Search Publications
External gas accretion provides a fresh gas supply to the active S0 galaxy NGC 5077
Raimundo, S. I.
In early-type galaxies, externally accreted gas is thought to be the main source of gas replenishment at late times. We use MUSE integral field spectroscopy data to study the active S0 galaxy NGC 5077, which is known to have disturbed dynamics that are indicative of a past external interaction. We confirm the presence of a stellar kinematically di…
Rossby numbers and stiffness values inferred from gravity-mode asteroseismology of rotating F- and B-type dwarfs. Consequences for mixing, transport, magnetism, and convective penetration
Aerts, C.; Mathis, S.; Van Reeth, T. +5 more
Context. Multi-dimensional (magneto-)hydrodynamical simulations of physical processes in stellar interiors depend on a multitude of uncalibrated free parameters, which set the spatial and time scales of their computations.
Aims: We aim to provide an asteroseismic calibration of the wave and convective Rossby numbers, and of the stiffness at t…
Diagnosing the interstellar medium of galaxies with far-infrared emission lines. I. The [C II] 158 µm line at z ∼ 0
Wang, L.; van der Tak, F. F. S.; Trager, S. C. +2 more
Context. Atomic fine structure lines have been detected in the local Universe and at high redshifts over the past decades. The [C II] emission line at 158 µm is an important observable as it provides constraints on the interstellar medium (ISM) cooling processes.
Aims: We develop a physically motivated framework to simulate the producti…
The active region source of a type III radio storm observed by Parker Solar Probe during encounter 2
Barczynski, K.; Mandrini, C. H.; Bale, S. D. +6 more
Context. We investigated the source of a type III radio burst storm during encounter 2 of NASA's Parker Solar Probe (PSP) mission.
Aims: It was observed that in encounter 2 of NASA's PSP mission there was a large amount of radio activity and, in particular, a noise storm of frequent, small type III bursts from 31 March to 6 April 2019. Our ai…
A kinematic study of central compact objects and their host supernova remnants
Becker, Werner; Mayer, Martin G. F.
Context. Central compact objects (CCOs) are a peculiar class of neutron stars, primarily encountered close to the center of young supernova remnants (SNRs) and characterized by thermal X-ray emission. Measurements of their proper motion and the expansion of the parent SNR are powerful tools for constraining explosion kinematics and the age of the …
Hubble spectroscopy of LB-1: Comparison with B+black-hole and Be+stripped-star models
Smartt, S. J.; Dufton, P. L.; Lennon, D. J. +10 more
Context. LB-1 (alias ALS 8775) has been proposed as either an X-ray dim B-type star plus black hole (B+BH) binary or a Be star plus an inflated stripped star (Be+Bstr) binary. The latter hypothesis contingent upon the detection and characterization of the hidden broad-lined star in a composite optical spectrum.
Aims: Our study is aimed at tes…
Fragmentation and kinematics in high-mass star formation. CORE-extension targeting two very young high-mass star-forming regions
Henning, Th.; Beuther, H.; Klaassen, P. +24 more
Context. The formation of high-mass star-forming regions from their parental gas cloud and the subsequent fragmentation processes lie at the heart of star formation research.
Aims: We aim to study the dynamical and fragmentation properties at very early evolutionary stages of high-mass star formation.
Methods: Employing the NOrthern Exte…
Solar energetic particle heavy ion properties in the widespread event of 2020 November 29
Kulkarni, S. R.; Mitchell, D. G.; McComas, D. J. +57 more
Context. Following a multi-year minimum of solar activity, a solar energetic particle event on 2020 Nov. 29 was observed by multiple spacecraft covering a wide range of solar longitudes including ACE, the Solar Terrestrial Relations Observatory-A, and the recently launched Parker Solar Probe and Solar Orbiter.
Aims: Multi-point observations o…
Weighing the Galactic disk in sub-regions of the solar neighbourhood using Gaia DR2
Monari, G.; de Salas, P. F.; Widmark, A.
Aims: We infer the gravitational potential of the Galactic disk by analysing the phase-space densities of 120 stellar samples in 40 spatially separate sub-regions of the solar neighbourhood, using Gaia's second data release (DR2), in order to quantify spatially dependent systematic effects that bias this type of measurement.
Methods: The…
Variable stars in the VVV globular clusters. II. NGC 6441, NGC 6569, NGC 6626 (M 28), NGC 6656 (M 22), 2MASS-GC 02, and Terzan 10
Carballo-Bello, Julio A.; Smith, Leigh C.; Minniti, Dante +18 more
Context. The Galactic globular clusters (GGCs) located in the inner regions of the Milky Way suffer from high extinction that makes their observation challenging. High densities of field stars in their surroundings complicate their study even more. The VISTA Variables in the Via Lactea (VVV) survey provides a way to explore these GGCs in the near-…