Search Publications
Photoionized emission and absorption features in the high-resolution X-ray spectra of NGC 3783
Kaastra, J. S.; Kriss, G. A.; Arav, N. +14 more
Our Swift monitoring program triggered two joint XMM-Newton, NuSTAR, and HST observations on 11 and 21 December 2016 targeting NGC 3783 because its soft X-ray continuum was heavily obscured. Consequently, emission features, including the O VII radiative recombination continuum, stand out above the diminished continuum. We focus on the photoionized…
16O/18O ratio in water in the coma of comet 67P/Churyumov-Gerasimenko measured with the Rosetta/ROSINA double-focusing mass spectrometer
De Keyser, Johan; Gombosi, Tamas I.; Berthelier, Jean-Jacques +11 more
The European Space Agency spacecraft Rosetta accompanied the Jupiter-family comet 67P/Churyumov-Gerasimenko for over 2 yr along its trajectory through the inner solar system. Between 2014 and 2016, it performed almost continuous in situ measurements of the comet's gaseous atmosphere in close proximity to its nucleus. In this study, the 16
Ruprecht 147 DANCe. I. Members, empirical isochrone, luminosity, and mass distributions
Tamura, M.; Bertin, E.; Miret-Roig, N. +10 more
Context. Ruprecht 147 is the oldest (2.5 Gyr) open cluster in the solar vicinity (< 300 pc), making it an important target for stellar evolution studies and exoplanet searches.
Aims: We aim to derive a census of members and the luminosity, mass, and spatial distributions of the cluster.
Methods: We used an astro-photometric data set i…
Variable emission mechanism of a Type IV radio burst
Kilpua, E. K. J.; Monstein, C.; Morosan, D. E. +1 more
Context. The Sun is an active star and the source of the largest explosions in the solar system, such as flares and coronal mass ejections (CMEs). Flares and CMEs are powerful particle accelerators that can generate radio emission through various emission mechanisms.
Aims: CMEs are often accompanied by Type IV radio bursts that are observed a…
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…