Search Publications
Star formation histories in mergers: the spatially resolved properties of the early-stage merger luminous infrared galaxies IC 1623 and NGC 6090
González Delgado, R. M.; Di Matteo, P.; Sánchez, S. F. +8 more
The role of major mergers in galaxy evolution is investigated through a detailed characterization of the stellar populations, ionized gas properties and star formation rates (SFR) in the early-stage merger luminous infrared galaxies (LIRGs) IC 1623 W and NGC 6090, by analysing optical integral field spectroscopy and high-resolution Hubble Space Te…
Chandra monitoring of the Galactic Centre magnetar SGR J1745-2900 during the initial 3.5 years of outburst decay
Campana, S.; Tiengo, A.; Mereghetti, S. +15 more
We report on 3.5 yr of Chandra monitoring of the Galactic Centre magnetar SGR J1745-2900 since its outburst onset in 2013 April. The magnetar spin-down has shown at least two episodes of period derivative increases so far, and it has slowed down regularly in the past year or so. We observed a slightly increasing trend in the time evolution of the …
Spontaneous generation of bending waves in isolated Milky Way-like discs
Widrow, Lawrence M.; Chequers, Matthew H.
We study the spontaneous generation and evolution of bending waves in N-body simulations of two isolated Milky Way-like galaxy models. The models differ by their disc-to-halo mass ratios, and hence by their susceptibility to the formation of a bar and spiral structure. Seeded from shot noise in the particle distribution, bending waves rapidly form…
The pulsating magnetosphere of the extremely slowly rotating magnetic β Cep star ξ1 CMa
Rivinius, Th.; Wade, G. A.; Neiner, C. +4 more
ξ1 CMa is a monoperiodically pulsating, magnetic β Cep star with magnetospheric X-ray emission that, uniquely amongst magnetic stars, is clearly modulated with the star's pulsation period. The rotational period Prot has yet to be identified, with multiple competing claims in the literature. We present an analysis of a large E…
Electron heat flux instability
Lazar, M.; Yoon, P. H.; Saeed, Sundas +2 more
The heat flux instability is an electromagnetic mode excited by a relative drift between the protons and two-component core-halo electrons. The most prominent application may be in association with the solar wind where drifting electron velocity distributions are observed. The heat flux instability is somewhat analogous to the electrostatic Bunema…
Ion composition at comet 67P near perihelion: Rosetta observations and model-based interpretation
Altwegg, K.; Balsiger, H.; Fuselier, S. A. +22 more
We present the ion composition in the coma of comet 67P with newly detected ion species over the 28-37 u mass range, probed by Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA)/Double Focusing Mass Spectrometer (DFMS). In summer 2015, the nucleus reached its highest outgassing rate and ion-neutral reactions started to take place a…
Distribution functions for resonantly trapped orbits in the Galactic disc
Binney, James; Famaey, Benoit; Monari, Giacomo +1 more
The present-day response of a Galactic disc stellar population to a non-axisymmetric perturbation of the potential has previously been computed through perturbation theory within the phase-space coordinates of the unperturbed axisymmetric system. Such an Eulerian linearized treatment, however, leads to singularities at resonances, which prevent qu…
An automatic approach to exclude interlopers from asteroid families
Radović, Viktor; Novaković, Bojan; Carruba, Valerio +1 more
Asteroid families are a valuable source of information to many asteroid-related researches, assuming a reliable list of their members could be obtained. However, as the number of known asteroids increases fast it becomes more and more difficult to obtain a robust list of members of an asteroid family. Here, we are proposing a new approach to deal …
Precise strong lensing mass profile of the CLASH galaxy cluster MACS 2129
Zitrin, A.; Grillo, C.; Balestra, I. +12 more
We present a detailed strong lensing (SL) mass reconstruction of the core of the galaxy cluster MACS J2129.4-0741 (zcl = 0.589) obtained by combining high-resolution Hubble Space Telescope photometry from the CLASH (Cluster Lensing And Supernovae survey with Hubble) survey with new spectroscopic observations from the CLASH-VLT (Very Lar…
Effective ion speeds at ∼200-250 km from comet 67P/Churyumov-Gerasimenko near perihelion
Nilsson, H.; André, M.; Goetz, C. +13 more
In 2015 August, comet 67P/Churyumov-Gerasimenko, the target comet of the ESA Rosetta mission, reached its perihelion at ∼1.24 au. Here, we estimate for a three-day period near perihelion, effective ion speeds at distances ∼200-250 km from the nucleus. We utilize two different methods combining measurements from the Rosetta Plasma Consortium (RPC)/…