spectros…
The VLT-FLAMES Tarantula Survey. XXXI. Radial velocities and multiplicity constraints of red supergiant stars in 30 Doradus
van Loon, J. Th.; Lennon, D. J.; Herrero, A. +10 more
Aims: The incidence of multiplicity in cool, luminous massive stars is relatively unknown compared to their hotter counterparts. In this work we present radial velocity (RV) measurements and investigate the multiplicity properties of red supergiants (RSGs) in the 30 Doradus region of the Large Magellanic Cloud using multi-epoch visible spectr…
Oxygen isotopic ratios in Martian water vapour observed by ACS MIR on board the ExoMars Trace Gas Orbiter
Grigoriev, A.; Montmessin, F.; Korablev, O. +10 more
Oxygen isotope ratios provide important constraints on the history of the Martian volatile system, revealing the impact of several processes that might fractionate them, such as atmospheric loss into space or interaction with the surface. We report infrared measurements of the Martian atmosphere obtained with the mid-infrared channel (MIR) of the …
Evolutionary phases of merging clusters as seen by LOFAR
Brunetti, G.; Shimwell, T. W.; Cassano, R. +13 more
Massive, merging galaxy clusters often host giant, diffuse radio sources that arise from shocks and turbulence; hence, radio observations can be useful for determining the merger state of a cluster. In preparation for a larger study, we selected three clusters - Abell 1319, Abell 1314, and RXC J1501.3+4220 (Z7215) - making use of the new LOFAR Two…
Spatially resolved spectroscopy of the debris disk HD 32297. Further evidence of small dust grains
Augereau, J. -C.; Pantin, E.; Henning, T. +14 more
Context. Spectro-photometry of debris disks in total intensity and polarimetry can provide new insight into the properties of the dust grains therein (size distribution and optical properties).
Aims: We aim to constrain the morphology of the highly inclined debris disk HD 32297. We also intend to obtain spectroscopic and polarimetric measurem…