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Dynamical modelling of the twisted galaxy PGC 046832
Brinchmann, Jarle; Krajnović, Davor; Emsellem, Eric +2 more
We analyse VLT/MUSE observations of PGC 046832, the brightest cluster galaxy of Abell 3556. The velocity structure of this galaxy is startling and shows two reversals in sign along the minor axis, and one along the major axis. We use triaxial Schwarzschild models to infer the intrinsic shape, central black hole mass, and orbit distribution of this…
Simulating the Solar Minimum Corona in UV Wavelengths with Forward Modeling II. Doppler Dimming and Microscopic Anisotropy Effect
Susino, Roberto; Fineschi, Silvano; Cranmer, Steven R. +5 more
In ultraviolet (UV) spectropolarimetric observations of the solar corona, the existence of a magnetic field, solar wind velocity, and temperature anisotropies modify the linear polarization associated with resonant scattering. Unlike previous empirical models or global models, which present blended results of the above physical effects, in this wo…
Active Region Contributions to the Solar Wind over Multiple Solar Cycles
van Driel-Gesztelyi, Lidia; Green, Lucie M.; Horbury, Timothy S. +1 more
Both coronal holes and active regions are source regions of the solar wind. The distribution of these coronal structures across both space and time is well known, but it is unclear how much each source contributes to the solar wind. In this study we use photospheric magnetic field maps observed over the past four solar cycles to estimate what frac…
Relationship between three-dimensional velocity of filament eruptions and CME association
Ichimoto, Kiyoshi; Ishii, Takako T.; Asai, Ayumi +2 more
It is widely recognised that filament disappearances or eruptions are frequently associated with Coronal Mass Ejections (CMEs). Since CMEs are a major source of disturbances of the space environment surrounding the Earth, it is important to investigate these associations in detail for the better prediction of CME occurrence. However, the proportio…
Modeling Solar Wind Variations over an 11 Year Cycle with Alfvén Wave Dissipation: A Parameter Study
Réville, Victor; Hazra, Soumitra; Strugarek, Antoine +3 more
We study the behavior and properties of the solar wind using a 2.5D Alfvén wave (AW)-driven wind model. We first systematically compare the results of an AW-driven wind model with a polytropic approach. Polytropic magnetohydrodynamic wind models are thermally driven, while AWs act as additional acceleration and heating mechanisms in the AW-driven …
Orbital and physical parameters of eclipsing binaries from the ASAS catalogue - XI. CHIRON investigation of long-period binaries
Smith, A. M. S.; Anderson, D. R.; Hellier, C. +8 more
We present the results of a spectroscopic campaign on eclipsing binaries with long orbital period (P = 20-75 d) carried out with the CHIRON spectrograph. Physical and orbital solutions for seven systems were derived from the V band, and I band ASAS, WASP, and TESS photometry, while radial velocities were calculated from high-quality optical spectr…
An Intermediate-age Alpha-rich Galactic Population in K2
García, Rafael A.; Stello, Dennis; Beaton, Rachael L. +9 more
We explore the relationships between the chemistry, ages, and locations of stars in the Galaxy using asteroseismic data from the K2 mission and spectroscopic data from the Apache Point Galactic Evolution Experiment survey. Previous studies have used giant stars in the Kepler field to map the relationship between the chemical composition and the ag…
MeerCRAB: MeerLICHT classification of real and bogus transients using deep learning
Paterson, Kerry; Körding, Elmar; Woudt, Patrick +13 more
Astronomers require efficient automated detection and classification pipelines when conducting large-scale surveys of the (optical) sky for variable and transient sources. Such pipelines are fundamentally important, as they permit rapid follow-up and analysis of those detections most likely to be of scientific value. We therefore present a deep le…
A Long Stream of Metal-poor Cool Gas around a Massive Starburst Galaxy at z = 2.67
Cooray, A.; Fu, Hai; Prochaska, J. X. +5 more
We present the first detailed dissection of the circumgalactic medium (CGM) of massive starburst galaxies at z > 2. Our target is a submillimeter galaxy (SMG) at z = 2.674 that has a star formation rate of 1200 M⊙ yr-1 and a molecular gas reservoir of 1.3 × 1011 M⊙. We characterize its CGM with two ba…
A random forest-based selection of optically variable AGN in the VST-COSMOS field
Bauer, F. E.; Brandt, W. N.; Vaccari, M. +6 more
Context. The survey of the COSMOS field by the VLT Survey Telescope is an appealing testing ground for variability studies of active galactic nuclei (AGN). With 54 r-band visits over 3.3 yr and a single-visit depth of 24.6 r-band mag, the dataset is also particularly interesting in the context of performance forecasting for the Vera C. Rubin Obser…