Search Publications
Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars
Gontcharov, George A.; Mosenkov, Aleksandr V.
We compare eight sources of reddening and extinction estimates for approximately 60 000 Gaia DR1 Tycho-Gaia Astrometric Solution (TGAS) main sequence stars younger than 3 Gyr with a relative error of the Gaia parallax less than 0.1. For the majority of the stars, the best 2D dust emission-based reddening maps show considerable differences between …
Massive 70 µm quiet clumps I: evidence of embedded low/intermediate-mass star formation activity
Peretto, N.; Schisano, E.; Billot, N. +5 more
Massive clumps, prior to the formation of any visible protostars, are the best candidates to search for the elusive massive starless cores. In this work, we investigate the dust and gas properties of massive clumps selected to be 70 µm quiet, therefore good starless candidates. Our sample of 18 clumps has masses 300 ≲ M ≲ 3000 M⊙,…
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 …